Colossal negative electrocaloric effects in anti-ferroelectric PLZST bulk ferroelectrics for solid-sate refrigeration

Colossal negative electrocaloric effects in anti-ferroelectric PLZST bulk ferroelectrics for solid-sate refrigeration

A giant negative electro-caloric effect is present in PLZST ceramics over a wide range of temperatures at high fields for the new generation of the solid-state refrigeration process. The structural phase purity, ambiguity of phases, and coexistence of dual structural phase modulation over the substi...

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Bibliographic Details
Published in:Journal of materials science. Materials in electronics Vol. 34; no. 32; p. 2134
Main Authors: Babu, N. Ch. Ramesh, Lakshmi, P. Vijaya, Ravi, G., Rao, N. Narasimha, Ansari, Anees A., Ram, N. Raghu, Govindu, G., Paliki, Ajay Kumar, Kandula, Kumara Raja, Bhimireddi, Rajasekhar
Format: Journal Article
Language:English
Published: New York Springer US 01-11-2023
Springer Nature B.V
Subjects:
Antiferroelectricity
Characterization and Evaluation of Materials
Chemistry and Materials Science
Electric fields
Ferroelectric materials
Materials Science
Optical and Electronic Materials
Optimization
Phase modulation
Phase transitions
Refrigeration
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Summary:A giant negative electro-caloric effect is present in PLZST ceramics over a wide range of temperatures at high fields for the new generation of the solid-state refrigeration process. The structural phase purity, ambiguity of phases, and coexistence of dual structural phase modulation over the substitution were identified clearly with the help of different standard models. The dielectric measurement demonstrates that the phase transition from the orthorhombic anti-ferroelectric phase (AFEO) to the tetragonal anti-ferroelectric phase (AFET) happens at 155 °C, while the phase transition from AFET to paraelectric (PE) occurs at 227 °C for PLZST( x  = 0.91). The change in entropy (ΔS) and adiabatic temperature change (ΔT) was estimated at different fields from 100 to 225 kV/cm. The maximum ΔT = − 4.1 K was obtained at different electric fields over the region of phase transition anti-ferroelectric and ferroelectric phases. The estimation of the real ΔT values in the negative region compared with existing literature turns out to be good optimization for -life application of refrigeration.
ISSN:0957-4522
1573-482X
DOI:10.1007/s10854-023-11572-7