Thermal and Nuclear Quantum Effects at the Antiferroelectric to Paraelectric Phase Transition in KOH and KOD Crystals

A birefringence imaging microscopy study of LiTaO3and some mixed LiTaxNb1−xO3crystals is reported. The initially congruent LiTaO3crystals have been subject to vapour transport equilibration in order to increase the Li content and at the same time to reduce the optical birefringence close to zero at room temperature. In both types of crystal, the presence of unusual periodic self-organized stripes, existing over large distances, has been observed, which correlate with the well documented cleavage and twin planes in this material. Furthermore, the stripes become narrower as the temperature is changed away from the zero-birefringence temperature, but become temperature-independent above the ferroelectric–paraelectric phase-transition temperature.

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Nature of the ferroelectric-paraelectric phase transition in lithium tantalate

Solid State Communications ◽

10.1016/0038-1098(72)90195-0 ◽

1972 ◽

Vol 10 (9) ◽

pp. 793-796 ◽

Cited By ~ 21

Author(s):

M.E. Lines

Keyword(s):

Phase Transition ◽

Paraelectric Phase ◽

Lithium Tantalate ◽

Paraelectric Phase Transition

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Landau theory-based analysis of grain-size dependence of ferroelectric-to-paraelectric phase transition and its thermal hysteresis in barium titanate ceramics

Journal of Physics Condensed Matter ◽

10.1088/0953-8984/11/6/024 ◽

1999 ◽

Vol 11 (6) ◽

pp. 1601-1613 ◽

Cited By ~ 17

Author(s):

Dan Ricinschi ◽

Vasile Tura ◽

Liliana Mitoseriu ◽

Masanori Okuyama

Keyword(s):

Phase Transition ◽

Grain Size ◽

Barium Titanate ◽

Size Dependence ◽

Paraelectric Phase ◽

Thermal Hysteresis ◽

Landau Theory ◽

Paraelectric Phase Transition ◽

Titanate Ceramics

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Nature of ferroelectric to paraelectric phase transition in multiferroic 0.8BiFeO3–0.2Pb(Fe1/2Nb1/2)O3 ceramics

Journal of Applied Physics ◽

10.1063/1.3428410 ◽

2010 ◽

Vol 107 (10) ◽

pp. 104115 ◽

Cited By ~ 27

Author(s):

Jay Prakash Patel ◽

Anar Singh ◽

Dhananjai Pandey

Keyword(s):

Phase Transition ◽

Paraelectric Phase ◽

Paraelectric Phase Transition

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Impedance and Dielectric Properties of Nb-Doped Pb(Zr0.52Ti0.48)O3 Ceramics

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.55-57.129 ◽

2008 ◽

Vol 55-57 ◽

pp. 129-132

Author(s):

Piyachon Ketsuwan ◽

Athipong Ngamjarurojana ◽

Yongyut Laosiritaworn ◽

Supon Ananta ◽

Rattikorn Yimnirun ◽

...

Keyword(s):

Phase Transition ◽

Dielectric Constant ◽

Paraelectric Phase ◽

Dopant Concentration ◽

Rhombohedral Phase ◽

Paraelectric Phase Transition ◽

Nb Content ◽

Dielectric Maximum ◽

Increasing Temperature ◽

Curie Temperature Tc

The compositions of Pb(Zr0.52Ti0.48)O3 doped with 1-6 mole% Nb content were prepared by a conventional mixed oxide technique. It was found that the phase formed depended on the dopant concentration. At lower concentration, the dominate phase was the tetragonal. With increasing Nb content the rhombohedral phase tended to increase. Furthermore, the Curie temperature (Tc) and dielectric constant decreased with increasing Nb concentration and the dielectric maximum peaks were broadened with more rhombohedral phase presence, causing the diffused ferroelectric-paraelectric phase transition. The impedance of the samples decreased with increasing temperature and it was also observed that the impedance increased with increasing Nb concentration.

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