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Microwave dielectric properties and applications of rare-earth aluminates

Published online by Cambridge University Press:  26 July 2012

Seo-Yong Cho ,
In-Tae Kim  and
Kug Sun Hong
Seo-Yong Cho
Affiliation:
School of Materials Science and Engineering, Seoul National University, Seoul, 151-742, Korea
In-Tae Kim
Affiliation:
Ceramics Division, Korea Institute of Science and Technology, P.O. Box 131, Cheongryang, Seoul, Korea
Kug Sun Hong
Affiliation:
School of Materials Science and Engineering, Seoul, National University, Seoul, 151-742, Korea
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Extract

Rare-earth aluminates, LnAlO3 (Ln = Dy, Er, Gd, La, Nd, Pr, Sm, and Y) were prepared using the mixed oxide method, and their microwave dielectric properties were examined at X-band. Most rare-earth aluminates have suitable permittivities and quality factors for applications as dielectric resonators, but a modification of τf is necessary due to the coefficient's large negative value. When considering dielectric properties and lattice matching, YalO3 rather than LaAlO3, was suggested as a promising substrate material for microstrip antennas utilizing high-temperature superconductor thin films. Rare-earth aluminates with a rhombohedral structure exhibited larger permittivities than those with an orthorhombic structure. This difference was attributed to the difference in ionic size and coordination number. It was demonstrated that a nonzero magnetic susceptibility of rare-earth aluminates has an adverse effect on their quality factor. An abrupt variation in the temperature coefficient of permittivity was discussed in terms of oxygen octrahedra tilting.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 1 , January 1999 , pp. 114 - 119
Copyright
Copyright © Materials Research Society 1999

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References

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