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High‐Temperature Phase Relations in the Lu 2 O 3 –Ta 2 O 5 System
Author(s) -
Xing Xue,
Wang Xiaofei,
Zhang Qingli,
Sun Guihua,
Shi Chaoshu,
Liu Wenpeng,
Sun Dunlu,
Yin Shaotang
Publication year - 2016
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.13977
Subject(s) - phase diagram , analytical chemistry (journal) , materials science , atmospheric temperature range , phase (matter) , crystallography , phase transition , mineralogy , chemistry , physics , thermodynamics , organic chemistry , chromatography
The compounds formed from the Lu 2 O 3 –Ta 2 O 5 system in the composition range 25–60 mol% Ta 2 O 5 were prepared by solid‐state reaction from 1350°C to 2058°C, and the phase transitions were investigated by X‐ray diffraction (XRD). Cubic Lu 3 TaO 7 , M′‐LuTaO 4 , M‐LuTaO 4 , O‐Ta 2 O 5 , and T‐Ta 2 O 5 are observed. With the temperature increase, there is an irreversible phase transition from M′ to M‐LuTaO 4 near 1770°C in the composition of 30–52 mol% Ta 2 O 5 , and another phase transition from T‐Ta 2 O 5 to O‐Ta 2 O 5 at about 1685°C when the ratio of Ta 2 O 5 is >52 and ≤60 mol%. A phase diagram of the Lu 2 O 3 –Ta 2 O 5 system in the range 0–100 mol% Ta 2 O 5 was constructed. These results are helpful to explain the phase transition of Lu 2 O 3 –Ta 2 O 5 system and design the preparation technique of LuTaO 4 single crystal or ceramic scintillator, which may be applied in the fields of nuclear medicine and high‐energy physics.