CONTROLLED TEMPERATURE COEFFICIENT OF RESONANT FREQUENCY OF Al2O3-TiO2 CERAMICS BY ANNEALING TREATMENT

The microwave dielectric properties of alumina (Al2O3) ceramics were studied. The objective was to improve the large negative temperature coefficient of resonant frequency (tf = -60 ppm/C) of Al2O3 ceramics by the adding rutile (TiO2) with a large positive tf (+450 ppm/C). A near-zero tf (tf = +1.5...

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Published inJpn.J.Appl.Phys ,Part 2. Vol. 43, no. 6A, pp. L749-L751. 2004 Vol. 43; no. 6A; pp. L749 - L751
Main Authors Ohishi, Y, Miyauchi, Y, Ohsato, H, Kakimoto, K
Format Journal Article
LanguageEnglish
Published 01.01.2004
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Summary:The microwave dielectric properties of alumina (Al2O3) ceramics were studied. The objective was to improve the large negative temperature coefficient of resonant frequency (tf = -60 ppm/C) of Al2O3 ceramics by the adding rutile (TiO2) with a large positive tf (+450 ppm/C). A near-zero tf (tf = +1.5 ppm/C) with excellent microwave dielectric properties was obtained in 0.9Al2O3-0.1TiO2 ceramics sintered at 1350 C for 2 h, followed by annealing at 1000 C for 2 h in air. 12 refs.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
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content type line 23
ISSN:0021-4922
DOI:10.1143/JJAP.43.L749