Xiang Niu, Yuleng Jiang, Junying Lai, Wei Liang, Huanwei Liu, Xiaodong Jian, Xiaobo Zhao, Yingbang Yao, Bo Liang, Tao Tao, Sheng-Guo Lu
{"title":"通过掺杂 Bi(Mg0.5Zr0.5)O3,在无铅 Na0.5Bi0.5TiO3 基弛豫铁电体中增强宽温度范围内的电致发光效应","authors":"Xiang Niu, Yuleng Jiang, Junying Lai, Wei Liang, Huanwei Liu, Xiaodong Jian, Xiaobo Zhao, Yingbang Yao, Bo Liang, Tao Tao, Sheng-Guo Lu","doi":"10.1049/nde2.12069","DOIUrl":null,"url":null,"abstract":"<p>With an increasing demand for environmentally friendly refrigeration, the solid-state refrigeration based on the electrocaloric effect (ECE) has been drawn extensive attention. It is a challenge to maintain a large adiabatic temperature change (∆<i>T</i>) over a broad temperature span. Herein, the authors designed and synthesised (0.74-<i>x</i>) Na<sub>0.5</sub>Bi<sub>0.5</sub>TiO<sub>3</sub>-0.06BaTiO<sub>3</sub>-0.2SrTiO<sub>3</sub>-<i>x</i>Bi(Mg<sub>0.5</sub>Zr<sub>0.5</sub>)O<sub>3</sub> (abbreviated as NBT-<i>x</i>BMZ) (<i>x</i> = 0, 0.02, 0.04, 0.06 and 0.08) lead-free relaxor ferroelectrics. Their microstructures, dielectric properties, ferroelectric properties, ECEs and the structure-property relationships were investigated. Via doping with BMZ, an enhanced relaxor feature and a wider temperature range where multi-phases coexist were achieved. The relaxor ferroelectric characteristics were illustrated using the Vogel-Fulcher relation. The indirectly calculated ECE results showed that the optimal Δ<i>T</i> of 1.11 K was obtained for the <i>x</i> = 0.02 sample at 90°C and 70 kV/cm over a wide <i>T</i><sub>span</sub> of 120°C, providing a potential ECE material. The direct ECE results procured using thermocouple indicated that the maximal ∆<i>T</i> of 2.14 K and ∆<i>T</i>/∆<i>E</i> of 0.31 K m/MV were achieved in the same sample at 70°C and 7 MV/m and the variation trend of ECE results was consistent with the indirect results. Moreover, the multi-phases coexistent strategy can be extended to other materials system to generate a large Δ<i>T</i> over a wide temperature range.</p>","PeriodicalId":36855,"journal":{"name":"IET Nanodielectrics","volume":null,"pages":null},"PeriodicalIF":3.8000,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.12069","citationCount":"0","resultStr":"{\"title\":\"Enhanced electrocaloric effect over a broad temperature range in lead-free Na0.5Bi0.5TiO3-based relaxor ferroelectrics via doping with Bi(Mg0.5Zr0.5)O3\",\"authors\":\"Xiang Niu, Yuleng Jiang, Junying Lai, Wei Liang, Huanwei Liu, Xiaodong Jian, Xiaobo Zhao, Yingbang Yao, Bo Liang, Tao Tao, Sheng-Guo Lu\",\"doi\":\"10.1049/nde2.12069\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>With an increasing demand for environmentally friendly refrigeration, the solid-state refrigeration based on the electrocaloric effect (ECE) has been drawn extensive attention. It is a challenge to maintain a large adiabatic temperature change (∆<i>T</i>) over a broad temperature span. Herein, the authors designed and synthesised (0.74-<i>x</i>) Na<sub>0.5</sub>Bi<sub>0.5</sub>TiO<sub>3</sub>-0.06BaTiO<sub>3</sub>-0.2SrTiO<sub>3</sub>-<i>x</i>Bi(Mg<sub>0.5</sub>Zr<sub>0.5</sub>)O<sub>3</sub> (abbreviated as NBT-<i>x</i>BMZ) (<i>x</i> = 0, 0.02, 0.04, 0.06 and 0.08) lead-free relaxor ferroelectrics. Their microstructures, dielectric properties, ferroelectric properties, ECEs and the structure-property relationships were investigated. Via doping with BMZ, an enhanced relaxor feature and a wider temperature range where multi-phases coexist were achieved. The relaxor ferroelectric characteristics were illustrated using the Vogel-Fulcher relation. The indirectly calculated ECE results showed that the optimal Δ<i>T</i> of 1.11 K was obtained for the <i>x</i> = 0.02 sample at 90°C and 70 kV/cm over a wide <i>T</i><sub>span</sub> of 120°C, providing a potential ECE material. The direct ECE results procured using thermocouple indicated that the maximal ∆<i>T</i> of 2.14 K and ∆<i>T</i>/∆<i>E</i> of 0.31 K m/MV were achieved in the same sample at 70°C and 7 MV/m and the variation trend of ECE results was consistent with the indirect results. Moreover, the multi-phases coexistent strategy can be extended to other materials system to generate a large Δ<i>T</i> over a wide temperature range.</p>\",\"PeriodicalId\":36855,\"journal\":{\"name\":\"IET Nanodielectrics\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":3.8000,\"publicationDate\":\"2023-12-06\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://onlinelibrary.wiley.com/doi/epdf/10.1049/nde2.12069\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"IET Nanodielectrics\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://onlinelibrary.wiley.com/doi/10.1049/nde2.12069\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"ENGINEERING, ELECTRICAL & ELECTRONIC\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"IET Nanodielectrics","FirstCategoryId":"1085","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1049/nde2.12069","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}
Enhanced electrocaloric effect over a broad temperature range in lead-free Na0.5Bi0.5TiO3-based relaxor ferroelectrics via doping with Bi(Mg0.5Zr0.5)O3
With an increasing demand for environmentally friendly refrigeration, the solid-state refrigeration based on the electrocaloric effect (ECE) has been drawn extensive attention. It is a challenge to maintain a large adiabatic temperature change (∆T) over a broad temperature span. Herein, the authors designed and synthesised (0.74-x) Na0.5Bi0.5TiO3-0.06BaTiO3-0.2SrTiO3-xBi(Mg0.5Zr0.5)O3 (abbreviated as NBT-xBMZ) (x = 0, 0.02, 0.04, 0.06 and 0.08) lead-free relaxor ferroelectrics. Their microstructures, dielectric properties, ferroelectric properties, ECEs and the structure-property relationships were investigated. Via doping with BMZ, an enhanced relaxor feature and a wider temperature range where multi-phases coexist were achieved. The relaxor ferroelectric characteristics were illustrated using the Vogel-Fulcher relation. The indirectly calculated ECE results showed that the optimal ΔT of 1.11 K was obtained for the x = 0.02 sample at 90°C and 70 kV/cm over a wide Tspan of 120°C, providing a potential ECE material. The direct ECE results procured using thermocouple indicated that the maximal ∆T of 2.14 K and ∆T/∆E of 0.31 K m/MV were achieved in the same sample at 70°C and 7 MV/m and the variation trend of ECE results was consistent with the indirect results. Moreover, the multi-phases coexistent strategy can be extended to other materials system to generate a large ΔT over a wide temperature range.