Notifications
X-ray diffraction operation experimental sample preparation requirements are as follows:
1. Metal samples such as block, plate, and round shape are required to be ground into a plane with an area of not less than 15x20 mm. If the area is too small, it can be pasted together with several pieces.
2. For sheet-like and round-shaped samples, there will be a serious preferred orientation, and the diffraction intensity is abnormal. Therefore, it is required to select the corresponding direction plane reasonably during the test.
3. For measuring the microscopic stress (lattice distortion) of the metal sample, measuring the retained austenite requires that the sample cannot be simply coarsely ground, and it is required to prepare a metallographic sample, and perform ordinary polishing or electrolytic polishing to eliminate the surface strain layer.
4. The powder sample is required to be ground to a particle size of -320 mesh, about 40 microns. The particle size is coarse and the diffraction intensity is low, the peak shape is not good, and the resolution is low. To understand the physicochemical properties of the sample, such as whether it is flammable, deliquescent, corrosive, toxic, volatile.
5. The powder sample is required to be around 3 grams, and if it is too small, it needs 5 milligrams.
6. The sample may be a metal, non-metallic, organic, inorganic material powder.
7. All kinds of raw materials used for research topics must be identified, such as material formula, crystal form, crystallinity, particle size and so on. In order to avoid using the wrong raw materials.
8. For film samples of different substrates, it is necessary to understand the orientation of the substrate by inspection. The lower limit of the film thickness measured by X-ray is about 20 nm.
9. For the fiber sample test, the direction of the test fiber should be raised, whether it is parallel or vertical, because the diffraction intensity is different.
10. For welding materials, such as fracture and weld surface diffraction analysis, the fracture is required to be relatively flat, providing the elements contained in the fracture. If the area of a fracture is small, it can be combined with two or three fractures.
11. For special samples, it is possible to discuss and propose an experimental scheme for x-ray diffraction operation.
12. It is required to have the analytical and analytical ability of material x-ray diffraction operation data, and can independently identify the reference PDF card standard diffraction data. A PDF database is available from the laboratory.
13. X-ray diffraction technology can analyze metal solid solution, alloy phase structure, oxide phase synthesis, material crystallization state, metal alloying, metal alloy film and orientation, weld metal phase, crystallinity, crystal structure inspection of raw materials, metal Oxidation, phase transformation of various ceramics and alloys, determination of lattice parameters, amorphous structure, particle size of nanomaterials, structure of mineral raw materials, phase analysis of building materials, analysis of cement phase.
14. X-ray diffraction operation technology of non-metallic materials can analyze material synthesis structure, oxide solid phase transformation, electrochemical material structure change, nano material doping, catalyst material doping, crystal material structure, metal non-metal oxide film, Various deposits, volatiles, chemical products, oxide film phase analysis, electroless plating phase analysis.
15. If the composition of the sample is not known, the X-ray fluorescence spectrometer can be used to determine the composition of the sample to provide component information for X-ray diffraction analysis.
16. The accuracy of the x-ray diffraction operation experiment and the quality of the information obtained by the experiment have a great relationship with the preparation of the sample. Therefore, it is desirable to properly process the sample and prepare the sample during the experiment.
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