Intensive electrocaloric effect in triglycine sulfate under nonequilibrium thermal conditions and periodic electric field

2016 ◽  
Vol 253 (10) ◽  
pp. 2073-2078 ◽  
Author(s):  
V. S. Bondarev ◽  
E. A. Mikhaleva ◽  
M. V. Gorev ◽  
I. N. Flerov
Keyword(s):  
Electric Field ◽  
Thermal Conditions ◽  
Triglycine Sulfate ◽  
Electrocaloric Effect ◽  
Periodic Electric Field

scholarly journals Influence of thermal conditions on the electrocaloric effect in a multilayer capacitor based on doped BaTiO3

2017 ◽  
Vol 07 (06) ◽  
pp. 1750041 ◽  
Author(s):  
V. S. Bondarev ◽  
I. N. Flerov ◽  
M. V. Gorev ◽  
E. I. Pogoreltsev ◽  
M. S. Molokeev ◽  
...  
Keyword(s):  
Electric Field ◽  
Thermal Conditions ◽  
Electrocaloric Effect ◽  
Indirect Measurements ◽  
Multilayer Capacitor ◽  
Direct Measurements ◽  
Periodic Electric Field ◽  
Thermal Switches ◽  
Further Development ◽  
Good Agreement

We present the results of studies of thermal expansion, heat capacity, permittivity, polarization and the influence of different thermal conditions on the intensive electrocaloric effect (ECE), [Formula: see text], in a commercial multilayer capacitor based on doped BaTiO3. Investigations in a wide temperature range revealed one anomaly in the behavior of the physical properties at about 290[Formula: see text]K characteristic for the relaxors. Direct measurements showed a high reversibility of ECE under equilibrium thermal conditions. Good agreement was found between the values of [Formula: see text] determined by direct and indirect measurements at the electric field up to 15.4[Formula: see text]kV/cm. Quasi-isothermal conditions lead, firstly, to decrease of large [Formula: see text]0.94[Formula: see text]K obtained in adiabatic conditions under [Formula: see text][Formula: see text]kV/cm to 0.87[Formula: see text]K, and, secondly, the appearance of a difference between the values of [Formula: see text] and [Formula: see text] determined when the electric field is applied and removed. Using this phenomenon and changing the frequency of the periodic electric field, [Formula: see text][Formula: see text]kV/cm, the effect of cooling was obtained equal to [Formula: see text][Formula: see text]K. The results obtained are useful for further development of the electrocaloric refrigeration technique without thermal switches.

Electrocaloric Effect of (110) Oriented KNbO3 Film

2021 ◽  
Vol 21 (10) ◽  
pp. 5247-5252
Author(s):  
MinYa Jin ◽  
JianHua Qiu ◽  
ZhiHui Chen ◽  
XiuQin Wang ◽  
NingYi Yuan ◽  
...  
Keyword(s):  
Electric Field ◽  
Thermodynamic Equilibrium ◽  
Thermodynamic Potential ◽  
Room Temperature ◽  
Misfit Strain ◽  
Equilibrium Conditions ◽  
Electrocaloric Effect ◽  
Phase Map ◽  
The Stability

The room temperature electrocaloric effect is researched for (110) oriented KNbO3 film based on Landau-Devonshire theory. The phase map with different ferroelectric states is built at room temperature with the considerations of thermodynamic equilibrium conditions and minimum of thermodynamic potential. Five ferroelectric structural phases are obtained theoretically. The negative in-plane misfit strains are conducive to form the tetragonal c phase and the positive strains are in favor of the stability of tetragonal a1 and a2 phases. The electrocaloric effect relies on both misfit strain and electric field. Moreover, large electrocaloric effect is achieved in the orthorhombic phases.

scholarly journals Large room-temperature electrocaloric effect in lead-free BaHf Ti O3 ceramics under low electric field

2016 ◽  
Vol 115 ◽  
pp. 58-67 ◽  
Author(s):  
Junning Li ◽  
Dawei Zhang ◽  
Shiqiang Qin ◽  
Tangyuan Li ◽  
Ming Wu ◽  
...  
Keyword(s):  
Electric Field ◽  
Room Temperature ◽  
Lead Free ◽  
Electrocaloric Effect

scholarly journals Electric-Field Control of Magnon Gaps in a Ferromagnet using a Spatially-Periodic Electric Field

SPIN ◽  
2017 ◽  
Vol 07 (03) ◽  
pp. 1740012 ◽  
Author(s):  
Glade Sietsema ◽  
Tianyu Liu ◽  
Michael E. Flatté
Keyword(s):  
Magnetic Material ◽  
Electric Field ◽  
Magnetic Materials ◽  
Spin Wave ◽  
Wave Dispersion ◽  
Magnetic Insulators ◽  
Periodic Electric Field ◽  
Field Control ◽  
Spatially Periodic ◽  
Propagation Properties

The frequencies and linewidths of spin waves in one-dimensional (1D) and two-dimensional (2D) periodic superlattices of magnetic materials are found, using the Landau–Lifshitz–Gilbert equations. The form of the exchange field from a surface-torque-free boundary between magnetic materials is derived, and magnetic-material combinations are identified which produce gaps in the magnonic spectrum across the entire superlattice Brillouin zone for hexagonal and square-symmetry superlattices. The magnon gaps and spin-wave dispersion properties of a uniform magnetic material under the influence of a periodic electric field are presented. Such results suggest the utility of magnetic insulators for electric-field control of spin-wave propagation properties.

Sign in / Sign up

Export Citation Format

Share Document