☆ 4.6 Article

The A-site Li+ driven orthorhombic-tetragonal ferroelectric phase transition and evolving local structures in (Na,K)(Nb,Sb)O3-LiTaO3 lead-free ceramics

APPLIED PHYSICS LETTERS (2013)

Journal

APPLIED PHYSICS LETTERS

Volume 102, Issue 12, Pages -

Publisher

AMER INST PHYSICS

DOI: 10.1063/1.4798830

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Categories

Physics, Applied

Funding

Natural Science Foundation Anhui Province [1108085J14]
National Natural Science Foundation of China [51272060]

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Abstract

Synchrotron x-ray diffraction and absorption fine structure and Raman spectra on (Na,K)(Nb,Sb)O-3-LiTaO3 ceramics suggested that the compositionally induced orthorhombic to tetragonal (O-T) ferroelectric phase transition is dominantly driven by A-site Li+ ions with a large [001] off centering, while B-site Nb atoms are only localized near their average positions of the NbO6 octahedra between O and T phases. The Nb-O octahedra distort over the phase transition by adjusting their positions and orientations. The continuous change of lattice constants b(o) and a(t) across the phase boundary would facilitate the O-T phase transition through a jump of polar axis from pseudocubic [101] to [001]. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4798830]

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