用火花等离子烧结压实锡酸钙电介质

IF 4.6 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: B Pub Date : 2025-03-09 DOI:10.1016/j.mseb.2025.118203

Pavel Ctibor , Josef Sedláček , Libor Straka , Petr Veselý , František Lukáč

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引用次数: 0

摘要

本工作的目的是通过火花等离子烧结（SPS）烧结锡酸钙介电陶瓷CaSnO3。该材料难以烧结，主要是由于锡的挥发性。一种半商业粉末产品被SPS整合成散装光盘的形式。热压压力作为主要的可变参数，在30 ~ 80 MPa之间变化。采用显微、物相分析、x射线光电子能谱和显微硬度对烧结体进行了研究。在样品上覆盖电极，测量介电参数，包括直流电阻。相对介电常数和损耗正切值在1 kHz至1 MHz频率范围和30°C至200°C温度范围内非常稳定，没有松弛。发现了烧结参数、微观结构和介电特性之间的联系。在超过30 MPa的压力下烧结的样品表现出可靠的介电体。开发了一种极具发展前景的介质烧结新方法：在1300℃、50 MPa压力下烧结的样品，εr = 28.2；tan(δ) = 0.036, 1mhz时电容热系数TCC = 26 ppm/K。讨论了空位和离子价态修饰的影响。

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Calcium stannate dielectrics compacted by spark plasma sintering

The aim of this work was to sinter calcium stannate dielectric ceramics, CaSnO₃, via spark plasma sintering (SPS). The material is difficult to sinter, mainly because of Sn volatility. A semi-commercial powder product was consolidated into a form of bulk discs by SPS. As the main variable parameter, the hot-compaction pressure varied from 30 MPa to 80 MPa. The as-sintered bulks were studied by microscopy, phase analysis, X-ray photoelectron spectroscopy and microhardness. The samples were covered with electrodes and dielectric parameters were measured, including DC resistance. Relative permittivity and loss tangent values for the frequency range 1 kHz to 1 MHz and the temperature range 30 °C to 200 °C were very stable with no relaxation. Connections between the sintering parameters, microstructure and dielectric characteristics were found. Samples sintered at the pressure over 30 MPa behaved like reliable dielectrics. A novel approach to sintering of very promising dielectrics was developed: The sample sintered at 1300 °C using 50 MPa pressure exhibited very interesting values, ε_r = 28.2; tan(δ) = 0.036 and thermal coefficient of capacitance TCC = 26 ppm/K at 1 MHz. The influence of vacancies and ion valence modifications was discussed.

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来源期刊

Materials Science and Engineering: B 工程技术-材料科学：综合

CiteScore

5.60

自引率

2.80%

发文量

481

审稿时长

3.5 months

期刊介绍： The journal provides an international medium for the publication of theoretical and experimental studies and reviews related to the electronic, electrochemical, ionic, magnetic, optical, and biosensing properties of solid state materials in bulk, thin film and particulate forms. Papers dealing with synthesis, processing, characterization, structure, physical properties and computational aspects of nano-crystalline, crystalline, amorphous and glassy forms of ceramics, semiconductors, layered insertion compounds, low-dimensional compounds and systems, fast-ion conductors, polymers and dielectrics are viewed as suitable for publication. Articles focused on nano-structured aspects of these advanced solid-state materials will also be considered suitable.