Phase stability of multiferroic GaFeO3 up to 1368 K from in situ neutron diffraction

被引：22

作者：

Mishra, S. K. ^{[1
]}

Mittal, R. ^{[1
]}

Singh, Ripandeep ^{[1
]}

Zbiri, M. ^{[2
]}

Hansen, T. ^{[2
]}

Schober, H. ^{[2
]}

机构：

[1] Bhabha Atom Res Ctr, Div Solid State Phys, Bombay 400085, Maharashtra, India

[2] Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France

来源：

JOURNAL OF APPLIED PHYSICS | 2013年 / 113卷 / 17期

关键词：

OXIDE;

D O I：

10.1063/1.4803679

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report a detailed high-temperature powder neutron diffraction investigation of the structural behavior of the multiferroic GaFeO3 between 296 and 1368 K. Temperature dependent neutron diffraction patterns do not show any appreciable change either in intensity or appearance/disappearance of the observed peaks up to 1368 K, ruling out any structural transition in the entire temperature range. Evolution of the distortion of the oxygen polyhedra around Ga-1, Ga-2, Fe-1, and Fe-2 cations sites suggest that the Ga-1-O tetrahedron is least distorted and Fe-1-O is most distorted. Structural features regarding the distortion of polyhedral units would be crucial to understand the temperature dependence of the microscopic origin of polarizations. The electric polarization has been estimated using a simple ionic model and its value is found to decrease with increasing temperature. (C) 2013 AIP Publishing LLC.

引用

页数：5

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