期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 5, 期 38, 页码 10094-10098出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7tc03623j
关键词
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资金
- Sustainability and Substitution of Functional Materials and Devices EPSRC [EP/L017563/1]
- National Natural Science Foundation of China [U1632146]
- Young Star Project of Science and Technology of Shaanxi Province [2016KJXX-34]
- Key Basic Research Program of Shaanxi Province [2017GY-129]
- Fundamental Research Funds for the Central University
- 111 Project of China [B14040]
- Engineering and Physical Sciences Research Council [EP/L017563/1, EP/N010493/1] Funding Source: researchfish
- EPSRC [EP/N010493/1, EP/L017563/1] Funding Source: UKRI
Bi-2(Li0.5Ta1.5)O-7 + xBi(2)O(3) (x = 0, 0.01 and 0.02) ceramics were prepared using a solid state reaction method. All compositions were crystallized in a single Bi-2(Li0.5Ta1.5)O-7 phase without secondary peaks in X-ray diffraction patterns. Bi-2(Li0.5Ta1.5)O-7 ceramics were densified at 1025 degrees C with a permittivity (epsilon(r)) of similar to 65.1, Q(f) similar to 15500 GHz (Q similar to microwave quality factor; f similar to resonant frequency; 16 780 GHz when annealed in O-2) and the temperature coefficient of resonant frequency (TCF) was similar to -17.5 ppm degrees C-1. The sintering temperature was lowered to similar to 920 degrees C by the addition of 2 mol% excess Bi2O3 (epsilon(r) similar to 64.1, a Q(f) similar to 11200 GHz/11650 GHz when annealed in O-2 and at a TCF of similar to -19 ppm degrees C-1) with compositions chemically compatible with Ag electrodes. Bi-2(Li0.5Ta1.5)O-7 + xBi2O3 are ideal for application as dielectric resonators in 5G mobile base station technology for which ceramics with 60 < epsilon(r) < 70, high Q(f) and close to zero TCF are commercially unavailable. They may additionally prove to be useful as high er and high Q(f) Bi-2(Li0.5Ta1.5)O-7 Bi-2(Li0.5Ta1.5)O-7 materials in low temperature co-fired ceramic (LTCC) technology.
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