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Isomorphic substitution of neodymium and gadolinium for calcium in synthetic hydroxovanadate
Authors:E I Get’man  T A Shul’gina  S N Loboda  L Carrison
Institution:(1) Donetsk National University, Donetsk, Ukraine;(2) East-Ukrainian National University, Lugansk, Ukraine;(3) Minnesota State University, Mankato, USA
Abstract:Isomorphic substitution of neodymium and gadolinium for calcium in synthetic hydroxovanadate Ca5 ? x M x (VO4)3(OH)1 ? x O x (M = Nd, Gd) is studied in the range 700–1000°C using X-ray powder diffraction, single-crystal X-ray diffraction (Rietveld technique), and IR spectroscopy. Single-phase solid solutions at 800°C are formed with x ≤ 0.35 for M(III) = Nd and x ≤ 0.3 for M(III) = Gd. With high x, the apatite solid solution coexists with Ca3(VO4)2, Nd2O3, and X phases. With increasing x in the homogeneous region, the intensity of the bands of stretching vibrations and librations of OH groups decrease. Single-crystal X-ray diffraction shows that neodymium and gadolinium substitute for calcium in solid solutions mostly in Ca(2) positions.
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