Experimental Investigation of Phase Relations in the ZrO2-La2O3-Yb2O3 System

被引：15

作者：

Ilatovskaia, M. ^{[1
]}

Sun, S. ^{[1
,2
]}

Saenko, I. ^{[1
]}

Savinykh, G. ^{[1
]}

Fabrichnaya, O. ^{[1
]}

机构：

[1] Tech Univ Bergakad Freiberg, Inst Mat Sci, Gustav Zeuner Str 5, D-09599 Freiberg, Germany

[2] Beijing Inst Technol, Sch Mat Sci & Engn, 5 South Zhongguancun St, Beijing 100081, Peoples R China

来源：

JOURNAL OF PHASE EQUILIBRIA AND DIFFUSION | 2020年 / 41卷 / 04期

关键词：

CALPHAD; La2O3-Yb2O3; system; phase diagram; solid state reaction; ZrO2-based system; HIGH-TEMPERATURE; HEAT-CAPACITY; RARE-EARTH; THERMODYNAMIC FUNCTIONS; LA2ZR2O7; STABILITY; ND2ZR2O7; DIAGRAM; OXIDES;

D O I：

10.1007/s11669-020-00790-9

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The phase equilibria in the La2O3-Yb2O3 system were investigated using differential thermal analysis, and the phase transformations temperatures were verified. Microstructure investigation using scanning electron microscopy confirmed the presence of eutectoid reactions in the system. The heat capacity of LaYbO3 with a perovskite structure was measured in the temperature range from 250 to 1250 K using differential scanning calorimetry. The experimental results of the present work as well as reliable literature data were used to derive a thermodynamic description of the La2O3-Yb2O3 system. Isothermal sections of the ZrO2-La2O3-Yb2O3 system were constructed based on x-ray and microstructural investigations. The tie-lines change from Pyrochlore + Yb2O3_C to LaYbO3_Perovskite + Fluorite was explained by a solid-state reaction occurring in the range between 1673 and 1873 K. The heat effect observed at 1858 K using DTA confirms the phase transformation, and its temperature was established more precisely at 1808 +/- 15 K using stepwise heat treatment.

引用

页码：311 / 328

页数：18

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