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- W1974460356 abstract "Abstract The tungstenbronze-type like Ba 6−3 x R 8+2 x Ti 18 O 54 (R=rare earth) solid solutions have excellent microwave dielectric properties. In particular, Nd-system materials have high dielectric constant ( e r ) around 80 and high quality factor ( Q · f ) near 10 000 GHz. However, the temperature coefficients of the resonant frequency, τ f , is very poor, 63 ppm °C −1 for use as practical microwave material. We have investigated the effects of substituting Bi ions in Ba 6−3 x R 8+2 x Ti 18 O 54 ( x =2/3) solid solutions in terms of the lattice parameters, and phase structures. It seems that until y =0.05, Bi ions substituted for Ba ions. Thereafter, Bi ions substituted for Nd ions from y =0.05 to 0.3. As y increased, the dielectric constant, e r , increased and the quality factor, Q · f , decreased. The temperature coefficients of the resonant frequency, τ f , improved to 17 ppm °C −1 at y =0.15." @default.
- W1974460356 created "2016-06-24" @default.
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- W1974460356 date "2002-01-01" @default.
- W1974460356 modified "2023-10-16" @default.
- W1974460356 title "Site occupancy of Bi ions and microwave dielectric properties in Ba6−3xNd8+2xTi18O54 solid solutions" @default.
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- W1974460356 doi "https://doi.org/10.1016/s0921-5107(01)00748-6" @default.
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