TY - JOUR
T1 - Microwave dielectric properties of ultra-low-temperature-sintered TiO2 as a τf compensator
AU - Hsu, Tsung Hsien
AU - Huang, Cheng Liang
N1 - Funding Information:
This work was financially sponsored by the Ministry of Science and Technology of Taiwan under the projects MOST 110-2221-E-006-032-MY2 and MOST 111-2221-E-006-164-MY2. The authors would like to thank Ms. Hui–Jung Shih with the Instrument Center of National Cheng Kung University for supporting the use of high-resolution SEM (Hitachi SU8000). The authors also gratefully acknowledge the use of D8 Discover equipment belonging to the Instrument Center of National Cheng Kung University.
Funding Information:
This work was financially sponsored by the Ministry of Science and Technology of Taiwan under the projects MOST 110-2221-E-006-032-MY2 and MOST 111-2221-E-006-164-MY2. The authors would like to thank Ms. Hui–Jung Shih with the Instrument Center of National Cheng Kung University for supporting the use of high-resolution SEM (Hitachi SU8000). The authors also gratefully acknowledge the use of D8 Discover equipment belonging to the Instrument Center of National Cheng Kung University.
Publisher Copyright:
© 2022, The Author(s), under exclusive licence to Springer-Verlag GmbH, DE part of Springer Nature.
PY - 2023/1
Y1 - 2023/1
N2 - 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.
AB - 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.
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U2 - 10.1007/s00339-022-06303-4
DO - 10.1007/s00339-022-06303-4
M3 - Article
AN - SCOPUS:85143595890
SN - 0947-8396
VL - 129
JO - Applied Physics A: Materials Science and Processing
JF - Applied Physics A: Materials Science and Processing
IS - 1
M1 - 20
ER -