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 |
3.174(28.09) | 200 | 3.680(24.16) | 200 | 6.080(14.56) | 200 | Cesstibtantite | (Cs,Na)SbTa4O12 |
3.180(28.04) | 200 | 3.600(24.71) | 200 | 4.260(20.83) | 200 | Lindsleyite | (Ba,Sr)(Ti,Cr,Fe,Mg)21O38 |
3.212(27.75) | 5.802(15.26) | 6.828(12.95) | Dessauite | (Sr,Pb)(Y,U)(Ti,Fe+++)20O38 | |||
3.218(27.70) | 200 | 6.318(14.01) | 200 | 5.266(16.82) | 160 | Cobaltaustinite | CaCo(AsO4)(OH) |
3.220(27.68) | 200 | 5.040(17.58) | 200 | 5.900(15.00) | 200 | Maghemite | gamma-Fe+++2O3 |
3.236(27.54) | 200 | 3.746(23.73) | 200 | 5.290(16.75) | 200 | Zavaritskite | BiOF |
3.240(27.51) | 200 | 5.420(16.34) | 200 | 6.060(14.61) | 160 | Hibschite | Ca3Al2(SiO4)3-x(OH)4x(x=0.2-1.5) |
3.240(27.51) | 200 | 4.280(20.74) | 200 | 5.900(15.00) | 200 | Bismutite | Bi2(CO3)O2 |
3.250(27.42) | 200 | 4.280(20.74) | 200 | 4.204(21.12) | 120 | Pseudosinhalite | Mg2Al3B2O9(OH) |
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