Improvement of temperature coefficient of frequency in Ba-deficient Ba 5Nb4O15 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

Improvement of temperature coefficient of frequency in Ba-deficient Ba ₅Nb₄O₁₅ microwave dielectrics

Yeon Hwa Jo, Dong Joo Shin, Viswanathan S. Saji, Ravindra K. Gupta, Hee Soo Lee, Yong Soo Cho

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

Ba-deficient non-stoichiometric compositions of Ba_5-xNb ₄O_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.

Original language	English
Pages (from-to)	978-981
Number of pages	4
Journal	Journal of the Ceramic Society of Japan
Volume	115
Issue number	1348
DOIs	https://doi.org/10.2109/jcersj2.115.978
Publication status	Published - 2007 Dec

All Science Journal Classification (ASJC) codes

Ceramics and Composites
Chemistry(all)
Condensed Matter Physics
Materials Chemistry

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10.2109/jcersj2.115.978

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title = "Improvement of temperature coefficient of frequency in Ba-deficient Ba 5Nb4O15 microwave dielectrics",

abstract = "Ba-deficient non-stoichiometric compositions of Ba5-xNb 4O15-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 4.77Nb4O14.77. 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.",

author = "Jo, {Yeon Hwa} and Shin, {Dong Joo} and Saji, {Viswanathan S.} and Gupta, {Ravindra K.} and Lee, {Hee Soo} and Cho, {Yong Soo}",

year = "2007",

month = dec,

doi = "10.2109/jcersj2.115.978",

language = "English",

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pages = "978--981",

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T1 - Improvement of temperature coefficient of frequency in Ba-deficient Ba 5Nb4O15 microwave dielectrics

AU - Jo, Yeon Hwa

AU - Shin, Dong Joo

AU - Saji, Viswanathan S.

AU - Gupta, Ravindra K.

AU - Lee, Hee Soo

AU - Cho, Yong Soo

PY - 2007/12

Y1 - 2007/12

N2 - Ba-deficient non-stoichiometric compositions of Ba5-xNb 4O15-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 4.77Nb4O14.77. 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.

AB - Ba-deficient non-stoichiometric compositions of Ba5-xNb 4O15-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 4.77Nb4O14.77. 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.

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JO - Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan

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Improvement of temperature coefficient of frequency in Ba-deficient Ba ₅Nb₄O₁₅ microwave dielectrics

Abstract

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