Calcium stannate dielectrics compacted by spark plasma sintering

IF 3.9 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

Abstract

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.