Journal ArticleDOI
Phase Transition in Sr 2 Nb 2 O 7 at 215°C
TLDR
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.Abstract:
A new phase transition in Sr 2 Nb 2 O 7 was found at 215°C in addition to the already known phase transitions. 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.read more
Citations
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Journal ArticleDOI
New Phases of Sr 2 Ta 2 O 7 and Sr 2 Nb 2 O 7 Found by Electron Microscopy and Diffraction
TL;DR: In this paper, electron microscopy was used to find low temperature phases of the monoclinic system with space group P2 1 /m with the appearance of characteristic twin and antiphase domains.
Journal ArticleDOI
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.
Journal ArticleDOI
Structural instabilities, incommensurate modulations and P and Q phases in sodium niobate in the temperature range 300 500 K
L. A. Reznichenko,L. A. Shilkina,E. S. Gagarina,I. P. Raevskii,Evgeniy Dul'kin,E. M. Kuznetsova,V. V. Akhnazarova +6 more
TL;DR: In this article, the relation between the phase transition in the vicinity of 420 K and the formation of an incommensurate phase in the temperature range 410-460 K is established based on the X-ray, dielectric, and dilatometric studies of single crystals and ceramics.
Journal ArticleDOI
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.
Journal ArticleDOI
Optical mode softening in the incommensurate phase of Sr2Nb2O7
TL;DR: 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.
References
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Journal ArticleDOI
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.
Journal ArticleDOI
The crystal structure of Sr2Nb2O7, a compound with perovskite-type slabs
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The growth of ferroelectric single crystal Sr2Nb2O7 by means of the floating zone technique
M Takahashi,S Nanamatsu,M Kimura +2 more
TL;DR: In this article, a floating zone technique has been used for the synthesis of single crystals of new ferroelectric materials, and the molten zone of the material was formed by radiant heating using a halogen lamp.