Low-temperature structural and dielectric phenomena in La1/3NbO3 and La1/3TaO3: Comparative study
作者： Andrei N. Salak , Nikolai P. Vyshatko , Dmitry D. Khalyavin , Oleksandr Prokhnenko , Victor M. Ferreira
DOI: 10.1063/1.3006331
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摘要: The crystal structures of the perovskites La1/3NbO3 and La1/3TaO3 were studied between 10 350 K using high-resolution neutron powder diffraction compared with their radio-frequency dielectric response over same temperature range. structure remains orthorhombic Cmmm, while undergoes continuous transition from high-temperature tetragonal P4/mmm to Cmmm phase at about 220 K. This is tricritical in nature accompanied by no anomaly. In La1/3NbO3, frequency-dependent peak permittivity associated an atypical increase lattice parameters below 80
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