Premium
High‐temperature structural evolution of hexagonal multiferroic YMnO 3 and YbMnO 3
Author(s) -
Jeong IlKyoung,
Hur N.,
Proffen Th.
Publication year - 2007
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889807025101
Subject(s) - multiferroics , ferroelectricity , rietveld refinement , hexagonal crystal system , materials science , neutron diffraction , condensed matter physics , diffraction , crystallography , hexagonal phase , phase (matter) , crystal structure , physics , chemistry , optics , optoelectronics , quantum mechanics , dielectric
Neutron powder diffraction studies on the structural evolution of hexagonal multiferroic YMnO 3 and YbMnO 3 from 1000 K to 1400 K, and from 1000 K to 1350 K, respectively, are presented. The temperature evolution of diffraction patterns suggests that YMnO 3 undergoes a phase transition to a non‐polar structure above 1200 K, while YbMnO 3 remains ferroelectric up to 1350 K. Detailed structural parameters were obtained as a function of temperature from Rietveld refinements. Based on this result, the distinct differences in temperature behaviour between YMnO 3 and YbMnO 3 , and the origin of the ferroelectricity in these hexagonal multiferroics are discussed.