Study and manufacturing of strontium calcium titanate lead-free ceramic capacitors for high-frequency applications

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS Journal of Sol-Gel Science and Technology Pub Date : 2024-06-17 DOI:10.1007/s10971-024-06433-6

Parthiban Palani, Amina Tachafine, Christophe Poupin, Didier Fasquelle

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Abstract

SrTiO₃ based lead-free ceramics has enormous potential for dielectric capacitors. This work focuses on the fabrication of small size Sr_1-xCa_xTiO₃ (SCT) ceramic capacitors. Initially, the ceramics with a high doping concentration of 0.36 ≤ x ≤ 0.40 were prepared using the sol-gel method and characterized for their structural, morphological (grain), and dielectric properties. An increase in calcium doping concentration revealed a notable decline in the dielectric dissipation factor. Further, small size ceramic capacitors with ≈ 1mm² dimensions were micro-machined in order to replicate the size of high-frequency commercial capacitors and to emphasize the real potential of this class of ceramics for dielectric capacitors. The dielectric properties, measured from 100 Hz to 1 GHz, such as permittivity (ε′), loss tangent (tgδ), and quality coefficient (Q) revealed that these materials could have a great interest in the development of monolithic ceramic capacitors dedicated to a very large frequency range from 100 Hz to 1 GHz applications.

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研究和制造用于高频应用的钛酸锶钙无铅陶瓷电容器

基于 SrTiO3 的无铅陶瓷在电介质电容器方面具有巨大潜力。这项工作的重点是制造小尺寸 Sr1-xCaxTiO3 (SCT) 陶瓷电容器。最初，采用溶胶-凝胶法制备了高掺杂浓度（0.36 ≤ x ≤ 0.40）的陶瓷，并对其结构、形态（晶粒）和介电特性进行了表征。随着钙掺杂浓度的增加，介质损耗因子明显下降。此外，还对尺寸≈ 1 平方毫米的小尺寸陶瓷电容器进行了微加工，以复制高频商用电容器的尺寸，并强调这类陶瓷在电介质电容器方面的真正潜力。在 100 Hz 至 1 GHz 范围内测量的介电性能，如介电常数 (ε′)、损耗正切 (tgδ) 和品质系数 (Q) 表明，这些材料在开发专用于 100 Hz 至 1 GHz 大频率范围应用的单片陶瓷电容器方面具有重大意义。

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来源期刊

Journal of Sol-Gel Science and Technology 工程技术-材料科学：硅酸盐

CiteScore

4.70

自引率

4.00%

发文量

280

审稿时长

2.1 months

期刊介绍： The primary objective of the Journal of Sol-Gel Science and Technology (JSST), the official journal of the International Sol-Gel Society, is to provide an international forum for the dissemination of scientific, technological, and general knowledge about materials processed by chemical nanotechnologies known as the "sol-gel" process. The materials of interest include gels, gel-derived glasses, ceramics in form of nano- and micro-powders, bulk, fibres, thin films and coatings as well as more recent materials such as hybrid organic-inorganic materials and composites. Such materials exhibit a wide range of optical, electronic, magnetic, chemical, environmental, and biomedical properties and functionalities. Methods for producing sol-gel-derived materials and the industrial uses of these materials are also of great interest.