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High‐Temperature Transitions in Rare‐Earth Niobates and TantaIates
Author(s) -
STUBIČAN V. S.
Publication year - 1964
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/j.1151-2916.1964.tb15654.x
Subject(s) - tetragonal crystal system , rare earth , monoclinic crystal system , ionic radius , materials science , diffractometer , phase transition , mineralogy , germanate , transition temperature , crystallography , ion , crystal structure , chemistry , condensed matter physics , doping , physics , superconductivity , optoelectronics , organic chemistry
The high‐temperature transition monoclinic tetragonal in the rare‐earth tantalates and niobates with the formula AB04 was investigated using a high‐temperature X‐ray diffractometer. The transition was reversible and proceeded by a gradual change in symmetry. The temperature of the first appearance of the tetragonal phase increased as the ionic size of the rare‐earth ions decreased and was considerably higher for the rare‐earth tantalates than for the rare‐earth niobates. The mechanism of the change is discussed.