Journal ArticleDOI
Optical mode softening in the incommensurate phase of Sr2Nb2O7
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TLDR
In the incommensurate phase below about 220°C of Sr2Nb2O7, the soft mode of which frequency decreases toward 215°C has been found by the Raman scattering measurements in the b(cc) b scattering geometry.About:
This article is published in Solid State Communications.The article was published on 1979-09-01. It has received 29 citations till now. The article focuses on the topics: Soft modes & Scattering.read more
Citations
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Experimental studies of structurally incommensurate crystal phases
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Dielectric and light scattering spectroscopy of incommensurate phases in crystals
TL;DR: In this paper, a review of all the corresponding experimental data published up to the middle of 1980 are reviewed and consistently interpreted taking into account the specific selection rules recenily derived.
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Crystal chemical aspects of the layered perovskite-like oxide ferroelectrics of the AnMnO3n 2 type
TL;DR: In this paper, the crystal chemical aspects of ferroelectrics AnMnO3n+2 with layered perovskite-like structure (the idealized and real structures, nature of phase transitions, the Curie temperatures, peculiar properties of Sr2Ta2O7, stability of the layered structure, formation of solid solutions) are discussed.
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Polar phonons and far-infrared amplitudon in Sr2Nb2O7
TL;DR: In this article, the E||a and E||c polarizations were analyzed in the subsequent paraelectric-ferroelectric-incommensurate-monoclinic phases and the factor group analysis together with the correlation of the modes was presented.
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Efficient thermoelectricity in Sr 2 Nb 2 O 7 with energy-dependent relaxation times
TL;DR: In this paper, the authors evaluate theoretically the thermoelectric efficiency of the layered perovskite via calculations of the electronic structure and transport coefficients within density-functional theory and Bloch-Boltzmann relaxation-time transport theory.
References
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Crystallographic and Dielectric Properties of Ferroelectric A2B2O7 (A=Sr, B=Ta, Nb) Crystals and Their Solid Solutions
TL;DR: The phase transition temperatures of other solid solutions, partially replacing Sr by Ca, Pb or Ba, are also studied on ceramic samples as mentioned in this paper, where the Curie-Weiss temperature θ 0 and Curie constant C P are: θ0 =161 K(=-112°C) and C P =0.84×10 5 K.
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The crystal structure of Sr2Nb2O7, a compound with perovskite-type slabs
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Phase Transition in Sr 2 Nb 2 O 7 at 215°C
TL;DR: In this article, a new phase transition in Sr 2 Nb 2 O 7 was found at 215°C, in addition to the already known phase transitions, and the elastic compliance coefficients, the electromechanical coupling factor and the dielectric constant of an Sr 2 nb 2 o 7 single crystal show anomaly around 215°c.
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Raman scattering studies on phase transition in barium sodium niobate at high pressure
TL;DR: In this article, the phase transition in barium sodium niobate at high pressure was investigated by Raman scattering experiments, and a remarkable pressure dependence of the frequencies of the bending modes of NbO6 octahedrons was observed.