Spontaneous strain in synthetic titanite, CaTiOSiO4

2001 ◽  
Vol 65 (6) ◽  
pp. 709-715 ◽  
Author(s):  
T. Malcherek
Keyword(s):  
Phase Transition ◽  
Room Temperature ◽  
Finite Strain ◽  
Paraelectric Phase ◽  
Strain Tensor ◽  
Strain Component ◽  
Volume Strain ◽  
Single Crystal Diffraction ◽  
Paraelectric Phase Transition ◽  
Strain Coupling

AbstractLattice parameters of synthetic titanite powder, CaTiOSiO4, have been determined between room temperature and 1023 K. Only the e11 and e13 components contribute significantly to the strain tensor associated with the antiferroelectric-paraelectric phase transition at Tc = 487 K. A finite strain component e13 is observed in the paraelectric phase for 487 K < T < 825 K. The disappearance of this shear strain marks the isosymmetric transition near 825 K. The temperature evolution of the volume strain and of e11 is proportional to the squared order parameter observed in single-crystal diffraction experiments. The magnitude of the volume strain is sufficiently large to relate the observed near tricritical behaviour of the antiferroelectric-paraelectric phase transition to strain coupling.

Observation of unusual temperature-dependent stripes in LiTaO3and LiTaxNb1−xO3crystals with near-zero birefringence

2010 ◽  
Vol 43 (6) ◽  
pp. 1305-1313 ◽  
Author(s):  
A. M. Glazer ◽  
Nan Zhang ◽  
Ausrine Bartasyte ◽  
D. S. Keeble ◽  
S. Huband ◽  
...  
Keyword(s):  
Phase Transition ◽  
Room Temperature ◽  
Paraelectric Phase ◽  
Microscopy Study ◽  
Vapour Transport ◽  
Temperature Dependent ◽  
Paraelectric Phase Transition ◽  
Optical Birefringence ◽  
Self Organized ◽  
Li Content

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.

Probing the effect of ferroelectric to paraelectric phase transition on the Ti-3d and O-2p hybridization in BaTiO3

2019 ◽  
Vol 125 (21) ◽  
pp. 214102 ◽  
Author(s):  
Gyanendra Panchal ◽  
R. J. Choudhary ◽  
Satish Yadav ◽  
D. M. Phase
Keyword(s):  
Phase Transition ◽  
Paraelectric Phase ◽  
Paraelectric Phase Transition

scholarly journals A tetragonal tungsten bronze-type photocatalyst: Ferro-paraelectric phase transition and photocatalysis

2016 ◽  
Vol 37 (8) ◽  
pp. 1257-1262 ◽  
Author(s):  
Dayong Fan ◽  
Ruifeng Chong ◽  
Fengtao Fan ◽  
Xiuli Wang ◽  
Can Li ◽  
...  
Keyword(s):  
Phase Transition ◽  
Paraelectric Phase ◽  
Tungsten Bronze ◽  
Paraelectric Phase Transition ◽  
Tetragonal Tungsten Bronze

The Ferroelectric-Paraelectric Phase Transition in PbTi0.1,Zr0.9O3

1975 ◽  
Vol 71 (2) ◽  
pp. K173-K176 ◽  
Author(s):  
D. Bäuerle ◽  
R. Clarke ◽  
T. P. Martin
Keyword(s):  
Phase Transition ◽  
Paraelectric Phase ◽  
Paraelectric Phase Transition

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

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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