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JY/T 0587-2020: General rules for X-ray polycrystalline diffractometry---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/JYT0587-2020
EDUCATION INDUSTRY STANDARD
ICS 03.180
Y 51
Replacing JY/T 009-1996
General rules for X-ray polycrystalline diffractometry
Issued on. SEPTEMBER 29, 2020
Implemented on. DECEMBER 01, 2020
Issued by. Ministry of Education of PRC
Table of Contents
Foreword... 4
1 Scope... 6
2 Normative references... 6
3 Terms and definitions... 6
4 Principles of analysis methods... 11
4.1 Qualitative analysis of phases... 11
4.2 Quantitative analysis of phase... 12
4.3 Determination of grain size and lattice distortion... 13
4.4 Determination of unit cell parameters of cubic crystals... 15
4.5 Solving the crystal structure from ab initio polycrystalline diffraction data... 16
4.6 High and low temperature diffraction... 16
5 Reagents and materials... 17
5.1 Standard material... 17
5.2 Organic solvents... 17
5.3 Sieves... 17
5.4 Sample preparation tools... 17
5.5 Microscope... 17
5.6 Specimen plate... 17
6 Instruments... 18
6.1 Composition of the instrument... 18
6.2 Verification or calibration... 18
7 Samples... 19
7.1 Pretreatment of samples... 19
7.2 Filling of the specimen plate... 19
7.3 Judge whether the specimen plate is available... 20
8 Analysis steps... 20
8.1 Startup and parameter setting of the instrument... 20
8.2 Steps of phase qualitative analysis... 21
8.3 Steps for phase quantitative analysis... 23
8.4 Determination of grain size and lattice distortion by linewidth method... 24
8.5 Procedure for determination of unit cell parameters of cubic crystals... 25
8.6 Analysis steps for solving crystal structure by ab initio polycrystalline diffraction data
... 26
8.7 High temperature and low temperature polycrystalline diffraction... 27
8.8 Crystallinity analysis procedure... 28
8.9 Inspection after determination... 29
9 Results report... 29
9.1 Basic information... 29
9.2 Presentation of analysis results... 29
10 Safety precautions... 30
10.1 X-ray protection... 30
10.2 Water and electricity safety protection... 30
10.3 Safety protection for experiment personal... 30
Appendix A (Informative) PDF descriptions... 32
Appendix B (Informative) Various standard materials and standard data... 36
Appendix C (Informative) Calibration of diffraction peak positions (2θ)... 40
Appendix D (Informative) Crystallinity analysis method... 44
References... 48
1 Scope
This standard specifies the analysis method principles, reagents and materials,
instruments, samples, analysis steps, result reports, safety precautions, for using
polycrystalline X-ray diffractometers, to analyze the phase composition of various
polycrystalline materials.
This standard applies to conventional polycrystal X-ray diffractometers. X-ray
diffractometers, which are equipped with two-dimensional surface detectors, can refer
to this method.
2 Normative references
The following documents are essential for the application of this document. For dated
references, only the dated version applies to this document. For undated references, the
latest edition (including all amendments) applies to this document.
GB/T 13869-2008 General guide for safety of electric user
GB 18871-2002 Basic standards for protection against ionizing radiation and for the
safety of radiation sources
JY/T 009-1996 General rules for X-ray polycrystalline diffractometry
3 Terms and definitions
The terms and definitions, which are defined in JY/T 009-1996, as well as the following
terms and definitions, apply to this document.
3.1
X-ray
Electromagnetic waves, which have wavelengths from 10-3 nm to 10 nm.
Note. The X-ray wavelength, which is used for crystal diffraction, is 0.05 nm ~ 0.25 nm.
3.2
Crystal
A generalized crystal is a solid, which has a definite diffraction pattern. Its atoms,
molecules or ions are arranged in the space a highly ordered manner, according to
certain rules, including traditional periodic crystals and non-periodic crystals.
3.3
Polycrystal
A solid powder or bulk object, which is formed by agglomeration of many small
grains. It is also known as polycrystalline material.
3.4
Space lattice
In crystallography, the tool used to express the periodic arrangement of structural
units in a crystal, which is a collection of periodically repeating points in three-
dimensional space.
3.5
Unit cell
The smallest building unit, in which atoms, molecules or ions are regularly arranged,
in long-range order, in three-dimensional space. Its shape is a parallelepiped.
4 Principles of analysis methods
4.1 Qualitative analysis of phases
The process, according to the X-ray diffraction pattern (peak position, intensity, element
composition) of the sample to be analyzed, to search and match with the powder
diffraction database, to compare and analyze to determine its phase composition.
4.2 Quantitative analysis of phase
4.2.1 Basic formulas for quantitative phase analysis
The diffraction spectrum of the polycrystalline mixture of different phases is the
superposition of the weight (scale factor) of the diffraction spectrum of each constituent
phase. The diffraction intensity (referring to the full spectrum intensity) of each
constituent phase is affected by other phases (referring to the total mass absorption
coefficient),
4.3.2 Relationship between lattice distortion or micro-strain and diffraction line
width
4.4 Determination of unit cell parameters of cubic crystals
4.4.1 The relationship between the unit cell parameters of the cubic material and
the Bragg angle θhkl of a certain hkl diffraction
The relationship, between the unit cell parameters of the cubic material and the Bragg
angle θhkl of a certain hkl diffraction, is.
5 Reagents and materials
5.1 Standard material
The most commonly used is silicon powder; the purity is better than 99.999%; the
particle size is between 5 μm and 30 μm; the crystal is perfect; there is no residual stress
and too many defects. Silica powder is suitable for the range of 2θ > 29°.
5.4 Sample preparation tools
Microscope slides, flat glass, agate mortars, clips and other sample preparation supplies.
5.5 Microscope
An optical microscope, which is used to observe the uniform particle size of the sample
AND determine whether the specimen plate is flat.
5.6 Specimen plate
Specimen plates without backing, such as hollow aluminum specimen plate, grooved
glass specimen plate, single crystal silica, or porous material.
6 Instruments
6.1 Composition of the instrument
6.1.1 Structure diagram
Polycrystalline X-ray diffractometer mainly consists of four parts. X-ray generator,
Bragg-Brentano goniometer (vertical or horizontal), detection and recording system,
control and data processing system. Its structure diagram is as shown in Figure 1.
6.2 Verification or calibration
Before the equipment is put into use, it shall verify and calibrate, in a planned manner,
the equipment that has a significant impact on the accuracy or validity of the detection
and analysis results, including auxiliary measurement equipment used to measure
environmental conditions, etc., to determine whether it meets the requirements of
detection and analysis.
7 Samples
7.1 Pretreatment of samples
The pretreatment of the sample includes grinding, polishing, etc. Equipment for
grinding samples includes pulverizers, ball mills, mortars, etc. Different grinding
equipment and accessories are selected, according to the hardness of the analyzed
specimen AND the influence of impurities that may be introduced.
7.1.1 Grinding
7.1.3 Judging whether the mixture is uniform
Take specimens, which have different mixing times, to perform diffraction scanning. If
the obtained spectrum is basically the same, it means that the mixing is uniform. If the
diffraction intensity of different phases, on the obtained spectrum, changes greatly, it
means that the mixing is not uniform, AND it is necessary to continue mixing.
7.2 Filling of the specimen plate
7.2.1 Usually, use a grooved specimen plate. Evenly fill the specimen in the groove.
The surface of the specimen is slightly higher than the surface of the specimen plate.
Use a glass slide to press the specimen tightly, so that the surface of the specimen and
the surface of the specimen plate are on the same plane.
7.3 Judge whether the specimen plate is available
Quickly scan the specimen plate. If the diffraction line intensity sequence of each
substance is similar to that listed in the PDF card, it means that there is no serious
preferred orientation, so this specimen plate is available. Otherwise, the specimen plate
shall be refilled.
8 Analysis steps
8.1 Startup and parameter setting of the instrument
8.1.1 Power on
Start the instrument, according to the instrument operating procedures.
8.1.2 Setting of instrument parameters
8.1.2.4 Scan mode and scan speed
There are two common scanning methods. continue scanning and step scanning.
Scanning speed refers to the angular speed, at which the receiving slit (RS) and the
detector rotate uniformly, on the goniometer, in °/min. Increasing the scanning speed
can save test time, BUT will result in a decrease in intensity and resolution.
8.2 Steps of phase qualitative analysis
8.2.1 Preparation before measurement
8.2.1.1 Power on and instrument calibration
Start the instrument, according to the provisions of 8.1.Set the parameters. Determine
whether the instrument is verified or calibrated, according to the provisions of 6.2.
8.2.1.2 Specimen preparation
Prepare specimens, according to the relevant provisions in Chapter 7.
8.2.2 Determination
8.2.4 Spectrum analysis
8.2.4.1 Retrieving the phase contained in the matching specimen
Use PDF or CCDC index for automatic computer retrieval or manual retrieval, to find
out possible diffraction cards or other patterns of known phases. Make careful
comparison; finally determine the phase contained in the specimen.
8.2.4.2 Reducing influencing factors
During the analysis, attention shall be paid to the large shift of the d value or the relative
intensity data, due to the influence of the solid solution phenomenon, the overlapping
peaks of the mixture, the preferred orientation, etc. If there is an obvious preferred
orientation, consideration shall be given to re-preparing the specimen OR using a
rotating specimen stage, during the measurement, to reduce its influence.
8.2.4.5 Analyzing trace phases in the specimen
If the specimen contains trace phase, it is best to obtain the trace phase single-phase
sample by extraction and enrichment method; conduct phase analysis on it. If extraction
is impossible, it may use the methods, such as increasing the radiation power or
extending the data collection time, to make the specimen appear as 3 or more diffraction
lines as possible, to carry out the phase analysis.
8.3 Steps for phase quantitative analysis
8.3.1 Preparation before determination
8.3.3.2 Modeling
Transfer the diffraction spectrum into the Rietveld full spectrum fitting software. Input
the crystal structure model, peak shape model, texture model, background model of the
diffraction spectrum, of each constituent phase.
8.3.3.3 Refinement
Rietveld full spectrum fitting refinement.
8.4 Determination of grain size and lattice distortion by linewidth
method
8.4.1 Preparation before determination
8.4.2 Determination
Scan the sample for testing. If the intensity of the diffraction peak is lower than 1 x 104
counts, THEN, the dwell time in each step shall be appropriately extended.
8.4.3 Spectral processing
8.4.3.1 Selection of diffraction peaks and calculation of full width at half maximum
of peak profile
Test the linewidth B of each diffraction line of the standard sample AND each
diffraction line of the sample to be tested.
8.4.3.2 Calculation of βa and βd
By separating the linewidths of diffraction lines and removing the influence of
instrument broadening, the grain broadening βa and lattice distortion broadening βd are
obtained, respectively.
the operating procedures of the instrument.
9 Results report
9.1 Basic information
For any determinations, which are specified in this standard, the result report shall at
least include. information on the entrusting organization, sample information,
equipment information, environmental conditions, testing method (standard), testing
person, testing date, etc.
9.2 Presentation of analysis results
List the results obtained and the relative errors. For the analysis results given, it shall
describe the measurement method used and the actual treatment process. List the
standard samples used and their proportions.
JY/T 0587-2020
EDUCATION INDUSTRY STANDARD
ICS 03.180
Y 51
Replacing JY/T 009-1996
General rules for X-ray polycrystalline diffractometry
Issued on. SEPTEMBER 29, 2020
Implemented on. DECEMBER 01, 2020
Issued by. Ministry of Education of PRC
Table of Contents
Foreword... 4
1 Scope... 6
2 Normative references... 6
3 Terms and definitions... 6
4 Principles of analysis methods... 11
4.1 Qualitative analysis of phases... 11
4.2 Quantitative analysis of phase... 12
4.3 Determination of grain size and lattice distortion... 13
4.4 Determination of unit cell parameters of cubic crystals... 15
4.5 Solving the crystal structure from ab initio polycrystalline diffraction data... 16
4.6 High and low temperature diffraction... 16
5 Reagents and materials... 17
5.1 Standard material... 17
5.2 Organic solvents... 17
5.3 Sieves... 17
5.4 Sample preparation tools... 17
5.5 Microscope... 17
5.6 Specimen plate... 17
6 Instruments... 18
6.1 Composition of the instrument... 18
6.2 Verification or calibration... 18
7 Samples... 19
7.1 Pretreatment of samples... 19
7.2 Filling of the specimen plate... 19
7.3 Judge whether the specimen plate is available... 20
8 Analysis steps... 20
8.1 Startup and parameter setting of the instrument... 20
8.2 Steps of phase qualitative analysis... 21
8.3 Steps for phase quantitative analysis... 23
8.4 Determination of grain size and lattice distortion by linewidth method... 24
8.5 Procedure for determination of unit cell parameters of cubic crystals... 25
8.6 Analysis steps for solving crystal structure by ab initio polycrystalline diffraction data
... 26
8.7 High temperature and low temperature polycrystalline diffraction... 27
8.8 Crystallinity analysis procedure... 28
8.9 Inspection after determination... 29
9 Results report... 29
9.1 Basic information... 29
9.2 Presentation of analysis results... 29
10 Safety precautions... 30
10.1 X-ray protection... 30
10.2 Water and electricity safety protection... 30
10.3 Safety protection for experiment personal... 30
Appendix A (Informative) PDF descriptions... 32
Appendix B (Informative) Various standard materials and standard data... 36
Appendix C (Informative) Calibration of diffraction peak positions (2θ)... 40
Appendix D (Informative) Crystallinity analysis method... 44
References... 48
1 Scope
This standard specifies the analysis method principles, reagents and materials,
instruments, samples, analysis steps, result reports, safety precautions, for using
polycrystalline X-ray diffractometers, to analyze the phase composition of various
polycrystalline materials.
This standard applies to conventional polycrystal X-ray diffractometers. X-ray
diffractometers, which are equipped with two-dimensional surface detectors, can refer
to this method.
2 Normative references
The following documents are essential for the application of this document. For dated
references, only the dated version applies to this document. For undated references, the
latest edition (including all amendments) applies to this document.
GB/T 13869-2008 General guide for safety of electric user
GB 18871-2002 Basic standards for protection against ionizing radiation and for the
safety of radiation sources
JY/T 009-1996 General rules for X-ray polycrystalline diffractometry
3 Terms and definitions
The terms and definitions, which are defined in JY/T 009-1996, as well as the following
terms and definitions, apply to this document.
3.1
X-ray
Electromagnetic waves, which have wavelengths from 10-3 nm to 10 nm.
Note. The X-ray wavelength, which is used for crystal diffraction, is 0.05 nm ~ 0.25 nm.
3.2
Crystal
A generalized crystal is a solid, which has a definite diffraction pattern. Its atoms,
molecules or ions are arranged in the space a highly ordered manner, according to
certain rules, including traditional periodic crystals and non-periodic crystals.
3.3
Polycrystal
A solid powder or bulk object, which is formed by agglomeration of many small
grains. It is also known as polycrystalline material.
3.4
Space lattice
In crystallography, the tool used to express the periodic arrangement of structural
units in a crystal, which is a collection of periodically repeating points in three-
dimensional space.
3.5
Unit cell
The smallest building unit, in which atoms, molecules or ions are regularly arranged,
in long-range order, in three-dimensional space. Its shape is a parallelepiped.
4 Principles of analysis methods
4.1 Qualitative analysis of phases
The process, according to the X-ray diffraction pattern (peak position, intensity, element
composition) of the sample to be analyzed, to search and match with the powder
diffraction database, to compare and analyze to determine its phase composition.
4.2 Quantitative analysis of phase
4.2.1 Basic formulas for quantitative phase analysis
The diffraction spectrum of the polycrystalline mixture of different phases is the
superposition of the weight (scale factor) of the diffraction spectrum of each constituent
phase. The diffraction intensity (referring to the full spectrum intensity) of each
constituent phase is affected by other phases (referring to the total mass absorption
coefficient),
4.3.2 Relationship between lattice distortion or micro-strain and diffraction line
width
4.4 Determination of unit cell parameters of cubic crystals
4.4.1 The relationship between the unit cell parameters of the cubic material and
the Bragg angle θhkl of a certain hkl diffraction
The relationship, between the unit cell parameters of the cubic material and the Bragg
angle θhkl of a certain hkl diffraction, is.
5 Reagents and materials
5.1 Standard material
The most commonly used is silicon powder; the purity is better than 99.999%; the
particle size is between 5 μm and 30 μm; the crystal is perfect; there is no residual stress
and too many defects. Silica powder is suitable for the range of 2θ > 29°.
5.4 Sample preparation tools
Microscope slides, flat glass, agate mortars, clips and other sample preparation supplies.
5.5 Microscope
An optical microscope, which is used to observe the uniform particle size of the sample
AND determine whether the specimen plate is flat.
5.6 Specimen plate
Specimen plates without backing, such as hollow aluminum specimen plate, grooved
glass specimen plate, single crystal silica, or porous material.
6 Instruments
6.1 Composition of the instrument
6.1.1 Structure diagram
Polycrystalline X-ray diffractometer mainly consists of four parts. X-ray generator,
Bragg-Brentano goniometer (vertical or horizontal), detection and recording system,
control and data processing system. Its structure diagram is as shown in Figure 1.
6.2 Verification or calibration
Before the equipment is put into use, it shall verify and calibrate, in a planned manner,
the equipment that has a significant impact on the accuracy or validity of the detection
and analysis results, including auxiliary measurement equipment used to measure
environmental conditions, etc., to determine whether it meets the requirements of
detection and analysis.
7 Samples
7.1 Pretreatment of samples
The pretreatment of the sample includes grinding, polishing, etc. Equipment for
grinding samples includes pulverizers, ball mills, mortars, etc. Different grinding
equipment and accessories are selected, according to the hardness of the analyzed
specimen AND the influence of impurities that may be introduced.
7.1.1 Grinding
7.1.3 Judging whether the mixture is uniform
Take specimens, which have different mixing times, to perform diffraction scanning. If
the obtained spectrum is basically the same, it means that the mixing is uniform. If the
diffraction intensity of different phases, on the obtained spectrum, changes greatly, it
means that the mixing is not uniform, AND it is necessary to continue mixing.
7.2 Filling of the specimen plate
7.2.1 Usually, use a grooved specimen plate. Evenly fill the specimen in the groove.
The surface of the specimen is slightly higher than the surface of the specimen plate.
Use a glass slide to press the specimen tightly, so that the surface of the specimen and
the surface of the specimen plate are on the same plane.
7.3 Judge whether the specimen plate is available
Quickly scan the specimen plate. If the diffraction line intensity sequence of each
substance is similar to that listed in the PDF card, it means that there is no serious
preferred orientation, so this specimen plate is available. Otherwise, the specimen plate
shall be refilled.
8 Analysis steps
8.1 Startup and parameter setting of the instrument
8.1.1 Power on
Start the instrument, according to the instrument operating procedures.
8.1.2 Setting of instrument parameters
8.1.2.4 Scan mode and scan speed
There are two common scanning methods. continue scanning and step scanning.
Scanning speed refers to the angular speed, at which the receiving slit (RS) and the
detector rotate uniformly, on the goniometer, in °/min. Increasing the scanning speed
can save test time, BUT will result in a decrease in intensity and resolution.
8.2 Steps of phase qualitative analysis
8.2.1 Preparation before measurement
8.2.1.1 Power on and instrument calibration
Start the instrument, according to the provisions of 8.1.Set the parameters. Determine
whether the instrument is verified or calibrated, according to the provisions of 6.2.
8.2.1.2 Specimen preparation
Prepare specimens, according to the relevant provisions in Chapter 7.
8.2.2 Determination
8.2.4 Spectrum analysis
8.2.4.1 Retrieving the phase contained in the matching specimen
Use PDF or CCDC index for automatic computer retrieval or manual retrieval, to find
out possible diffraction cards or other patterns of known phases. Make careful
comparison; finally determine the phase contained in the specimen.
8.2.4.2 Reducing influencing factors
During the analysis, attention shall be paid to the large shift of the d value or the relative
intensity data, due to the influence of the solid solution phenomenon, the overlapping
peaks of the mixture, the preferred orientation, etc. If there is an obvious preferred
orientation, consideration shall be given to re-preparing the specimen OR using a
rotating specimen stage, during the measurement, to reduce its influence.
8.2.4.5 Analyzing trace phases in the specimen
If the specimen contains trace phase, it is best to obtain the trace phase single-phase
sample by extraction and enrichment method; conduct phase analysis on it. If extraction
is impossible, it may use the methods, such as increasing the radiation power or
extending the data collection time, to make the specimen appear as 3 or more diffraction
lines as possible, to carry out the phase analysis.
8.3 Steps for phase quantitative analysis
8.3.1 Preparation before determination
8.3.3.2 Modeling
Transfer the diffraction spectrum into the Rietveld full spectrum fitting software. Input
the crystal structure model, peak shape model, texture model, background model of the
diffraction spectrum, of each constituent phase.
8.3.3.3 Refinement
Rietveld full spectrum fitting refinement.
8.4 Determination of grain size and lattice distortion by linewidth
method
8.4.1 Preparation before determination
8.4.2 Determination
Scan the sample for testing. If the intensity of the diffraction peak is lower than 1 x 104
counts, THEN, the dwell time in each step shall be appropriately extended.
8.4.3 Spectral processing
8.4.3.1 Selection of diffraction peaks and calculation of full width at half maximum
of peak profile
Test the linewidth B of each diffraction line of the standard sample AND each
diffraction line of the sample to be tested.
8.4.3.2 Calculation of βa and βd
By separating the linewidths of diffraction lines and removing the influence of
instrument broadening, the grain broadening βa and lattice distortion broadening βd are
obtained, respectively.
the operating procedures of the instrument.
9 Results report
9.1 Basic information
For any determinations, which are specified in this standard, the result report shall at
least include. information on the entrusting organization, sample information,
equipment information, environmental conditions, testing method (standard), testing
person, testing date, etc.
9.2 Presentation of analysis results
List the results obtained and the relative errors. For the analysis results given, it shall
describe the measurement method used and the actual treatment process. List the
standard samples used and their proportions.
...... Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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