Phase equilibrium investigations and thermodynamic modeling of the HfO2-Ta2O5 system

被引：4

作者：

Loeffler, Manuel ^{[1
]}

Fabrichnaya, Olga ^{[1
]}

机构：

[1] TU Bergakademie Freiberg, Inst Mat Sci, D-09599 Freiberg, Germany

来源：

INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY | 2024年 / 21卷 / 04期

关键词：

heat capacity; phase equilibria; thermal analysis; thermodynamic modeling; CRYSTAL-STRUCTURE; ZR; HF;

D O I：

10.1111/ijac.14648

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 HfO2-Ta2O5 system was investigated using two distinct methods: the equilibration method at temperatures ranging from 1 573 to 1 873 K and the differential thermal analysis method up to 2 473 K. To identify the phases, X-ray diffraction (XRD) and scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM/EDX) were employed. The temperature of the eutectic reaction L -> Hf6Ta2O17+Ta2O5 was measured to be 2 052 K and the eutectic composition to be 66.7 mol.% Ta2O5. The peritectic reaction L+HfO2 -> Hf6Ta2O17 was observed at a temperature of 2 287 K. The heat capacity of the Hf6Ta2O17 phase was measured using differential scanning calorimetry from 240 to 1 300K. The thermodynamic database for the HfO2-Ta2O5 system was derived.

引用

页码：2583 / 2595

页数：13

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