Enhanced temperature stability and reduced tan δ in B-site modified titanate-based high-entropy perovskite oxides

IF 3.5 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of the American Ceramic Society Pub Date : 2025-01-02 DOI:10.1111/jace.20353

Ketkaeo Bunpang, Widchaya Somsri, David P. Cann, Natthaphon Raengthon

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引用次数: 0

Abstract

The dielectric properties of complex titanate perovskites are highly sensitive to the composition, which influences the stability of the ferroelectric state. This work examines the role of Zr⁴⁺ and (Mg_1/3Nb_2/3)⁴⁺ doping on the B-site in a high entropy composition based on (Na_0.2Bi_0.2Ba_0.2Ca_0.2Sr_0.2)TiO₃. In particular, (Na_0.2Bi_0.2Ba_0.2Ca_0.2Sr_0.2)(Ti_1−xMe_x)O₃ (Me = Zr⁴⁺, (Mg_1/3Nb_2/3)⁴⁺, x = 0.00–0.15) ceramics are synthesized by solid-state reaction method. All ceramics form a single-phase cubic structure as demonstrated by X-ray diffraction. The difference in ionic radius between Zr⁴⁺ and (Mg_1/3Nb_2/3)⁴⁺ ions contributes to changes in lattice parameter and microstructure. The Zr⁴⁺ doping generally causes lattice expansion, whereas low concentrations of (Mg_1/3Nb_2/3)⁴⁺ doping lead to lattice contraction, resulting in distinct microstructural modifications. For the doped samples, the relative permittivity decreases due to the influence of the dopants when compared with the undoped sample. Furthermore, the dielectric loss decreases substantially to a value below 0.001 across a broad temperature range and the temperature stability of capacitance is enhanced at elevated temperatures. Furthermore, all ceramics with higher Zr⁴⁺ and (Mg_1/3Nb_2/3)⁴⁺ concentrations show linear dielectric behavior with evidence of significant change of electrical characteristics revealed by impedance and modulus analysis. Consequently, the addition of Zr⁴⁺ and (Mg_1/3Nb_2/3)⁴⁺ to the composition (Na_0.2Bi_0.2Ba_0.2Ca_0.2Sr_0.2)TiO₃ shows great promise for high temperature, temperature stable capacitor applications.

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来源期刊

Journal of the American Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

7.50

自引率

7.70%

发文量

590

审稿时长

2.1 months

期刊介绍： The Journal of the American Ceramic Society contains records of original research that provide insight into or describe the science of ceramic and glass materials and composites based on ceramics and glasses. These papers include reports on discovery, characterization, and analysis of new inorganic, non-metallic materials; synthesis methods; phase relationships; processing approaches; microstructure-property relationships; and functionalities. Of great interest are works that support understanding founded on fundamental principles using experimental, theoretical, or computational methods or combinations of those approaches. All the published papers must be of enduring value and relevant to the science of ceramics and glasses or composites based on those materials. Papers on fundamental ceramic and glass science are welcome including those in the following areas: Enabling materials for grand challenges[...] Materials design, selection, synthesis and processing methods[...] Characterization of compositions, structures, defects, and properties along with new methods [...] Mechanisms, Theory, Modeling, and Simulation[...] JACerS accepts submissions of full-length Articles reporting original research, in-depth Feature Articles, Reviews of the state-of-the-art with compelling analysis, and Rapid Communications which are short papers with sufficient novelty or impact to justify swift publication.