Detecting giant electrocaloric properties of ferroelectric SbSI at room temperature

2013 ◽  
Vol 03 (02) ◽  
pp. 1350008 ◽  
Author(s):  
Mahmoud A. Hamad
Keyword(s):  
Thin Film ◽  
Electric Field ◽  
Room Temperature ◽  
Operating Temperature ◽  
Electrocaloric Effect ◽  
Cooling Systems ◽  
Field Shift

In this work, ferroelectric SbSI shows a giant electrocaloric effect at room temperature under very low electric field shift of 0.37 kV cm-1. It is shown that the cooling ΔT per unit field MVm-1 is 2.97. This value is significantly larger, and is comparable with the value of 0.254 for PbZr 0.95 Ti 0.05 O 3 thin film under electric field shift of 30 kV cm-1. Moreover, the reduction in operating temperature opens up many more possibilities and widens the potential for applications in cooling systems.

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 Giant electrocaloric effect in the thin film relaxor ferroelectric 0.9PbMg1∕3Nb2∕3O3–0.1PbTiO3 near room temperature

2006 ◽  
Vol 89 (24) ◽  
pp. 242912 ◽  
Author(s):  
A. S. Mischenko ◽  
Q. Zhang ◽  
R. W. Whatmore ◽  
J. F. Scott ◽  
N. D. Mathur
Keyword(s):  
Thin Film ◽  
Room Temperature ◽  
Relaxor Ferroelectric ◽  
Electrocaloric Effect

Large electrocaloric effect in lead-free Ba1-xCaxTi1-yZryO3 ceramics under strong electric field at room-temperature

2018 ◽  
Vol 44 (12) ◽  
pp. 13595-13601 ◽  
Author(s):  
Manel ben Abdessalem ◽  
Issa Kriaa ◽  
Abdelhedi Aydi ◽  
Najmeddine Abdelmoula
Keyword(s):  
Electric Field ◽  
Room Temperature ◽  
Strong Electric Field ◽  
Lead Free ◽  
Electrocaloric Effect

scholarly journals Giant isothermal entropy change In (111)-oriented PMN–PT thin film

2014 ◽  
Vol 04 (04) ◽  
pp. 1450026 ◽  
Author(s):  
Mahmoud A. Hamad
Keyword(s):  
Thin Film ◽  
Heat Capacity ◽  
Curie Temperature ◽  
Electric Field ◽  
Curie Point ◽  
Entropy Change ◽  
Relative Cooling Power ◽  
Cooling Power ◽  
Field Shift

An isothermal entropy change of 240 nm (111)-oriented PMN–PT 65/35 film near the ferroelectric Curie temperature, relative cooling power (RCP) and change of heat capacity have been investigated. The extracted data characterized giant isothermal entropy change of more than 16 J/kg K in electric field shift ΔE of 455 kV cm-1, which is nearly twice than that found for PbZr 0.95 Ti 0.05 O 3 thin film at 492 kV cm-1 near the Curie point. Furthermore, the RCP ≈ 700 J/kg and change of heat capacity ≈ 233 J/kg K in electric field shift ΔE of 747 kV cm-1.

scholarly journals Ammonia Room Temperature Gas Sensor Using Different TiO2 Nano-structure

2021 ◽  
Author(s):  
Mostafa Shooshtari ◽  
Alireza Salehi
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Room Temperature ◽  
Operating Temperature ◽  
Anatase Phase ◽  
Fold Increase ◽  
The Other ◽  
Nano Structure ◽  
Two Samples ◽  
Quartz Glasses

Abstract In this study, TiO2 Nano-structure were synthesized by three different processes including nanowires, nanoparticles and thin- films. The morphology and crystal structure of the three different TiO2 structures deposited on quartz glasses were characterized by XRD, SEM and FTIR. It has been found that nanowires and nanoparticles showed only the anatase phase while the thin-film exhibited both anatase and rutile phases. The three TiO2 Nano-structures were then used to fabricate gas sensors for ammonia (NH3) detection at different concentrations and various conditions. The samples fabricated with thin-film TiO2 towards 50 ppm NH3 showed a response value of 5% at room temperature, whereas the other two samples exhibited much higher values towards similar condition NH3 at room temperature. Samples with nanowires showed a three-fold increase and samples with nanoparticles exhibit a two-fold increase in response value. We have found that the response of all samples increases with elevating the operating temperature up to 200°C. Increasing the operating temperature improved the nanoparticle sensing conditions more than the other two samples. The samples using nanoparticles showed a 33% increase in response towards 50 ppm NH3 at 200°C compared to the samples with thin films at similar conditions. Further, response and recovery time were investigated and reported in this study.

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