On the Crystal Chemistry and Stability of Sm2+ in SmSO4 and Solid Solutions of M1-xSmxSO4 (M=Ba, Sr)
Authors: Mikhail P.; Sieber A.; Samtleben T.; Trusch B.; Lüthi T.; Hulliger J.
Source: Journal of Solid State Chemistry, Volume 154, Number 2, November 2000 , pp. 535-541(7)
Publisher: Academic Press
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Abstract:
Solid solution formation of Sm2+ and MSO4 (M=Sr, Ba) was investigated for syntheses using (i) a LiCl high-temperature solution exposed to a reducing atmosphere and (ii) precipitation reactions at room temperature starting from aqueous solutions of SmI2 or electrochemically gained Sm2+. In contrast to (ii), present results show that a high-temperature approach (i) yielded only a very low amount of Sm2+ in M1-xSmxSO4. Formation of a solid solution system (0<x<1) was confirmed for Sr1-xSmxSO4 and Ba1-xSmxSO4 by X-ray powder diffraction analysis and optical lifetime measurements. The unit cell parameters of Ba1-xSmxSO4 showed a slight deviation from Vegard's law. Positive and negative deviations are in agreement with results on solid solutions of Ba1-xSrxSO4. Compounds obtained by syntheses at room temperature were exposed to annealing at 450 to 850°C using a reducing or oxidizing atmosphere. In this temperature range, M1-xSmxSO4 (M=Sr, Ba) decomposed into Sm2O2(SO4) and the corresponding MSO4. Solid solutions of M1-xSmxSO4 (M=Ba, Sr) represent a new system for investigating Sm2+ in an oxide environment. There are only a few other oxide host lattices stabilizing divalent samarium. Copyright 2000 Academic Press.
Keywords: solid solution; Sm2+; sulfate; flux growth; electrochemical synthesis.
Language: English
Document Type: Research article
Affiliations: Department of Chemistry and Biochemistry, University of Berne, Freiestrasse 3, Berne, CH-3012, Switzerland:
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