Phase equilibria studies of the CaO-SbOx system in air

被引：1

作者：

Li, Shu ^{[1
]}

Wei, Wenjie ^{[1
]}

Wang, Guangyu ^{[1
]}

Weng, Zemeng ^{[1
]}

Zhang, Boya ^{[2
]}

Cao, Zhanmin ^{[1
]}

机构：

[1] Univ Sci & Technol Beijing, Sch Met & Ecol Engn, Beijing 100083, Peoples R China

[2] Yunnan Copper Co Ltd, Kunming, Peoples R China

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2025年 / 108卷 / 04期

关键词：

(Ca6Sb2O11) (s.s); CaO-SbOx system; crystal structure; phase diagrams; phase transition; OXIDE-BASED GLASSES; ANTIMONY TRIOXIDE; CRYSTAL-STRUCTURE; POLYMORPHISM; TRANSITIONS;

D O I：

10.1111/jace.20286

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The phase equilibria information of the CaO-SbOx system in the range of 700-1580 degrees C in air was obtained for the first time using quenching method and thermal analysis. The equilibrium phase compositions were determined using x-ray diffraction and Scanning Electron Microscopy-Energy Dispersion Spectrum. The invariant reaction temperatures were determined using thermogravimetry-differential scanning calorimetry. A perovskite solid solution between Ca2Sb2O7 and CaO, designated as (Ca6Sb2O11)(s.s), was observed. Within this solid solution, three polymorphic forms were identified: orthorhombic, tetragonal, and cubic. The transition temperatures between these polymorphic forms vary with compositional changes. Additionally, the crystal structure of cubic Ca6Sb2O11 was analyzed. CaSb2O6 was observed to decompose into Ca2Sb2O7, Sb4O6, and O-2 above 1336 +/- 5 degrees C. The eutectic temperature of alpha-Sb2O4 and CaSb2O6 was found to be 1220 +/- 5 degrees C.

引用

页数：19

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