Microwave dielectric mechanism studied by microwave near-field microscopy and Raman spectroscopy

Yi Chun Chen, Yeong Der Yao, Yun Shuo Hsieh, Hsiu Fung Cheng, Chih Ta Chia, I. Nan Lin

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Microwave dielectric ceramics such as Ba(Mg1/3Ta 2/3)O3 and Ba2Ti9O20 possess high dielectric constant and low dielectric loss in microwave frequency regime and have tremendous potential for device applications. In these materials, the presence of extrinsic defects, such as secondary phases, usually altered the microwave dielectric properties of the materials markedly, but the correlation of the microwave dielectric response of the materials with their microstructure has not been fully understood due to the lack of dielectric response in the local area. In this article, microwave near-field microscopy and Raman spectroscopy were used to investigate the microwave dielectric mechanism, viz. we measured the microwave dielectric properties of the materials in micron region by using a evanescent microwave probe (EMP) and, at the same time, examined the lattice vibration characteristics of the region by using a micro-Raman spectrum. How the presence of the secondary phase affects the microwave dielectric properties of the materials is thus systematically investigated. The causes of intrinsic or extrinsic dielectric loss were explored by comparing the dielectric images in SEMP at microwave frequencies and the corresponding Raman Spectra.

Original languageEnglish
Pages (from-to)281-286
Number of pages6
JournalJournal of Electroceramics
Volume13
Issue number1-3
DOIs
Publication statusPublished - 2004 Jul 1

Keywords

  • Evanescent microwave microscopy
  • Microwave dielectrics
  • Raman spectroscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Mechanics of Materials
  • Electrical and Electronic Engineering
  • Materials Chemistry

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