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

Yeon Hwa JO; Dong Joo SHIN; Viswanathan S. SAJI; Ravindra K. GUPTA; Hee Soo LEE; Yong Soo CHO

doi:10.2109/jcersj2.115.978

Technical reports

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

Yeon Hwa JO, Dong Joo SHIN, Viswanathan S. SAJI, Ravindra K. GUPTA, Hee Soo LEE, Yong Soo CHO

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Keywords: Microwave dielectrics, Ba₅Nb₄O₁₅, BaNb₂O₆, TCF

JOURNAL FREE ACCESS

2007 Volume 115 Issue 1348 Pages 978-981

DOI https://doi.org/10.2109/jcersj2.115.978

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Abstract

Ba-deficient non-stoichiometric compositions of Ba_5-xNb₄O_15-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 Ba_4.77Nb₄O_14.77. 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.

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