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- Title
Phase Compositions and Microwave Dielectric Properties of Na 1+x SrB 5 O 9+0.5x Ceramics.
- Authors
Lu, Xuepeng; Wu, Peng; Yang, Huimin; Yang, Min; Zheng, Yong
- Abstract
Microwave dielectric ceramics composed of Na1+xSrB5O9+0.5x (0 ≤ x ≤ 0.125) were synthesized via a traditional solid-state reaction approach. The effects of non-stoichiometric Na on the crystal structures, phase compositions, chemical bond characteristics, and microwave dielectric properties of the Na1+xSrB5O9+0.5x ceramics were systematically studied. All Na1+xSrB5O9+0.5x ceramics sintered at optimum temperatures consisted of a NaSrB5O9 solid-solution phase and a SrB2O4 phase. Appropriate excess Na could suppress the generation of the SrB2O4 phase, and the lowest content of the SrB2O4 phase was achieved at x = 0.075. The εr values of the Na1+xSrB5O9+0.5x ceramics were primarily affected by the relative density and molecular polarization. The Q × f values showed a positive correlation with the lattice energy. The τf value was correlated to the SrB2O4 phase content, bond valence, and bond energy. Typically, the Na1.075SrB5O9.0375 ceramic sintered at 825 °C possessed good microwave dielectric properties of εr = 5.61, Q × f = 31, 937 GHz, and τf = −3.09 ppm/°C, which are suitable for high-frequency, low-temperature co-fired ceramics (LTCCs) substrate applications.
- Subjects
CERAMICS; MICROWAVES; DIELECTRIC properties; SPECIFIC gravity; VALENCE bonds; CHEMICAL bonds; CRYSTAL structure
- Publication
Crystals (2073-4352), 2023, Vol 13, Issue 7, p1042
- ISSN
2073-4352
- Publication type
Article
- DOI
10.3390/cryst13071042