Detecting giant electrocaloric effect in SrxBa1−xNb2O6 single crystals

Abstract

PbZr0.95Ti0.05O3 thin film is the best electrocaloric effect material which has cooling ΔT per unit field (MV m−1) about 0.254 under electric field shift ΔE = 30 kV cm−1 at Curie temperature Tc = 222 °C [A. S. Mischenko, Q. Zhang, J. F. Scott, R. W. Whatmore, N. D. Mathur, Science 311, 1270 (2006)]. Here, it is shown that an EC effect due to applied electric field shift parallel to the c-axis in SrxBa1−xNb2O6 single crystals thin film has a value of cooling per unit field larger than PbZr0.95Ti0.05O3 thin film. Furthermore, SrxBa1−xNb2O6 single crystals have Curie temperature Tc closer to room temperature.

A novel sol–gel route to synthesize (Sr0.5Ba0.5)Nb2O6 ceramics with enhanced electrocaloric effect

“…[15][16][17] Recently, Hamad 18 simulated the ECE of (Sr x Ba 1Àx )Nb 2 O 6 single-crystal thin films and certified that (Sr x Ba 1Àx )Nb 2 O 6 is a potential candidate for solid-state refrigeration.…”

Room temperature giant electrocaloric properties of relaxor ferroelectric 0.93PMN-0.07PT thin film

“…[1][2][3][4][5][6][7][8][9][10][11][12] Ferroelectric refrigeration is based on the ECE, an entropy change of ferroelectric material during application or withdrawal of electric field. Commonly, the change of entropy between low-temperature ferroelectric phase with ordered dipoles and high temperature paraelectric phase without dipoles is involved in ECE process and remarkable ECE always occurs near Curie temperature.…”

Anisotropy of the Electrocaloric Effect in Lead‐Free Relaxor Ferroelectrics

“…The ECE anisotropy has been previously studied, but only in materials with relatively isotropic character, such as PMN-PT [ 19,20 ] or PZN-PT [ 21 ] perosvkites, and never in highly anisotropic materials, such as SBN, with the exception of Hamad. [ 22 ] However the work of Hamad was purely theoretical and no direct ECE measurements were ever performed. Vertical and lateral mode piezoforce microscope (PFM) by…”