Thermodynamic studies on the ferroelectric phase transition in neutron irradiated (LixK1−x)2SO4 crystals at high temperature

1991 ◽  
Vol 37 (3) ◽  
pp. 533-540 ◽  
Author(s):  
M. E. Kassem ◽  
A. M. El-Khatib ◽  
E. A. Ammar ◽  
M. M. Denton
Keyword(s):  
Phase Transition ◽  
High Temperature ◽  
Ferroelectric Phase Transition ◽  
Ferroelectric Phase ◽  
Thermodynamic Studies

High-temperature ferroelectric phase transition observed in multiferroic Bi0.91La0.05Tb0.04FeO3

2009 ◽  
Vol 95 (1) ◽  
pp. 012909 ◽  
Author(s):  
Q. H. Jiang ◽  
F. T. Liu ◽  
Ce-Wen Nan ◽  
Yuan-Hua Lin ◽  
M. J. Reece ◽  
...  
Keyword(s):  
Phase Transition ◽  
High Temperature ◽  
Ferroelectric Phase Transition ◽  
Ferroelectric Phase

scholarly journals A high-temperature organic–inorganic ferroelectric with outstanding switchable dielectric characteristics

RSC Advances ◽  
2017 ◽  
Vol 7 (76) ◽  
pp. 47933-47937 ◽  
Author(s):  
Cong Xu ◽  
Wenjun Zhang ◽  
Linsong Gao ◽  
Xuecheng Gan ◽  
Xiaofan Sun ◽  
...  
Keyword(s):  
Phase Transition ◽  
High Temperature ◽  
Ferroelectric Phase Transition ◽  
Ferroelectric Phase ◽  
Hybrid Compound ◽  
Dielectric Characteristics ◽  
Inorganic Hybrid ◽  
Compound C

A new molecular ferroelectric is discovered in an organic–inorganic hybrid compound, (C6H5NH3)2CdCl4, which undergoes a reversible order–disorder ferroelectric phase transition at 369 K.

The first high-temperature multiaxial ferroelectric host–guest inclusion compound

2019 ◽  
Vol 55 (77) ◽  
pp. 11571-11574 ◽  
Author(s):  
Han-Yue Zhang ◽  
Si-Qi Lu ◽  
Xin Chen ◽  
Ren-Gen Xiong ◽  
Yuan-Yuan Tang
Keyword(s):  
Phase Transition ◽  
High Temperature ◽  
Ferroelectric Phase Transition ◽  
Inclusion Compound ◽  
Ferroelectric Phase

A host–guest inclusion compound, 18-crown-6 oxonium tetrachloride-gallium(iii), was shown to undergo a 4/mmmFmm2-type ferroelectric phase transition with four crystallographically equivalent polarization directions at 337 K.

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.

Sign in / Sign up

Export Citation Format

Share Document