Neutron total scattering studies on A-site disorder in lead-free ferroelectric Bi0.5(Na1–xKx)0.5TiO3
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Ilkyoung Jeong
Abstract
We performed neutron total scattering meas urements on lead-free ferroelectric Bi0.5(Na1–xKx)0.5TiO3 (x = 0.0, 0.25) and present local structures of A-site (Bi3+, Na+/K+) ions using reverse Monte Carlo modeling. The A-site incorporation of large K+ ions suppresses the tilting of oxygen octahedra and strongly influences the off-center displacement of A-site ions. As a result, we found that the Bi—O bond length redistributes between x = 0.0 and x = 0.25. Compared to the Bi—O bond, the distribution of Na/K—O bond length was broader and smeared. Thus, the interplay between Bi3+ and K+ ions plays a key role in ferroelectric response near morphotropic phase boundary. For the Ti—O bond-length distribution, we found little change between the two compositions despite the long-range symmetry difference. This result suggests that A-site and B-site off-center displacements are decoupled.
© by Oldenbourg Wissenschaftsverlag, Busan, Germany
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Articles in the same Issue
- Preface: Advanced Ferroelectrics: Structure and Properties
- Compositional disorder, polar nanoregions and dipole dynamics in Pb(Mg1/3Nb2/3)O3-based relaxor ferroelectrics
- Spontaneous and induced surface piezoresponse in PbMg1/3Nb2/3O3 single crystals
- Diffuse scattering and local structure modeling in ferroelectrics
- Transformation processes in relaxor ferroelectric PbSc0.5Ta0.5O3 heavily doped with Nb and Sn
- Temperature-dependent synchrotron powder diffraction phase studies of (K0.37Na0.52Li0.03)(Nb0.87Ta0.1Sb0.03)O3 ferroelectric ceramics
- Polar states of the impurity system KTaO3:Li
- Neutron total scattering studies on A-site disorder in lead-free ferroelectric Bi0.5(Na1–xKx)0.5TiO3
- In situ neutron diffraction study of electric field induced structural transitions in lanthanum doped lead zirconate titanate
- A brief review on the model antiferroelectric PbZrO3 perovskite-like material
- Broadband dielectric investigations of indium rich CuInP2S6 layered crystals
- Ferroelectricity and superconductivity: competing or cooperating phenomena
- A new computer tool at the Bilbao Crystallographic Server to detect and characterize pseudosymmetry
