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Giant Negative Electrocaloric Effect in Anti-Ferroelectric (Pb(0.97)La(0.02))(Zr(0.95)Ti(0.05))O(3) Ceramics
[Image: see text] A giant electrocaloric effect is reported in (Pb(0.97)La(0.02))(Zr(0.95)Ti(0.05))O(3) anti-ferroelectric ceramics. These samples were fabricated by a solid-state mixed oxide technique. Dielectric analyses were employed to investigate the anti-ferroelectric (AFE) and ferroelectric (...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical Society
2019
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6740168/ https://www.ncbi.nlm.nih.gov/pubmed/31528821 http://dx.doi.org/10.1021/acsomega.9b02149 |
Sumario: | [Image: see text] A giant electrocaloric effect is reported in (Pb(0.97)La(0.02))(Zr(0.95)Ti(0.05))O(3) anti-ferroelectric ceramics. These samples were fabricated by a solid-state mixed oxide technique. Dielectric analyses were employed to investigate the anti-ferroelectric (AFE) and ferroelectric (FE) phase transitions of the sample. During the heating process, the phase transition from the orthorhombic anti-ferroelectric phase (AFE(O)) to the tetragonal anti-ferroelectric phase (AFE(T)) occurs at 155 °C, and the phase transition from AFE(T) to PE occurs at 225 °C. Using the Maxwell relationship, the entropy change ΔS and adiabatic temperature change ΔT were obtained at different electric fields ranging from 40 to 65 kV/cm. The maximum adiabatic temperature change (ΔT(max) = −7.47 K) was obtained at 50 kV/cm, which was attributed to the field-induced phase transformation between the anti-ferroelectric and ferroelectric phases. These results showed that PLZT2/95/5 ceramics possess a large negative electrocaloric effect value, which could be applied in achieving cooling power as refrigerants. |
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