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

Research output: Contribution to journalArticle

3 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)978-981
Number of pages4
JournalJournal of the Ceramic Society of Japan
Volume115
Issue number1348
DOIs
Publication statusPublished - 2007 Jan 1

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Microwaves
microwaves
coefficients
Chemical analysis
Dielectric properties
Temperature
temperature
dielectric properties
Permittivity
permittivity

All Science Journal Classification (ASJC) codes

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

Cite this

Jo, Yeon Hwa ; Shin, Dong Joo ; Saji, Viswanathan S. ; Gupta, Ravindra K. ; Lee, Hee Soo ; Cho, Yong Soo. / Improvement of temperature coefficient of frequency in Ba-deficient Ba 5Nb4O15 microwave dielectrics. In: Journal of the Ceramic Society of Japan. 2007 ; Vol. 115, No. 1348. pp. 978-981.
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Improvement of temperature coefficient of frequency in Ba-deficient Ba 5Nb4O15 microwave dielectrics. / Jo, Yeon Hwa; Shin, Dong Joo; Saji, Viswanathan S.; Gupta, Ravindra K.; Lee, Hee Soo; Cho, Yong Soo.

In: Journal of the Ceramic Society of Japan, Vol. 115, No. 1348, 01.01.2007, p. 978-981.

Research output: Contribution to journalArticle

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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

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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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