Results 31 to 40 of about 5,651 (284)

Random electric field instabilities of relaxor ferroelectrics

npj Quantum Materials, 2017
Complex oxides: A random field state in a relaxor ferroelectric A microscopic model shows how compositional disorder in the form of quenched random electric fields acting in concert with dipolar interactions prohibit long-range ordering in relaxor ...
José R. Arce-Gamboa, Gian G. Guzmán-Verri   +1 more
doaj   +1 more source

Relaxor Ferroelectric Polymers: Insight into High Electrical Energy Storage Properties from a Molecular Perspective

Small Science, 2021
Relaxor ferroelectric polymers exhibit both high dielectric constants and low remnant polarization and thus deliver much higher energy densities and greater charge–discharge efficiencies than normal ferroelectrics for capacitive energy storage ...
Yang Liu, Yen-Ting Lin, Aziguli Haibibu, Wenhan Xu, Yao Zhou, Li Li, Seong H. Kim, Qing Wang   +7 more
doaj   +1 more source

Orbital-Order Driven Ferroelectricity and Dipolar Relaxation Dynamics in Multiferroic GaMo$_4$S$_8$ [PDF]

, 2018
We present the results of broadband dielectric spectroscopy of GaMo$_4$S$_8$, a lacunar spinel system that recently was shown to exhibit non-canonical, orbitally-driven ferroelectricity.
Geirhos, K., Krohns, S., Kézsmárki, I., Lunkenheimer, P., Nakamura, H., Tabata, Y., Waki, T.   +6 more
core   +2 more sources

NMR and the local structure of relaxors [PDF]

Science of Sintering, 2002
The relaxor transition in cubic perovskite relaxors (PMN, PSN and PST) and tungsten bronze relaxor (SBN) has been studied by NMR. The observed spectra are composed of a narrow -1/2 « 1/2 central transition superimposed on a broad background due to ...
Blinc R., Zalar B., Gregorovič Alan
doaj   +1 more source

First Principles Theories of Piezoelectric Materials

, 2007
Piezoelectrics have long been studied using parameterized models fit to experimental data, starting with the work of Devonshire in 1954. Much has been learned using such approaches, but they can also miss major phenomena if the materials properties are ...
Cohen, R. E.
core   +1 more source

Finite-size effects in lead scandium tantalate relaxor thin films [PDF]

, 2020
Large electromechanical effects in relaxor ferroelectrics are generally attributed to the collective response of an ensemble of correlated, nanometer-sized polar structures induced by chemical and charge disorder.
Fernandez, A, Kim, J, Martin, LW, Meyers, D, Saremi, S   +4 more
core  

Theoretical prediction of electrocaloric effect based on non-linear behaviors of dielectric permittivity under temperature and electric fields

AIP Advances, 2015
The electrocaloric (EC) effect has been paid great attentions recently for applications on cooling or electricity generation. However, the directly commercial measurement equipment for the effect is still unavailable.
Hongbo Liu, Xue Yang
doaj   +1 more source

Enhanced strain and electrostrictive properties in lead-free BNT-based ceramics via rare earth doping

Journal of Materiomics, 2022
Bi0.5Na0.5TiO3 (BNT)-based ceramics are one of the most promising lead-free ferroelectrics due to their high strain property. Compared to other chemical modifications, rare earth ions doping provides significant possibility to optimize the strain ...
Anping Deng, Jiagang Wu
doaj   +1 more source

Dielectric nonlinearity of relaxor ferroelectric ceramics at low ac drives

, 2000
Dielectric nonlinear response of (PbMg$_{1/3}$Nb$_{2/3}$O$_3$)$_{0.9}$(PbTiO$_3$)$_{0.1}$ (0.9PMN-0.1PT) relaxor ceramics was investigated under different ac drive voltages. It was observed that: (i) the dielectric permittivity is independent on ac field
Bing-Lin Gu, Bokov V A, Chen J, Colla E V, Cross L E, Glazounov A E, Glazounov A E, Gui H, Liu Xi, Newnham R E, Pan X Q, Randall C A, Shrout T R, Smolenski G A, Swartz S L, Tan Q, Uchino K, Xi Liu, Xiao-Wen Zhang, Zhi-Rong Liu   +19 more
core   +1 more source

Anisotropic Local Correlations and Dynamics in a Relaxor Ferroelectric [PDF]

, 2012
Relaxor ferroelectrics have been a focus of intense attention due to their anomalous dielectric characteristics, diffuse phase transitions, and strong piezoelectricity.
Grinberg, Ilya, Rappe, Andrew M., Takenaka, Hiroyuki   +2 more
core   +3 more sources