4.7 Article

Temperature stability adjustment of cobalt-doped Li2MgSiO4 ceramic: its' sintering, dielectric, and mechanical properties

Journal

JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
Volume 14, Issue -, Pages 1312-1318

Publisher

ELSEVIER
DOI: 10.1016/j.jmrt.2021.07.057

Keywords

Silicate; Low dielectric constant; Dielectric properties; Temperature stability

Funding

  1. National Natural Science Foundation of China [61771104, 62071106]
  2. Jiangxi Innovative Talent Program
  3. Sichuan Science and Technology Program [2021JDTD0026]

Ask authors/readers for more resources

This study investigated the sintering and dielectric properties of (1 - x)Li2Mg0.95Co0.05SiO4 + xTiO(2) ceramics synthesized by the solid state reaction method. The addition of TiO2 was found to improve the grain size, sintering properties, dielectric properties, and relative density of the ceramics.
The sintering and dielectric properties of (1 - x)Li2Mg0.95Co0.05SiO4 + xTiO(2) ceramics created by the solid state reaction method were investigated. X-ray diffraction and energy dispersive X-ray spectroscopy were used to obtain phase composition of the ceramics, and scanning electron microscopy was used to observe their microstructure. A network analyzer was used to measure dielectric properties, while mechanical, simultaneous thermal, and dynamic mechanical analyzers were used to obtain mechanical and chemical properties. Li2Mg0.95Co0.05SiO4 (LMCS) and TiO2 co-exist in the composite system. TiO2 addition resulted in decreasing grain size and crystallite size, increasing starting temperature of shrinkage, increasing activation energy, and increasing elasticity and stiffness. A 4%/volume addition of TiO2 and sintering at 1075 degrees C changed the LMCS tau(f) to 1.57 ppm/degrees C and resulted in dielectric properties of epsilon(r) = 6.33 and Q x f = 17,000 GHz (16 GHz) with a relative density equals to 96.13%. (C) 2021 The Author(s). Published by Elsevier B.V.

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