Microwave dielectric properties of ultra-low-temperature-sintered TiO2 as a τf compensator

Tsung Hsien Hsu, Cheng Liang Huang

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1 Citation (Scopus)

Abstract

TiO2 ceramics synthesized from the rutile TiO2 powders with a mean size of ~ 0.4 μm were sintered at temperatures ranging from 500 to 1300 °C. The diffraction peaks matched well with the pure rutile phase. Grain growth is an important factor of densification and it becomes significant at 800–1300 °C, suggesting that the sintering process likely moves into the intermediate stage. The density renders a value of 97.5% at 1300 °C and starts to bend suggesting that the sintering is reaching its final stage. A thermostable and wide process window can be achieved for TiO2 specimen sintered at 500–800 °C, and it exhibits an εr of 21.7–28.18.8, a Q × f of 11,700–14,600 GHz, a τf of 383–390 ppm/°C, respectively. Not only did it provide a large positive τf, the rutile-TiO2 also rendered a stable and wide process window, suggesting that the proposed TiO2 ceramic can be a promising candidate for use as a τf compensator for ultra-low-temperature co-fired ceramics (ULTCC) materials and the microwave dielectric properties of ULTCC + TiO2 ceramics may be predictable through the mixing rules.

Original languageEnglish
Article number20
JournalApplied Physics A: Materials Science and Processing
Volume129
Issue number1
DOIs
Publication statusPublished - 2023 Jan

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Materials Science

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