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Microstructure and properties of ZnO doped CaO–Al2O3–SiO2 ceramic for LTCC applications

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Abstract

A low temperature co-fired ceramic based on the CaO–Al2O3–SiO2 system was prepared by traditional solid-state process. The effects of increasing replacement of SiO2 by ZnO on the sintering, mechanical, thermal and dielectric properties were investigated. X-ray diffraction results showed that anorthite was the major crystalline phase. The results revealed that the addition of ZnO could augment the degree of crystallinity but excess ZnO content would worsen the porosity of the ceramics. The specimen sintered at 900 °C for 2 h, with 2.5 wt% ZnO addition, attained optimal properties: a good density of 2.495 g/cm3, high bending strength of 125 MPa, excellent dielectric properties (dielectric constant: 5.8, dielectric loss: 3.4 × 10−3), high resistivity (ρ > 1012 Ω cm) and a low CTE of 5.97 ppm/°C, matching that of GaAs. It was shown that the prepared ceramic could meet the property requirements for low temperature co-fired ceramic applications.

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Authors and Affiliations

  1. School of Microelectronics and Solid State Electronics, University of Electronic Science and Technology of China, Chengdu, 610054, People’s Republic of China

    Zhenjun Qing, Bo Li, Yingxiang Li, Hao Li & Shuren Zhang

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  1. Zhenjun Qing
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  2. Bo Li
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  4. Hao Li
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Correspondence to Zhenjun Qing.

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Qing, Z., Li, B., Li, Y. et al. Microstructure and properties of ZnO doped CaO–Al2O3–SiO2 ceramic for LTCC applications. J Mater Sci: Mater Electron 26, 1512–1517 (2015). https://doi.org/10.1007/s10854-014-2569-8

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  • DOI: https://doi.org/10.1007/s10854-014-2569-8

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