Ultralow loss CaMgGeO4 microwave dielectric ceramic and its chemical compatibility with silver electrodes for low-temperature cofired ceramic applications

Xiang, H, Li, C, Jantunen, H, Fang, L and Hill, AE 2018, 'Ultralow loss CaMgGeO4 microwave dielectric ceramic and its chemical compatibility with silver electrodes for low-temperature cofired ceramic applications' , ACS Sustainable Chemistry & Engineering, 6 (5) , pp. 6458-6466.

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Abstract

ABSTRACT: A new ultralow dielectric loss cofired CaMg- GeO₄ dielectric material with olivine structure was fabricated by the solid-state route. The X-ray patterns, Rietveld refinement, and microstructure revealed the characteristics of the synthesized material. CaMgGeO₄ ceramic belongs to the orthorhombic system with a Pbmn space group. Sintered at 1300°C for 6h, the ceramic exhibited a densification of 96.5%, an ultrahigh quality factor (Q × f) of 124 900 GHz (tan δ = 1.24 × 10⁻⁴) at a frequency of 15.5 GHz, a permittivity (ε_r) of 6.71, and a temperature coefficient of resonant frequency (τ_f) of −73.7 ppm/°C, and the average coefficient of thermal expansion of CaMgGeO₄ was 12.4 ppm/°C. The sintering temperature of the CaMgGeO₄ ceramic was reduced from 1300 to 940 °C with the addition of 5 wt % B2O3. The CaMgGeO₄ + 5 wt % B₂O₃ ceramics exhibited favorable microwave dielectric performances: Q × f = 102,000 GHz (at 16.4 GHz), ε_r = 5.80, and τ_f = −64.7 ppm/°C, respectively. In addition, the CaMgGeO₄ ceramic did not react with Ag electrodes, which could be advantageous in low-temperature cofired ceramic multilayer microwave devices.
KEYWORDS: Microwave dielectric properties, CaMgGeO₄, LTCC, ultralow dielectric loss

Item Type:	Article
Schools:	Schools > School of Computing, Science and Engineering
Journal or Publication Title:	ACS Sustainable Chemistry & Engineering
Publisher:	ACS Publications
ISSN:	2168-0485
Related URLs:	Publication
Depositing User:	AE Hill
Date Deposited:	09 Apr 2018 10:11
Last Modified:	27 Aug 2021 21:08
URI:	https://usir.salford.ac.uk/id/eprint/46615

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