Electron paramagnetic resonance study of the site preferences of Gd3+ and Eu2+ in polycrystalline silicate and aluminate minerals |
| |
Authors: | Richard V. Morris |
| |
Affiliation: | 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. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|