Effects of sintering temperature on CaO-Li 2O-Sm 2O 3-TiO 2 microwave dielectric ceramic

C. L. Huang, J. T. Tsai

Research output: Contribution to journalArticle

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Abstract

The effects of sintering temperature on the microwave dielectric properties and the microstructure of CaO- Li 2O-Sm 2O 3-TiO 2 ceramics were investigated. CaO-Li 2O-Sm 2O 3-TiO 2 with the composition CaO : LiO 2 : Sm 2O 3 : TiO 2 = 16 : 9 : 12 : 63 was previously proposed as an excellent microwave dielectric material. Although the proposed composition was reported to consist of the perovskite phase with residual TiO 2 as the second phase, the X-ray reflection lines of TiO 2 were not detected in our specimens. The structure of our specimen was that of an orthorthomic perovskite throughout the entire range of sintering temperature (1250°C ∼ 1370°C). The dielectric properties were found to strongly depend on the sintering conditions. The dielectric constant and temperature coefficient for the resonant frequency were found to decrease as the sintering temperature increased, while the Q.f value exhibited a different trend: The material showed a maximum Q.f value of 5700 (GHz) for sintering at 1310°C. At 1350°C, the dielectric properties with an ε r value of 102, a Q.f value of 5150 and a T f value of 8 ppm/°C were suggested for practical applications.

Original languageEnglish
Pages (from-to)317-321
Number of pages5
JournalProceedings of the National Science Council, Republic of China, Part A: Physical Science and Engineering
Volume25
Issue number5
Publication statusPublished - 2001 Sep 1

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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