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A textured barium niobate with enhanced temperature stability of dielectric constant for high-frequency applications

Published online by Cambridge University Press:  03 March 2011

Dong-Wan Kim ,
Byung-Kook Kim ,
Hae-June Je ,
Jae-Gwan Park ,
Jeong-Ryeol Kim  and
Kug Sun Hong
Dong-Wan Kim*
Affiliation:
Materials Science and Technology Division, Korea Institute of Science and Technology, Seoul 136-791, Korea
Byung-Kook Kim
Affiliation:
Materials Science and Technology Division, Korea Institute of Science and Technology, Seoul 136-791, Korea
Hae-June Je
Affiliation:
Materials Science and Technology Division, Korea Institute of Science and Technology, Seoul 136-791, Korea
Jae-Gwan Park
Affiliation:
Materials Science and Technology Division, Korea Institute of Science and Technology, Seoul 136-791, Korea
Jeong-Ryeol Kim
Affiliation:
School of Materials Science and Engineering, College of Engineering, Seoul National University, Seoul 151-742, Korea
Kug Sun Hong
Affiliation:
School of Materials Science and Engineering, College of Engineering, Seoul National University, Seoul 151-742, Korea
*
a) Address all correspondence to this author. e-mail: dwkim@kist.re.kr
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Abstract

Ba5Nb4O15 has shown excellent microwave dielectric properties and is under consideration as a low-temperature cofired ceramic material for advanced radio frequency (RF) applications. By combining tape casting and liquid phase upon sintering, sintered Ba5Nb4O15 thick films stacked to form laminates were produced with aligned elongated grains. This texture engineering, correlated with crystallographic orientation, provides remarkably high temperature stability of dielectric constant up to microwave frequency. Crystallographic texture arises in Ba5Nb4O15 induced by the primary consolidation process, hot pressing, and pulsed laser deposition. The dielectric anisotropy could be efficiently obtained in the textured samples, thereby enabling significant feasibility of microwave circuit designs.

Keywords

Dielectric propertiesSinteringTexture
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 9 , September 2006 , pp. 2354 - 2360
Copyright
Copyright © Materials Research Society 2006

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