稀土倍半氧化物的相稳定性——新方法

Modern Concepts in Material Science Pub Date : 2020-01-03 DOI:10.33552/MCMS.2020.02.000539

G. Kimmel

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引用次数: 1

摘要

低温合成表明，固体稀土倍半氧化物(RESOX)在2000℃以下随温度和金属离子半径的变化可分为三种结构类型。(1) La2O3和Nd2O3为六方结构，金属离子半径最大;(2)Sm2O3、Eu2O3和Gd2O3为低温立方结构和高温单斜结构，金属离子半径中等;(3)Dy2O3、Y2O3、Ho2O3、Er2O3、Tm2O3、Yb2O3、Lu2O3和Sc2O3为立方结构，金属离子半径较小[1,2]。

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Phase Stability of Rare-Earth Sesquioxides - New Approach

Based on low temperature synthesis it was stated that solid rare earth sesquioxides (RESOX) below 2000 °C belong to three structure types as function of temperature and metallic ionic radius. (I) Hexagonal for La2O3 and Nd2O3 with the highest metallic ionic radius, (II) Low Temperature (LT) cubic and High Temperature (HT) monoclinic for Sm2O3, Eu2O3 and Gd2O3 with medium metallic ionic radius, (III) cubic for Dy2O3, Y2O3, Ho2O3, Er2O3, Tm2O3, Yb2O3, Lu2O3 and Sc2O3 with low metallic ionic radius [1,2].

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Modern Concepts in Material Science

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