Electron paramagnetic resonance study of the site preferences of Gd<sup>3+</sup> and Eu<sup>2+</sup> in polycrystalline silicate and aluminate minerals期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Electron paramagnetic resonance study of the site preferences of Gd³⁺ and Eu²⁺ in polycrystalline silicate and aluminate minerals

Authors:	Richard V Morris

Institution:	Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706, U.S.A.

Abstract:	Electron paramagnetic resonance (EPR) measurements were made on Gd³⁺ and Eu²⁺ ions in polycrystalline samples to determine the nature of the sites occupied by those ions in mineral structures. Both Gd³⁺ and Eu²⁺ ions were incorporated at Ca²⁺ structural sites in β-Ca₂SiO₄, pseudo-CaSiO₃, CaMgSiO₄, CaMgSi₂O₆, hex-CaAl₂Si₂O₈, CaAl₂O₄, and Ca₃Al₂O₆. For tri-CaAl₂Si₂O₈, Eu²⁺ was incorporated at a Ca²⁺ site and Gd³⁺ was incorporated at a site where the crystalline electric field was disordered. That difference in behavior may contribute to the anomalous behavior of Eu in plagioclase feldspar. Both Gd³⁺ and Eu²⁺ were incorporated as aggregates or clusters of those ions in Mg₂SiO₄ and clino-MgSiO₃.

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