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 |
27.600(3.20) | 200 | 9.200(9.61) | 180 | 5.340(16.59) | 140 | Molybdophyllite | Pb9Mg9Si9O24(OH)24 |
27.660(3.19) | 200 | 6.800(13.01) | 130 | 5.598(15.82) | 124 | Francoanellite | H6(K,Na)3(Al,Fe+++)5(PO4)8·13(H2O) |
27.820(3.17) | 200 | 9.700(9.11) | 180 | 7.964(11.10) | 120 | Chessexite | (K,Na)4Ca2Mg3Al8(SiO4)2(SO4)10(OH)10·40(H2O) |
27.960(3.16) | 200 | 6.912(12.80) | 140 | 9.680(9.13) | 140 | Lannonite | HCa4Mg2Al4(SO4)8F9·32(H2O) |
28.000(3.15) | 200 | 7.060(12.53) | 120 | 14.160(6.24) | 120 | Corrensite | (Ca,Na,K)(Mg,Fe,Al)9(Si,Al)8O20(OH)10·n(H2O) |
28.000(3.15) | 200 | 7.412(11.93) | 130 | 6.002(14.75) | 90 | Tobermorite | Ca5Si6O16(OH)2·4(H2O) |
28.000(3.15) | 200 | 6.020(14.70) | 160 | 7.780(11.36) | 160 | Guerinite | Ca5(AsO3OH)2(AsO4)2·9(H2O) |
28.200(3.13) | 200 | 5.580(15.87) | 120 | 6.500(13.61) | 114 | Yukonite | Ca7Fe+++11(AsO4)9O10·24.3(H2O) |
28.400(3.11) | 200 | 6.860(12.89) | 120 | 6.960(12.71) | 120 | Bariandite | Al0.6V8O20·9(H2O) |
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