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X-Ray Diffraction Table |
See Help on X-Ray Diffraction.
Powder X-ray Diffraction (XRD) is one of the primary techniques used by mineralogists and solid state chemists to examine the physico-chemical make-up of unknown materials. This data is represented in a collection of single-phase X-ray powder diffraction patterns for the three most intense D values in the form of tables of interplanar spacings (D), relative intensities (I/Io), mineral name and chemical formulae
The XRD technique takes a sample of the material and places a powdered sample in a holder, then the sample is illuminated with x-rays of a fixed wave-length and the intensity of the reflected radiation is recorded using a goniometer. This data is then analyzed for the reflection angle to calculate the inter-atomic spacing (D value in Angstrom units - 10-8 cm). The intensity(I) is measured to discriminate (using I ratios) the various D spacings and the results are compared to this table to identify possible matches. Note: 2 theta (Θ) angle calculated from the Bragg Equation, 2 Θ = 2(arcsin(n λ/(2d)) where n=1
For more information about this technique, see X-Ray Analysis of a Solid or take an internet course at Birkbeck College On-line Courses. Many thanks to Frederic Biret for these data.
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D1 Å (2θ) |
I1 %) |
D2 Å (2θ) |
I2 (%) |
D3 Å (2θ) |
I3 (%) |
Mineral | Formula |
2.598(34.49) | 200 | 4.326(20.51) | 200 | 3.058(29.18) | 160 | Khamrabaevite | (Ti,V,Fe)C |
2.612(34.30) | 200 | 9.240(9.56) | 200 | 32.000(2.76) | 200 | Perlialite | K8Tl4Al12Si24O72ยท20(H2O) |
2.662(33.64) | 200 | 6.140(14.41) | 200 | 3.768(23.59) | 160 | Maikainite | Cu20(Fe,Cu)6Mo2Ge6S32 |
2.669(33.55) | 200 | 4.486(19.77) | 180 | 7.032(12.58) | 180 | Baotite | Ba4(Ti,Nb)8Si4O28Cl |
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