High‐Temperature Phase Relations in the System Y2O3‐Ta2O5
High‐Temperature Phase Relations in the System Y2O3‐Ta2O5
复制标题
Y2O3-Ta2O5 体系中的高温相关系
DOI：
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发表时间：
1991
期刊：
影响因子：
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通讯作者：
M. Yoshimura
中科院分区：
文献类型：
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作者：
Y. Yokogawa;M. Yoshimura
本文用1350°、1500°和1700°C的固相反应和直至熔化温度的热分析研究了Gd_2O_3-Ta_2O_5系统在50 - 100mol%Gd_2O_3范围内的相关系。具有Gd 3 TaO 7组成的斜方晶系（W2相，空间群C2221）似乎在约2040°C下不一致地熔化，尽管该Gd 3 TaO 7相先前被报道为一致地熔化。在1500°C以上首次发现了一种新的萤石型立方相（F相，空间群Fm 3 m）。它在2318° 3°C下与约80mol%Gd2O3的组成一致地熔化。提出了Gd_2O_3-Ta_2O_5系统富Gd_2O_3区的相图
The Phase relations of the system Gd2O3-Ta2O5 in the composition range 50 to100 mol% Gd2O3 was studied by solidstate reactions at 1350°, 1500°, or 1700°C and by thermal analyses up to the melting temperatures. Weberite-type orthorhombic phase (W2 phase, space group C2221) with the composition of Gd3 TaO7 seems to melt incongruently; at about 2040°C, although this Gd3TaO7 Phase was previously reported to melt congruently. A new fluorite-type cubic phase (F phase, space group Fm3m) was found for the first time above 1500°C in the system. It melts congruently with the composition of about 80mol% Gd2O3at 2318° 3°C. A phase diagram was proposed for the system Gd2O3–Ta2O5 in the Gd2O3–rich portion