Effect of a Nonequilibrium State on Phase Relations in the System TiO_2-Sc_2O_3 (40-50 mol % Sc_2O_3)

L. P. Lyashenko; I. V. Kolbanev; L. G. Shcherbakova; E. I. Knerelman; G. I. Davydova

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Effect of a Nonequilibrium State on Phase Relations in the System TiO_2-Sc_2O_3 (40-50 mol % Sc_2O_3)

机译：非平衡态对体系TiO_2-Sc_2O_3（40-50 mol％Sc_2O_3）中相关系的影响

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The phase transitions in TiO_2-Sc_2O_3 (40-50 mol % Sc_2O_3) samples prepared from coprecipitated and mechanically activated oxide mixtures are studied. It is shown that heat treatment below 1000℃ leads to the formation of nonstoichiometric, metastable cubic phases with a distorted fluorite structure. With increasing temperature, this structure transforms into a stable fluorite-like structure through (low-symmetry) orthorhombic and hexagonal phases, which is associated with the incorporation of OH groups. Characteristically, the phases studied contain nanoscale regions differing in the degree of ordering, which result from internal stress. The internal stress in mechanically activated phases is shown to be fully relieved by about 1300℃.

机译：研究了由共沉淀和机械活化的氧化物混合物制备的TiO_2-Sc_2O_3（40-50 mol％Sc_2O_3）样品中的相变。结果表明，低于1000℃的热处理会导致形成非化学计量的亚稳态立方相，萤石结构变形。随着温度的升高，该结构通过（低对称）正交相和六方相转变为稳定的萤石状结构，这与OH基的引入有关。具有特征的是，研究的相包含有序度不同的纳米级区域，这是由内应力引起的。机械活化相的内应力显示可以完全缓解1300℃。

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来源
《Inorganic materials》 |2004年第8期|p.833-839|共7页
作者
L. P. Lyashenko; I. V. Kolbanev; L. G. Shcherbakova; E. I. Knerelman; G. I. Davydova;
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作者单位

Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432 Russia;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种 eng
中图分类工程材料学;
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Effect of a Nonequilibrium State on Phase Relations in the System TiO_2-Sc_2O_3 (40-50 mol % Sc_2O_3)

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