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Issue 24, 2017
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Novel water insoluble (NaxAg2−x)MoO4 (0 ≤ x ≤ 2) microwave dielectric ceramics with spinel structure sintered at 410 degrees

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Abstract

In the present work, a novel series of water insoluble ultra-low temperature firing (Na,Ag)2MoO4 microwave dielectrics were prepared via the traditional solid state reaction method. A spinel structured solid solution was formed in the full composition range in the (NaxAg2−x)MoO4 (0 ≤ x ≤ 2). As x increased from 0 to 2.0, cell volume decreased linearly from 9.32 Å to 9.10 Å. Sintering behavior were described using a so-called ‘bowing’ effect and densification was achieved below 420 °C for 0.5 ≤ x ≤ 1.2 with grain size, 1 to 5 μm. Optimum microwave dielectric properties were obtained for (Na1.2Ag0.8)MoO4 ceramics sintered at 410 °C with a permittivity ∼8.1, a microwave quality factor ∼44 800 GHz and the temperature coefficient of the resonant frequency ∼−82 ppm °C−1 at 13.9 GHz. Silver within the solid solution inhibited hydrolyzation of ceramics and also reduced their sintering temperature. Compared with the sintering temperatures of traditional microwave dielectric ceramic (Al2O3, >1400 °C) and normal low temperature co-fired ceramics (<960 °C), this system will save lots of energy during processing and accelerate developments of sustainable electronic materials and devices.

Graphical abstract: Novel water insoluble (NaxAg2−x)MoO4 (0 ≤ x ≤ 2) microwave dielectric ceramics with spinel structure sintered at 410 degrees

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Publication details

The article was received on 19 Apr 2017, accepted on 31 May 2017 and first published on 01 Jun 2017


Article type: Paper
DOI: 10.1039/C7TC01718A
Citation: J. Mater. Chem. C, 2017,5, 6086-6091
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    Novel water insoluble (NaxAg2−x)MoO4 (0 ≤ x ≤ 2) microwave dielectric ceramics with spinel structure sintered at 410 degrees

    D. Zhou, J. Li, L. Pang, D. Wang and I. M. Reaney, J. Mater. Chem. C, 2017, 5, 6086
    DOI: 10.1039/C7TC01718A

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