Ba-Modified Bi–Na–Sr Titanate: Exploring Structural, Dielectric, and Electrocaloric Properties for Cooling Applications

IF 3.6 4区工程技术 Q3 ENERGY & FUELS

Energy technology Pub Date : 2025-03-11 DOI:10.1002/ente.202402094

Ranjeet Sukachari Ughade, Anshu Gaur, Preeti, Jyotiranjan Rout, Kanhaiya Lal Yadav, Mahamad Ahamad Mohiddon

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Abstract

The present work reports the structural, dielectric, and electrocaloric properties of Ba-doped (Bi_0.5Na_0.5)_0.8Sr_0.2TiO₃ (BNST) synthesized by the solid-state reaction route. Rietveld refined X-ray diffraction data is used to analyze the influence of Ba doping on the lattice parameters, crystallite size, and lattice strain of BNST. The dielectric characteristics of the Ba-doped BNST samples are analyzed in terms of complex permittivity, AC conductivity, and complex impedance. The dynamic properties of dipoles and the conduction charges are investigated from the frequency-dependent (100 Hz–1 MHz) dielectric response. Electrocaloric properties are assessed by the indirect method using the Maxwell equation. Polarization of pure and Ba-substituted BNST varies in a complex manner as a function of temperature leading to positive and negative electrocaloric effects in different temperature ranges within room temperature-160 °C, beneficial for exploiting the increasing and decreasing, both, cycles of the applied electric field for producing cooling effect. The dipolar entropy is consistent with the literature.

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ba -改性Bi-Na-Sr钛酸盐：用于冷却应用的结构、介电和电热性能的探索

本文报道了采用固相反应方法合成的掺钡（Bi0.5Na0.5）0.8Sr0.2TiO3 （BNST）的结构、介电性能和电热性能。利用Rietveld细化x射线衍射数据分析了Ba掺杂对BNST晶格参数、晶粒尺寸和晶格应变的影响。从复介电常数、交流电导率和复阻抗等方面分析了掺钡BNST样品的介电特性。从频率相关（100 Hz-1 MHz）的介电响应研究了偶极子和导电电荷的动态特性。用麦克斯韦方程间接评价了热学性质。在室温-160℃的不同温度范围内，纯BNST和ba -取代BNST的极化随温度变化复杂，导致正、负热效应，有利于利用外加电场的增减循环来产生冷却效果。偶极熵与文献一致。

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来源期刊

Energy technology ENERGY & FUELS-

CiteScore

7.00

自引率

5.30%

发文量

审稿时长

1.3 months

期刊介绍： Energy Technology provides a forum for researchers and engineers from all relevant disciplines concerned with the generation, conversion, storage, and distribution of energy. This new journal shall publish articles covering all technical aspects of energy process engineering from different perspectives, e.g., new concepts of energy generation and conversion; design, operation, control, and optimization of processes for energy generation (e.g., carbon capture) and conversion of energy carriers; improvement of existing processes; combination of single components to systems for energy generation; design of systems for energy storage; production processes of fuels, e.g., hydrogen, electricity, petroleum, biobased fuels; concepts and design of devices for energy distribution.