Crystal structure and microwave dielectric properties of (1 - X)ZnTa 2O 6-xTiO 2 ceramics

Jeong Hyun Park, Sahn Nahm, Jae Gwan Park

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

The crystal structural variations of (1 - x)ZnTa 2O 6-xTiO 2 ceramics sintered at 1250 °C for 2 h were investigated, and the relationship of these variations with the microwave dielectric properties were studied. Four types of crystal structures were identified with increasing x: tri-α-PbO 2, α-PbO 2, trirutile, and rutile. For x ≤ 0.2, single-phase solid solutions of the tri-α-PbO 2 structure were formed, whereas for x = 0.4, a mixture of two solid solution phases based on the α-PbO 2 and trirutile structures was obtained. For x = 0.5, a single phase of ZnTiTa 2O 8 with the trirutile structure was obtained, and for x ≥ 0.6, the ceramics formed single-phase solid solutions of the rutile structure. The microwave dielectric properties of the ceramics were changed by the crystal structural transitions: for x < 0.4, the phases of the tri-α-PbO 2 or α-PbO 2 structures exhibited ZnTa 2O 6-like dielectric behavior, while for x ≥ 0.4, the phases of the trirutile or rutile structure exhibited more TiO 2(rutile)-like behaviors as x increased. The ZnTiTa 2O 8 (x = 0.5) ceramics had a dielectric constant (k) of 46.2, a quality factor (Q × f) of 36,700 GHz, and a temperature coefficient of the resonant frequency (τ f) of +74 ppm/°C.

Original languageEnglish
Pages (from-to)221-226
Number of pages6
JournalJournal of Alloys and Compounds
Volume537
DOIs
Publication statusPublished - 2012 Oct 5

Keywords

  • Crystal structure
  • Dielectric response
  • Sintering
  • TEM
  • X-ray diffraction

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Chemistry
  • Metals and Alloys

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