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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 |
2.800(31.94) | 200 | 2.980(29.96) | 200 | 4.980(17.80) | 100 | Leadamalgam | HgPb2 |
2.860(31.25) | 200 | 3.240(27.51) | 200 | 5.980(14.80) | 200 | Augite | (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6 |
2.866(31.18) | 200 | 3.164(28.18) | 200 | 5.700(15.53) | 200 | Batisivite | (Ti,V,Cr)14Ba[Si2O7]O22 |
2.880(31.03) | 200 | 4.280(20.74) | 200 | 4.500(19.71) | 180 | Mathiasite | (K,Ca,Sr)(Ti,Cr,Fe,Mg)21O38 |
2.880(31.03) | 180 | 5.680(15.59) | 180 | 3.380(26.35) | 170 | Romanite | (Fe++,U,Pb)2(Ti,Fe+++)O4 |
2.900(30.81) | 200 | 4.960(17.87) | 200 | 4.086(21.73) | 180 | Bityite | CaLiAl2(AlBeSi2)O10(OH)2 |
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