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Microwave dielectric properties of Ca[(Li1/3Nb2/3)1−xMx]O3−δ (M = Sn, Ti) ceramics

Published online by Cambridge University Press:  31 January 2011

Ji-Won Choi
Affiliation:
Thin Film Technology Research Center, Korea Institute of Science and Technology, Seoul 130–650, Korea
Chong-Yun Kang
Affiliation:
Thin Film Technology Research Center, Korea Institute of Science and Technology, Seoul 130–650, Korea
Seok-Jin Yoon
Affiliation:
Thin Film Technology Research Center, Korea Institute of Science and Technology, Seoul 130–650, Korea
Hyun-Jai Kim
Affiliation:
Thin Film Technology Research Center, Korea Institute of Science and Technology, Seoul 130–650, Korea
Hyung-Jin Jung
Affiliation:
Thin Film Technology Research Center, Korea Institute of Science and Technology, Seoul 130–650, Korea
Ki Hyun Yoon
Affiliation:
Department of Ceramic Engineering, Yonsei University, Seoul 120–749, Korea
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Abstract

The microwave dielectric properties of Ca[(Li1/3Nb2/3)1−xMx]O3−δ (M = Sn, Ti, 0 ≤ x ≤ 0.5) ceramics were investigated. In general, the ceramics prepared were multiphase materials. However, single-phase specimens having orthorhombic perovskite structure similar to CaTiO3 could be obtained in the vicinity of Sn = 0.2 to 0.3, and Ti = 0.2. As Sn concentration increased, the dielectric constant (εr) decreased and the quality factor (Q) significantly increased within the limited Sn concentration. As Ti concentration increased, the dielectric constant (εr) increased, the quality factor (Q) decreased, and the temperature coefficient of resonant frequency (τf) changed from a negative to positive value. The temperature coefficient of resonant frequency of 0 ppm/°C was realized at Ti = 0.2. The Q · fo value and εr for this composition were found to be 26100 GHz and 38.6, respectively.

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Copyright
Copyright © Materials Research Society 1999

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References

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Microwave dielectric properties of Ca[(Li1/3Nb2/3)1−xMx]O3−δ (M = Sn, Ti) ceramics
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