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High‐entropy, phase‐constrained, lanthanide sesquioxide
Author(s) -
Tseng KuoPin,
Yang Qun,
McCormack Scott J.,
Kriven Waltraud M.
Publication year - 2020
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.16689
Subject(s) - sesquioxide , bixbyite , lanthanide , chemistry , powder diffraction , synchrotron , crystallography , oxide , phase (matter) , thermal stability , thermodynamics , materials science , inorganic chemistry , ion , physics , organic chemistry , nuclear physics
Oxides can experience structural transformations resulting from variations in cation oxidation states or coordination geometry upon thermal treatment. Whether such structural distortions can affect the stability of high‐entropy oxides has not been studied. In this research, a new, high‐entropy, lanthanide sesquioxide, Gd 0.4 Tb 0.4 Dy 0.4 Ho 0.4 Er 0.4 O 3 solid solution having a single phase, cubic‐bixbyite structure was synthesized, with no phase transformation from room temperature to 1650°C. The phase stability was examined via both in situ and ex situ, high‐temperature, synchrotron, X‐ray powder diffraction. This high‐entropy oxide could inhibit the phase transformations occurring in constituent monocation sesquioxides, Tb 2 O 3 and Gd 2 O 3 , via random arrangement of multications.