Ferroelectric Phase Transitions in Sn2P2S6and Sn2P2Se6Crystals

Moriya, Keiichi; Kuniyoshi, Hideaki; Tashita, Kohji; Ozaki, Yoshitada; Yano, Shinichi; Matsuo, Takasuke

doi:10.1143/jpsj.67.3505

Cited by 47 publications

(29 citation statements)

References 25 publications

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“…A paraelectric-ferroelectric transition has been identified in the semiconducting chalcogenides M 2 P 2 X 6 (M =Sn, Pb and X=S, Se), and well studied by a variety of methods [71][72][73][74][75][76]. Further interest was stimulated by the observation of a photovoltaic effect in Sn 2 P 2 S 6 crystals [77].…”

Section: M2p2(sse)6 Chalcogenidesmentioning

confidence: 99%

Integration of first-principles methods and crystallographic database searches for new ferroelectrics: Strategies and explorations

Bennett¹,

Rabe²

2012

Journal of Solid State Chemistry

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In this concept paper, the development of strategies for the integration of first-principles methods with crystallographic database mining for the discovery and design of novel ferroelectric materials is discussed, drawing on the results and experience derived from exploratory investigations on three different systems: (1) the double perovskite Sr(Sb 1/2 Mn 1/2 )O3 as a candidate semiconducting ferroelectric; (2) polar derivatives of schafarzikite M Sb2O4; and (3) ferroelectric semiconductors with formula M2P2(S,Se)6. A variety of avenues for further research and investigation are suggested, including automated structure type classification, low-symmetry improper ferroelectrics, and highthroughput first-principles searches for additional representatives of structural families with desirable functional properties.

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Section: M2p2(sse)6 Chalcogenidesmentioning

confidence: 99%

Integration of first-principles methods and crystallographic database searches for new ferroelectrics: Strategies and explorations

Bennett¹,

Rabe²

2012

Journal of Solid State Chemistry

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“…The temperature dependence for the Sn 2 P 2 S 6 crystal heat capacity [42] and the separate contributions C and C from acoustic and optic modes, which were calculated according to the known Debye and Einstein models, are presented in Fig. 5.…”

Section: C τmentioning

confidence: 99%

Acoustic attenuation in ferroelectric Sn2P2S6 crystals

et al. 2010

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Abstract:The temperature and frequency dependencies of sound attenuation for the proper uniaxial ferroelectric Sn 2 P 2 S 6 , which has a strong nonlinear interaction of the polar soft optic and fully symmetrical optic modes that is related to the triple well potential, were studied by Brillouin spectroscopy. It was found that the sound velocity anomaly is described in the Landau-Khalatnikov approximation with one relaxation time. For explanation of the observed temperature and frequency dependencies of the sound attenuation in the ferroelectrric phase, the accounting of several relaxation times is needed and, for quantitative calculations, the mode Gruneisen coefficients are more appropriate as interacting parameters than are the electrostrictive coefficients. Relaxational sound attenuation by domain walls also appears in the ferroelectric phase of

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“…Not mentioning the possibility of using the relation (1) to estimate the PT character in Sn 2 P 2 S 6 and Sn 2 P 2 Se 6 crystals. According to the calorimetric data [14] for these crystals, the entropy of the transition from paraelectric phase to ferroelectric phase equals 8.6 and 10 J K −1 mol −1 . Herein, the empiric factor R = 0.69 for Sn 2 P 2 S 6 and R = 0.64 for Sn 2 P 2 Se 6 .…”

Section: Introductionmentioning

confidence: 92%

“…This component is also observed in a spectral response of the soft phonons both for Sn 2 P 2 S 6 and Sn 2 P 2 Se 6 (figures 2 and 3). Calorimetric studies [14] of both crystals reveal a large entropy of the phase transitions: 8.6 K −1 mol −1 for the ferroelectric-paraelectric transition in Sn 2 P 2 S 6 , and 8.5 and 1.5 K −1 mol −1 for the ferroelectric-IC transition and IC phase-paraelectric phase transitions, correspondingly, in case of Sn 2 P 2 Se 6 (figure 6). These entropy values are close to 2R ln 2 = 11.4 K −1 mol −1 which corresponds to a positional disordering of Sn 2+ cations.…”

Section: Introductionmentioning

confidence: 96%

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THE PHASE TRANSITIONS CHARACTER AND MICROSCOPIC MODELS FOR Sn_2P_2S(Se)_6 FERROELECTRICS

Vysochanskii¹,

Drobnich²

2002

Condens. Matter Phys.

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The paper considers an example of concrete objects, i.e. ferroelectrics of Sn 2 P 2 S 6 family, for which, according to general estimations, a correlation between the shape of a phase diagram (the presence of a Lifshitz point and of a tricritical point) and a crossover "displacive to order/disorder" is observed. Simulations by means of microscopic models, which most adequately represent a dipole ordering in these crystals, are analyzed. A dimension dependence of a ferroelectric phase transition temperature for microcrystals of Sn 2 P 2 S 6 compound is considered.

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Ferroelectric Phase Transitions in Sn₂P₂S₆and Sn₂P₂Se₆Crystals

Cited by 47 publications

References 25 publications

Integration of first-principles methods and crystallographic database searches for new ferroelectrics: Strategies and explorations

Integration of first-principles methods and crystallographic database searches for new ferroelectrics: Strategies and explorations

Acoustic attenuation in ferroelectric Sn2P2S6 crystals

THE PHASE TRANSITIONS CHARACTER AND MICROSCOPIC MODELS FOR Sn_2P_2S(Se)_6 FERROELECTRICS

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