Crystallographic studies of some olivine-related (Ni,Mg)3(PO4)2 solid solutions |
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| Authors: | Anders G Nord Theodor Stefanidis |
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| Institution: | 1. Section of Mineralogy, Swedish Museum of Natural History, P.O. Box 50007, 104 05, Stockholm 50, Sweden
2. Departments of Inorganic and Structural Chemistry, Arrhenius Laboratory, University of Stockholm, 106 91, Stockholm, Sweden
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| Abstract: | Olivine-related (Ni, Mg)3(PO4)2 solid solutions were prepared and equilibrated at 1070 K. Accurate monoclinic unit cell dimensions were determined from Guinier-Hägg photographic data. Structural refinements based on the X-ray profile-fitting technique after Rietveld were carried out for pure nickel (II) orthophosphate and for three Ni/Mg solid solutions. (Ni1-x Mg x )3(PO4)2 phases with 0.40≦x≦0.60 are probably isostructural with Ni3(PO4)2 (P21/a) while phases with low magnesium contents (<27 atom % Mg) deviate structurally from Ni3(PO4)2. The results also show that Ni2+ is partially ordered at the octahedralM(1) sites, withK D (Ni, Mg)=4.0±0.2 |
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