Powder diffraction sample preparation method for reducing preferred orientation effect
A technology of powder diffraction and powder, which is applied in the field of powder diffraction sample preparation to reduce the effect of preferred orientation, can solve the problem that the preferred orientation cannot be completely overcome, and achieve the effect of uniform distribution of preferred orientation, good repeatability, and reduced error
Inactive Publication Date: 2012-07-11
JIANGXI UNIV OF SCI & TECH
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Problems solved by technology
In actual production and scientific research, traditional methods cannot completely overcome the problem of preference orientation
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[0016] The present invention will be further described below in combination with specific embodiments. This embodiment is only used to illustrate the present invention rather than limit the scope of the present invention.
[0017] Preparation of Nd 2 co 6 For the alloy sample with Fe chemical formula composition, take about 200mg sample and put it into an agate crucible to grind for more than 3 hours, and add absolute alcohol for protection during grinding. The ground powder was air-dried and passed through a 600-mesh sieve to ensure that the particle size of the obtained powder was less than 10 μm. The teachings of the present invention were then applied to this powder sample. The obtained X-ray diffraction pattern was refined with any Rieveld refinement software, and the background intensity was not fitted with a polynomial, but subtracted by manual input.
[0018] Table 1. Comparison of the present embodiment and comparative examples.
[0019]
[0020] The diffract...
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The present invention provides a powder sample preparation method which is applied to a powder diffraction experiment using Bragg-Brentano diffraction geometry. According to the method, the diffracted intensity data of the powder diffraction can be collected accurately for processing accurate phase identification, quantitative phase analysis, lattice constant determination and crystal structure refinement. The method includes a series of steps, which is characterized in that the powder falls on a viscous surface for preparing the experimental sample by utilizing the self weight of the finely pulverized powder. The method also is characterized in that the powder diffraction sample prepared by the method has diffraction spectral lines with a good repeatability. The method can furthest reduce preferred orientation of the sample in the powder diffraction experiment, the preferred orientation can result in deviations of diffraction peak intensity, diffraction peak shape and diffraction peak position, and the inaccurate diffraction data can result in inaccurate analysis results.
Description
technical field [0001] The invention relates to a sample preparation method for powder diffraction experiments, which is suitable for diffraction experiments using Bragg-Brentano diffraction geometry. The method involved in the present invention can effectively reduce the preferred orientation effect of powder samples in diffraction experiments, effectively solve the problem of poor repeatability of spectral lines of flake and needle-shaped powder samples, and is especially suitable for quantification by using powder diffraction spectral lines The field of phase analysis and crystal structure elucidation and refinement. Background technique [0002] The basic principle of powder diffraction requires: a beam of monochromatic rays is incident on a large number of small crystals with completely arbitrary orientations. Since the orientation of the small crystals is arbitrary, the diffraction lines of each group (hkl) lattice plane form a corresponding A conical surface whose ax...
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IPC IPC(8): G01N1/28
Inventor 不公告发明人
Owner JIANGXI UNIV OF SCI & TECH