Microwave Dielectric Properties of Bi2(Zn1/3Ta2/3)2O7 Polymorphs

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概要

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• Polymorphic phases of Bi2(Zn1/3Ta2/3)2O7 pyrochlore were studied. A metastable monoclinic structure was observed at temperatures below 950°C. This low-temperature phase possesses highly temperature-stable characteristics in the microwave frequency range (5–7 GHz) with a temperature coefficient of resonant frequency $(\tau_{\text{f}})=-8.8$ ppm/°C. The addition of B2O3 to Bi2(Zn1/3Ta2/3)2O7 significantly lowered the sintering temperature, to 850°C, without an associated structural transition. Low-temperature sintering mechanisms have been investigated using dilatometry and transmission electron microscopy. Bi2(Zn1/3Ta2/3)2O7 with 0.5 wt% B2O3 can be suitable for application in low-temperature cofired ceramics (LTCC), due to its reduced sintering temperature and good microwave dielectric properties: quality factor $(Q\times f)=3500$ GHz at 6.7 GHz, dielectric constant $(\varepsilon_{\text{r}})=63.9$ and $\tau_{\text{f}}=-14.1$ ppm/°C.

• 2003-08-15

著者

• Kim Dong-wan

  School Of Material Sciences & Engineering Seoul National University

• Hong Hee

  School Of Materials Science And Engineering College Of Engineering Seoul National University

• Hong Kug

  School Of Material Sciences & Engineering Seoul National University

• Kim Dong-Wan

  School of Materials Science and Engineering, College of Engineering, Seoul National University, Seoul, Korea

• Hong Kug

  School of Materials Science and Engineering, College of Engineering, Seoul National University, Seoul, Korea

• Hong Hee

  School of Materials Science and Engineering, College of Engineering, Seoul National University, Seoul, Korea

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