Sub-solidus phase equilibria in the YO1.5-TaO2.5 system

被引：17

作者：

Fernandez, Abel N. ^{[1
,2
]}

Macauley, Chandra A. ^{[1
,3
]}

Park, Daesung ^{[1
]}

Levi, Carlos G. ^{[1
]}

机构：

[1] Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA

[2] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA

[3] Friedrich Alexander Univ FAU Erlangen Nurnberg, Dept Mat Sci & Engn, Inst 1, D-91058 Erlangen, Germany

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2018年 / 38卷 / 14期

基金：

美国国家科学基金会;

关键词：

Yttria; Tantala; Phase diagram; High temperature; Ceramic; HIGH-TEMPERATURE FORM; RARE-EARTH NIOBATES; M = NB; CRYSTAL-STRUCTURE; TANTALUM PENTOXIDE; OXIDE ADDITIONS; FLUORITE-TYPE; SB; TA; SC;

D O I：

10.1016/j.jeurceramsoc.2018.06.024

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 in the YO1.5-TaO2.5 binary system were studied in air from 1250 degrees C to 1700 degrees C across the entire composition range, clarifying discrepancies in previous investigations. Materials were synthesized by precursor routes and phases identified by X-ray diffraction and Raman spectroscopy. Solubility limits were determined using TEM/EDS and EPMA. The fluorite phase field was shown to extend down to at least 1250 degrees C. Ordering phenomena in two closely related phases near Y3TaO7 were investigated, suggesting a second-order ordering relationship between them. The order-disorder transformation to fluorite was observed to occur through formation of a superstructure. The homogeneity range for YTa7O19 was expanded based on chemical analysis, while YTa3O9 was shown to be a line compound. The emerging understanding provides valuable insight into related ternary systems as well as inputs for thermodynamic assessments.

引用

页码：4786 / 4798

页数：13

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