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7 papers · 2 filters
Polarization rotation and the electrocaloric effect in barium titanate
H. H. Wu, R. E. Cohen
We study the electrocaloric effect in the classic ferroelectric BaTiO3 through a series of phase transitions driven by applied electric field and temperature. We find both negative…
Effect of aging and Mn substitution on anisotropy of third generation piezoelectrics
Rajasekarakumar Vadapoo, Muhtar Ahart, Margo Staruch +4
We predict a new candidate high-temperature high-pressure structure of FeSiO with space-group symmetry Cmmm by applying an evolutionary algorithm within DFT+U that we call post…
Origin of Negative Longitudinal Piezoelectric Effect
Shi Liu, R. E. Cohen
Piezoelectrics with negative longitudinal piezoelectric coefficients will contract in the direction of an applied electric field. Such piezoelectrics are thought to be rare but the…
Electric field induced phase transition and electrocaloric effect in PMN-PT
H. H. Wu, R. E. Cohen
Ferroelectric perovskite oxides possess a large electrocaloric (EC) effect, but usually at high temperatures near the ferroelectric/paraelectric phase transition temperature, which…
Optical and structural study of the pressure-induced phase transition of CdWO
J. Ruiz-Fuertes, A. Friedrich, D. Errandonea +5
The optical absorption of CdWO is reported at high pressures up to 23 GPa. The onset of a phase transition was detected at 19.5 GPa, in good agreement with a previous Raman spe…
Improving the Functional Control of Aged Ferroelectrics using Insights from Atomistic Modelling
J. B. J. Chapman, R. E. Cohen, A. V. Kimmel +1
We provide a fundamental insight into the microscopic mechanisms of the ageing processes. Using large scale molecular dynamics simulations of the prototypical ferroelectric materia…