Size-dependent ultrahigh electrocaloric effect near pseudo-first-order phase transition temperature in barium titanate nanoparticles

RSC Advances ◽  
2015 ◽  
Vol 5 (47) ◽  
pp. 37476-37484 ◽  
Author(s):  
Hong-Hui Wu ◽  
Jiaming Zhu ◽  
Tong-Yi Zhang
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Order Phase Transition ◽  
Electrocaloric Effect ◽  
First Order ◽  
Size Dependent ◽  
First Order Phase Transition ◽  
Pseudo First Order ◽  
Barium Titanate Nanoparticles ◽  
First Order Phase

The proposed Pseudo-First-Order Phase Transition in a ferroelectric nanoparticle occurs at a temperature lower than its paraelectric/ferroelectric transition Curie temperature and is associated with an ultrahigh electrocaloric effect.

scholarly journals Электрокалорический эффект в твердом растворе BaTiO-=SUB=-3-=/SUB=--SrTiO-=SUB=-3-=/SUB=-

2018 ◽  
Vol 44 (2) ◽  
pp. 49
Author(s):  
Е.П. Смирнова ◽  
Г.Ю. Сотникова ◽  
Н.В. Зайцева ◽  
А.А. Капралов ◽  
Г.А. Гаврилов
Keyword(s):  
Phase Transition ◽  
Solid Solution ◽  
Electric Field ◽  
Order Phase Transition ◽  
Piezoelectric Properties ◽  
Electrocaloric Effect ◽  
First Order ◽  
First Order Phase Transition ◽  
Bias Electric Field ◽  
First Order Phase

AbstractWe have studied the electrocaloric effect in 0.68BaTiO_3–0.32SrTiO_3 solid solution, as well as the dielectric, pyroelectric, and piezoelectric properties of this compound in the vicinity of the first-order phase transition in a bias electric field. The dielectric and electromechanical contributions to the pyroelectric and electrocaloric effects are discussed.

scholarly journals Gravitational wave signals of dark matter freeze-out

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
Danny Marfatia ◽  
Po-Yan Tseng
Keyword(s):  
Phase Transition ◽  
Dark Matter ◽  
Gravitational Waves ◽  
Order Phase Transition ◽  
First Order ◽  
Stochastic Background ◽  
First Order Phase Transition ◽  
Relic Abundance ◽  
First Order Phase ◽  
Freeze Out

Abstract We study the stochastic background of gravitational waves which accompany the sudden freeze-out of dark matter triggered by a cosmological first order phase transition that endows dark matter with mass. We consider models that produce the measured dark matter relic abundance via (1) bubble filtering, and (2) inflation and reheating, and show that gravitational waves from these mechanisms are detectable at future interferometers.

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