Improved temperature coefficient of resistivity in La0.67Ca0.25-xSr0.08AgxMnO3 (0.06 ≤ x ≤ 0.12) polycrystalline ceramics via Ag doping

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

Journal of the American Ceramic Society Pub Date : 2025-02-22 DOI:10.1111/jace.20456

Jiachen Wang, Jiankun Sun, Zihao Chen, Yao Wang, Jiamei Han, Haitao Wang, Xiaolu Liang, Zhenyu Wang, Zimeng Pan, Jun Ma, Xuexing Jiang, Xin Gu, Xiang Liu

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引用次数: 0

Abstract

Oxides with perovskite structures have received extensive research attention due to their fascinating physical properties. In this study, polycrystalline ceramics of La_0.67Ca_0.25-_xSr_0.08Ag_xMnO₃ (LCSAMO, x = 0.06, 0.08, 0.10, and 0.12) were obtained by changing the previous sol-gel preparation process parameters. The results show that LCSAMO ceramics are orthogonal perovskite structures with a space group of Pnma. With increasing x, the grain size, lattice constants, Mn-O bond length (d_Mn-O), and Mn-O-Mn bond Angle (θ_Mn-O-Mn) are slightly affected. When x = 0.08, the average grain size achieved a maximum value of 8.84 µm, which enhanced the intergranular connectivity. The Mn⁴⁺/(Mn³⁺+Mn⁴⁺) ratio was the maximum value of 30.26% when x = 0.08, where the double exchange (DE) mechanism was the strongest among the four samples and optimized the electrical transport properties. Ag doping induces distortion in MnO₆ octahedron. The electrical transport properties of the ceramics were improved by the combined effect of the distortion and DE mechanism. The temperature coefficient of resistivity (TCR) achieved the maximum value of 24.07% K⁻¹ at 284.91 K. The results of this work provide a theoretical basis for Ag doping at the A-site and thus obtaining lanthanide perovskite manganese oxide with high TCR.

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Ag掺杂提高了La0.67Ca0.25-xSr0.08AgxMnO3（0.06≤x≤0.12）多晶陶瓷的电阻率温度系数

具有钙钛矿结构的氧化物由于其令人着迷的物理性质而受到广泛的研究关注。本研究通过改变先前溶胶-凝胶制备工艺参数，获得La0.67Ca0.25-xSr0.08AgxMnO3 （LCSAMO, x = 0.06, 0.08, 0.10, 0.12）的多晶陶瓷。结果表明，LCSAMO陶瓷是具有Pnma空间群的正交钙钛矿结构。随着x的增大，晶粒尺寸、晶格常数、Mn-O键长（dMn-O）和Mn-O- mn键角（θMn-O-Mn）受影响较小。当x = 0.08时，平均晶粒尺寸达到最大值8.84µm，增强了晶间连通性。当x = 0.08时，Mn4+/(Mn3++Mn4+)比达到最大值30.26%，双交换机制最强，优化了电输运性能。Ag掺杂引起MnO6八面体畸变。在畸变和DE机制的共同作用下，陶瓷的电输运性能得到了改善。电阻率温度系数（TCR）在284.91 K时达到最大值，为24.07% K−1。本研究结果为在a位掺杂Ag从而获得高TCR的镧系钙钛矿型氧化锰提供了理论基础。

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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.