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High permittivity, low loss microwave dielectrics suitable for 5G resonator and low temperature co-fired ceramic architecture

Abstract

Bi2(Li0.5Ta1.5)O7+xBi2O3 (x=0, 0.01 and 0.02) ceramics were prepared using a solid state reaction method. All compositions crystallized in a single Bi2(Li0.5Ta1.5)O7 phase without secondary peaks in X-ray diffraction patterns. Bi2(Li0.5Ta1.5)O7 ceramics densified at 1025 oC with a permittivity (εr) ~ 65.1, Qf ~ 15,500 GHz (Q ~ microwave quality factor; f ~ resonant frequency; 16,780 GHz when annealed in O2) and temperature coefficient of resonant frequency (TCF) ~ −17.5 ppm/oC. The sintering temperature was lowered to ~ 920 oC by the addition of 2 mol. % excess Bi2O3 (εr ~ 64.1, a Qf ~11,200 GHz / 11,650 GHz when annealed in O2 and a TCF ~ − 19 ppm/oC) with compositions chemically compatible with Ag electrodes. Bi2(Li0.5Ta1.5)O7+xBi2O3 are ideal for applications as dielectric resonators in 5G mobile base station technology for which ceramics with 60 r < 70, high Qf and close to zero TCF are commercially unavailable. They may additionally prove useful as high r, high Qf materials in low temperature co-fired ceramic (LTCC) technology.

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Publication details

The article was received on 10 Aug 2017, accepted on 09 Sep 2017 and first published on 09 Sep 2017


Article type: Paper
DOI: 10.1039/C7TC03623J
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    High permittivity, low loss microwave dielectrics suitable for 5G resonator and low temperature co-fired ceramic architecture

    D. Zhou, L. Pang, D. Wang, C. Li, B. Jin and I. M. Reaney, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC03623J

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