Phase relationships and stability of α'-SiAlON
Phase relationships and stability of α'-SiAlON
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DOI：
10.1111/j.1151-2916.1999.tb01869.x
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发表时间：
1999-04
影响因子：
3.9
通讯作者：
A. Rosenflanz;I. Chen
中科院分区：
文献类型：
--
作者：
A. Rosenflanz;I. Chen
研究了不同温度下含镱、钇和钕体系在α′-SiAlON平面上的相图。确定了α′-SiAlON、β′-SiAlON、AlN多型体和液/晶界相之间的相关系。α′-SiAlON相的稳定区域随着温度的升高而增大，稀土离子的离子尺寸减小。同时，Al和O在β′-SiAlON中的溶解度随Al和O在α′-SiAlON中的溶解度而变化，导致在较低温度和较大改性阳离子时，α′-SiAlON中的所有相线都向富氮侧迁移。这些相关系的系统变化充分解释了有时在该系统中观察到的α′→β′逆相变的发生。
Phase diagrams on the α′-SiAlON plane have been investigated for ytterbium-, yttrium-, and neodymium-containing systems at different temperatures. Phase relationships between α′-SiAlON, β′-SiAlON, AlN polytypoids, and liquid/grain-boundary phases have been determined. The stability region of the α′-SiAlON phase increases as the temperature increases and the ionic size of the rare-earth cation decreases. Meanwhile, the solubility of aluminum and oxygen in β′-SiAlON varies with the solubility of aluminum and oxygen in α′-SiAlON, which causes migration of all the phase lines on the α′-plane toward the nitrogen-rich side at lower temperatures and with larger modifying cations. These systematic variations of the phase relationships fully explain the occurrence of α′→β′ reverse transformations that are sometimes observed in this system.