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

IF 3.8 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC IET Nanodielectrics Pub Date : 2023-12-06 DOI:10.1049/nde2.12069
Xiang Niu, Yuleng Jiang, Junying Lai, Wei Liang, Huanwei Liu, Xiaodong Jian, Xiaobo Zhao, Yingbang Yao, Bo Liang, Tao Tao, Sheng-Guo Lu
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引用次数: 0

摘要

随着人们对环保制冷的需求日益增加,基于电热效应(ECE)的固态制冷受到了广泛的关注。在较宽的温度范围内保持较大的绝热温度变化(∆T)是一项挑战。在此,作者设计并合成了(0.74‐x) Na0.5Bi0.5TiO3‐0.06 batio3‐0.2SrTiO3‐xBi(Mg0.5Zr0.5)O3(缩写为NBT‐xBMZ) (x = 0,0.02, 0.04, 0.06和0.08)无铅弛豫铁电体。研究了它们的显微结构、介电性能、铁电性能、电化学性能和结构-性能关系。通过掺杂BMZ,实现了增强的弛豫特性和更宽的多相共存温度范围。利用Vogel - Fulcher关系说明了弛豫铁电特性。间接计算的ECE结果表明,在90°C和70 kV/cm的120°C宽Tspan下,x = 0.02样品获得了1.11 K的最佳ΔT,提供了一种潜在的ECE材料。采用热电偶直接测得的ECE结果表明,同一样品在70℃、7 MV/m条件下,最大∆T为2.14 K,∆T/∆E为0.31 K m/MV, ECE结果的变化趋势与间接测得结果一致。此外,多相共存策略可以扩展到其他材料体系,在宽温度范围内产生大的ΔT。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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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.

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来源期刊
IET Nanodielectrics
IET Nanodielectrics Materials Science-Materials Chemistry
CiteScore
5.60
自引率
3.70%
发文量
7
审稿时长
21 weeks
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