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X-ray powder diffraction technique and the Rietveld refinement method have been used successfully for the qualitative and quantitative analyses of Pingguo bauxite from Guangxi, China. Qualitative phase analysis shows that the Pingguo bauxite contains diaspore (AlOOH), hematite (Fe2O3), goethite (FeOOH), anatase (TiO2), and kaolinite (Al2(Si2O5)(OH)4). Quantitative Rietveld refinement shows that the weight concentrations of diaspore, goethite, hematite, anatase, and kaolinite for the Pingguo bauxite are 71.9(4)%, 7.0(8)%, 11.3(7)%, 6.5(6)%, and 3.3(9)%, respectively.

Equilibria E 4000The 773 K Isothermal Section of the Nd-Fe-Sb Ternary System. -The study of the 773 K isothermal section of the phase diagram of the title system leads to the detection of two new ternary compounds, NdFeSb3 and NdFe2.5Sb2. As revealed by powder XRD, NdFeSb3 crystallizes in the orthorhombic space group Pbcm (CeNiSb3-type structure). The existence of the compounds Nd6Fe13Sb, NdFe1-xSb2, and NdFe4Sb12 is confirmed. -(ZENG*, L.; QIN, P.; NONG, L.; ZHANG, J.; LIAO, J.;