Local structure analysis of NaNbO3

1st Conference on Light and Particle Beams in Materials Science 2013

物理学;材料科学

Yoneda, Y.^1 ; Fu, D.^2 ; Kohara, S.^3

Japan Atomic Energy Agency (JAEA), Sayo-gun, Hyogo 679-5148, Japan^1

Division of Global Research Leaders, Shizuoka University, Shizuoka 432-8651, Hamamatsu, Japan^2

Japan Synchrotron Radiation Research Institute (JASRI), Sayo-gun, Hyogo 679-5198, Japan^3

关键词: Anti ferroelectrics;    Atomic pair distribution functions;    High energy X ray;    Orthorhombic structures;    Rhombohedral structures;    Structural phase transition;    Technological applications;    Temperature and pressures;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/502/1/012022/pdf
DOI  :  10.1088/1742-6596/502/1/012022

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

NaNbO3 has an antiferroelectric structure at room temperature and finds important technological applications. It exhibits an unusual complex sequence of temperature-and pressure-driven structural phase transitions. NaNbO3 shows unambiguous evidence for the presence of the ferroelectric R3c phase coexisting with an antiferroelectric phase (Pbcm) over a wide range of temperatures. We have carried out atomic pair-distribution function (PDF) analysis on NaNbO3 to understand the phase transitions. High-energy X-ray PDF using powder samples were carried out at the SPring-8, which is provided to become rhombohedral structure if A-site atoms did order and to become orthorhombic structure if A-site atoms did disorder.