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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.115  No.1348 (December) (2007)  >  pp.978-981

Journal of the Ceramic Society of Japan
<<Previous article Vol.115  No.1348 (December) (2007)   pp.978 - 981 Next article>>

Improvement of Temperature Coefficient of Frequency in Ba-deficient Ba5Nb4O15 Microwave Dielectrics

Yeon Hwa JO1), Dong Joo SHIN1), Viswanathan S. SAJI1), Ravindra K. GUPTA1), Hee Soo LEE2) and Yong Soo CHO1)
1) Department of Materials Science and Engineering, Yonsei University
2) School of Materials Science and Engineering, Pusan National University


  Ba-deficient non-stoichiometric compositions of Ba5-xNb4O15-x (x=0 to 0.5) have been investigated for the purpose of improving microwave dielectric properties. While there was no significant variation in dielectric constant, variations in Q×f and TCF (temperature coefficient of frequency) values with the degree of Ba deficiency were prominent. Near zero TCF value was obtained for the composition of Ba4.77Nb4O14.77. The apparent formation of a second BaNb2O6 phase for the Ba-deficient compositions was believed as responsible for the improved TCF. It was interesting to note that the second phase was present more preferably inside of the sample.



Keyword:
Microwave dielectrics, Ba5Nb4O15, BaNb2O6, TCF

Received: September 01, 2007
Accepted: October 18, 2007 , Published online: December 01, 2007
Copyright (c) 2007 The Ceramic Society of Japan

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