Ferroelectric polarization and domain walls in orthorhombic (K1−xNax)NbO3 lead-free ferroelectric ceramics

Lu, Ning; Yu, Rong; Cheng, Zhiying; Dai, Yejing; Zhang, Xiaowen; Zhu, Jing

doi:doi:10.1063/1.3442905

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Microstructure of epitaxial strained BiCrO₃ thin films

The structure and microstructure of fully strained BiCrO3 thin films have been investigated by x-rays diffraction and transmission electron diffraction, at room temperature. Interestingly, three structural variants are simultaneously stabilized within the film. While two of them are consistent with the existing phases in the bulk-below and above the 420 K structural transition, a different phase is identified. The existence of various structures has been attributed to the inhomogeneous distribu...

Terahertz radiation from coherent antiferromagnetic magnons excited by femtosecond laser pulses

We report on the observation of terahertz (THz) radiation emitted from antiferromagnetic (AFM) single-crystal nickel oxide irradiated with femtosecond laser pulses. Periodic oscillations observed in the THz waveforms are assigned to the radiation from coherent AFM magnons excited by the laser pulses. Impulsive stimulated Raman scattering process is a possible mechanism of the coherent AFM magnon excitation by the laser pulses. The excited magnons in NiO generate THz waves by magnetic dipole rad...

Combining aberration-corrected high-resolution transmission electron microscopy with first-principles calculations, we have investigated the ferroelectric polarization and the atomic structures of 60°/120° domain walls in orthorhombic (K_0.46Na_0.54)NbO₃ lead-free ferroelectric ceramics. The projections of cation-oxygen dipoles across the 60°/120° domain walls were determined using the recently developed negative spherical-aberration imaging technique. The measured ferroelectric distortion matched well with that obtained from first-principles calculations. The width across the wall was measured to be ∼ 1.1 nm.

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KEYWORDS and PACS

Keywords

ab initio calculations, distortion, electric domain walls, electro-optical effects, ferroelectric ceramics, magnetic domain walls, polarisation, potassium compounds, sodium compounds, transmission electron microscopy

PACS

77.80.Dj

Domain structure; hysteresis
75.60.Ch

Domain walls and domain structure
78.20.Jq

Electro-optical effects
71.15.-m

Methods of electronic structure calculations

ARTICLE DATA

Digital Object Identifier

http://dx.doi.org/10.1063/1.3442905

PUBLICATION DATA

ISSN

0003-6951 (print)

1077-3118 (online)

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American Institute of Physics

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