Structural characteristics of new high-Q (1-x)(Al1/2Ta1/2)O2-x(Mg1/3Ta2/ 3)O2 (0.2 < x < 1.0) microwave ceramics

Ji Won Choi, Jong Yoon Ha, Chong Yun Kang, Seok Jin Yoon, Hyun Jai Kim, Ki Hyun Yoon

Research output: Contribution to journalArticle

Abstract

The crystal structure and microstructure of microwave dielectric (1-x)(Al1/2Ta1/2)O2-x(Mg1/3Ta2/ 3)O2 (0.2 ≤ x ≤ 1.0) ceramics have been investigated. It is reported in the JCPDS cards that (Al1/2Ta1/2)O2 and (Mg1/3Ta2/3)O2 have orthorhombic and tetragonal structure, respectively. (1-x)(Al1/2Ta1/2)O2-x(Mg1/3Ta2/ 3)O2 ceramics had two phases of orthorhombic and tetragonal at low (Mg1/3Ta2/3)O2 concentration but as (Mg1/3Ta2/3)O2 concentration increased, (1-x)(Al1/2Ta1/2)O2-x(Mg1/3Ta2/ 3)O2 transformed into tetragonal structure. Specimens having tetragonal single phase could be obtained over x = 0.6. As (Mg1/3Ta2/3)O2 concentration increased, the cell parameters, X-ray density, and the grain size increased. However, apparent density increased from 0.2 to 0.65 concentration of (Mg1/3Ta2/3)O2 and then decreased over 0.65 concentration of (Mg1/3Ta2/3)O2. The number and size of pores in grains also decreased from 0.2 to 0.65 concentration of (Mg1/3Ta2/3)O2 and then increased over 0.65 concentration of (Mg1/3Ta2/3)O2. It is expected that the relationship between structural characteristics and microwave dielectric characteristics have a good correlation.

Original languageEnglish
Pages (from-to)243-246
Number of pages4
JournalMaterials Chemistry and Physics
Volume79
Issue number2-3
DOIs
Publication statusPublished - 2003 Apr 10
Externally publishedYes

Keywords

  • (1-x)(AlTa)O-x(MgTa )O
  • Cell parameters
  • Grain size
  • Tetragonal structure
  • X-ray density

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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