Pressure Induced Phase Transition in NaNbO3

被引：1
|
作者：
Mishra, S. K. [1 ]
Mittal, R. [1 ]
Chaplot, S. L. [1 ]
Hansen, Thomas
机构：
[1] Bhabha Atom Res Ctr, Div Solid State Phys, Bombay 400085, Maharashtra, India
来源：
SOLID STATE PHYSICS, VOL 57 | 2013年 / 1512卷
关键词：
Antiferro/Ferro; Neutron diffraction; Crystallographic aspects of phase transformations; LEAD-FREE;
D O I：
10.1063/1.4790905
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We report high pressure powder neutron diffraction study in technologically important material sodium niobate using high-flux D20 neutron diffractometer at Institut Laue-Langevin, France. The measurements were carried out using Paris-Edinburgh cell upto 11 GPa in the pressure intervals of 1-2 GPa at 300 K. Rietveld refinement of the powder diffraction data revealed that diffraction patterns could be indexed using the orthorhombic structure (space group Pbcm) up to 6 GPa. Careful inspection of pressure dependence of diffraction data showed appearance and disappearance of certain superlattice reflections around 7 GPa. The new superlattice reflections that appear at 7 GPa, could be indexed by using an orthorhombic phase with space group Pbnm. We also observed that the response of the structural parameters with pressure is strongly anisotropic.
引用
收藏
页码：50 / 51
页数：2
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