Particle-size effect on the ferroelectric phase transition in PbSc1/2Ta1/2O3 ceramics

1998 ◽  
Vol 83 (11) ◽  
pp. 5702-5708 ◽  
Author(s):  
Yung Park ◽  
Kevin M. Knowles ◽  
Kurn Cho
Keyword(s):  
Phase Transition ◽  
Particle Size ◽  
Size Effect ◽  
Ferroelectric Phase Transition ◽  
Ferroelectric Phase ◽  
Particle Size Effect

Ferroelectric Phase Transition Investigated by Thermal Analysis and Raman Scattering in SrBi2Ta2O9 Nanoparticles

2007 ◽  
Vol 121-123 ◽  
pp. 843-846 ◽  
Author(s):  
Hua Ke ◽  
De Chang Jia ◽  
Wen Wang ◽  
Yu Zhou
Keyword(s):  
Phase Transition ◽  
Thermal Analysis ◽  
Particle Size ◽  
Phase Transitions ◽  
Size Effect ◽  
Raman Spectra ◽  
Ferroelectric Phase Transition ◽  
Ferroelectric Phase ◽  
Intermediate Phase ◽  
Transition Sequence

Thermal analysis and Raman spectra were carried out in SrBi2Ta2O9 (SBT) nanoparticles to investigate phase transitions. Two anomalies have been observed in temperature dependence of specific heat for SBT nanoparticles. Under the combination with Raman spectra, it indicates that there exists a new ferroelectric intermediate phase in the phase-transition sequence. So we can conclude that the phase-transition sequence in SBT nanoparticles should be ferroelectric-ferroelectric-paraelectric. Moreover, the size effect was discussed in consideration of inner compressive stress in nanoparticles for this special transition behavior. The calculated results show that the SBT nanoparticles keep the ferroelectricity until the particle size is decreased to 4.2 nm.

Size effect on the ferroelectric phase transition inPbTiO3ultrafine particles

1988 ◽  
Vol 37 (10) ◽  
pp. 5852-5855 ◽  
Author(s):  
Kenji Ishikawa ◽  
Kazutoshi Yoshikawa ◽  
Nagaya Okada
Keyword(s):  
Phase Transition ◽  
Size Effect ◽  
Ferroelectric Phase Transition ◽  
Ferroelectric Phase

Primary particle size effect on phase transition in Ba2In2O5

2008 ◽  
Vol 179 (21-26) ◽  
pp. 1029-1031 ◽  
Author(s):  
J.F.Q. Rey ◽  
F.F. Ferreira ◽  
E.N.S. Muccillo
Keyword(s):  
Phase Transition ◽  
Particle Size ◽  
Size Effect ◽  
Primary Particle ◽  
Particle Size Effect ◽  
Primary Particle Size

Particle-size effect on the III-IV phase transition inCsZnPO4

2003 ◽  
Vol 68 (9) ◽  
Author(s):  
Isao Yamashita ◽  
Hitoshi Kawaji ◽  
Tooru Atake ◽  
Yoshihiro Kuroiwa ◽  
Akikatsu Sawada
Keyword(s):  
Phase Transition ◽  
Particle Size ◽  
Size Effect ◽  
Particle Size Effect

Particle size effect on the new phase transition in a tridymite compound, CsCoPO4

2008 ◽  
Vol 92 (2) ◽  
pp. 451-455 ◽  
Author(s):  
H. Kawaji ◽  
Y. Ishihara ◽  
A. Nidaira ◽  
T. Tojo ◽  
T. Atake ◽  
...  
Keyword(s):  
Phase Transition ◽  
Particle Size ◽  
Size Effect ◽  
Particle Size Effect ◽  
New Phase

Size effect on the ferroelectric phase transition in SrBi2Ta2O9 nanoparticles

2003 ◽  
Vol 94 (1) ◽  
pp. 618-620 ◽  
Author(s):  
T. Yu ◽  
Z. X. Shen ◽  
W. S. Toh ◽  
J. M. Xue ◽  
J. Wang
Keyword(s):  
Phase Transition ◽  
Size Effect ◽  
Ferroelectric Phase Transition ◽  
Ferroelectric Phase

scholarly journals The origin of the lattice thermal conductivity enhancement at the ferroelectric phase transition in GeTe

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Đorđe Dangić ◽  
Olle Hellman ◽  
Stephen Fahy ◽  
Ivana Savić
Keyword(s):  
Phase Transition ◽  
Thermal Conductivity ◽  
Phase Transitions ◽  
Thermoelectric Materials ◽  
Ferroelectric Phase Transition ◽  
Lattice Thermal Conductivity ◽  
Ferroelectric Phase ◽  
Structural Phase ◽  
High Symmetry ◽  
Structural Phase Transitions

AbstractThe proximity to structural phase transitions in IV-VI thermoelectric materials is one of the main reasons for their large phonon anharmonicity and intrinsically low lattice thermal conductivity κ. However, the κ of GeTe increases at the ferroelectric phase transition near 700 K. Using first-principles calculations with the temperature dependent effective potential method, we show that this rise in κ is the consequence of negative thermal expansion in the rhombohedral phase and increase in the phonon lifetimes in the high-symmetry phase. Strong anharmonicity near the phase transition induces non-Lorentzian shapes of the phonon power spectra. To account for these effects, we implement a method of calculating κ based on the Green-Kubo approach and find that the Boltzmann transport equation underestimates κ near the phase transition. Our findings elucidate the influence of structural phase transitions on κ and provide guidance for design of better thermoelectric materials.

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