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J. Korean Ceram. Soc. > Volume 40(4); 2003 > Article
Journal of the Korean Ceramic Society 2003;40(4): 340.
doi: https://doi.org/10.4191/kcers.2003.40.4.340
Microwave Dielectric Properties of Bi2O3-TiO2 Composite Ceramics
Anna-karin Axelsson, Maladil Sebastian, Neil McN Alford
Physical Electronics and Materials, South Bank University
B $i_2$ $O_3$-Ti $O_2$ composite dielectric ceramics have been prepared by a conventional solid state ceramic route. The composite ceramics were prepared with starting materials of different origin and the microwave dielectric properties were investigated. The sintered ceramics were characterized by X-ray diffraction, scanning electron microscopy, energy dispersive X-ray microanalysis, Raman and microwave methods. Structural and microstructural analyses identified two separate phases: Ti $O_2$(rutile) and B $i_2$ $Ti_4$0$_{11}$. The separate grains of titania and bismuth titanate were distributed uniformly in the ceramic matrix. The composition 0.88Ti $O_2$-0.12B $i_2$ $Ti_4$ $O_{11}$ was found to have a Q$times$f of 9300 GHz (measured at a frequency of 3.9 GHz), a temperature coefficient of frequency, $tau$$_{cf}$ near zero and a high relative permittivity, $varepsilon$r of 83. The microwave dielectric properties were measured down to 20$^{circ}$K K. The quality factor increased on cooling the ceramic samples.les.
Key words: Dielectric ceramics, Microwave material, Bismuthtitanate, $Bi_2$$O_3$, $TiO_2$
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