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.

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.

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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