Crystal structure and microwave dielectric properties of (1 - x)NdAlO3-xCaTiO3 ceramics

Min Han Kim, Chang Soo Woo, Sahn Nahm, Chang Hack Choi, Hwack Joo Lee, Hyun Min Park

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Crystal structure and microwave dielectric properties of (1-x)NdAlO3-xCaTiO3 ceramics have been investigated. Crystal structure of the specimens changed with the composition. Rhombohedral structure was found for the specimens with x ≤ 0.1. When 0.3 ≤ x ≤ 0.7, the specimens had the tetragonal structure and it changed to the orthorhombic structure as x exceeded 0.7. Two types of the second phases were observed in (1-x)NdAlO3-xCaTiO3 ceramics. For the specimens with x ≤ 0.5, Nd4Al2O9 phase was observed and Al-rich phase was found in the specimens with x ≥ 0.7. The dielectric constant (εr) and the temperature coefficient of the resonant frequency (τf) increased with the increase of x. The Q × f value of the specimen increased with x and exhibited the maximum value when x = 0.5. The microwave dielectric properties of Q × f = 45,000 GHz, εr = 45 and τf = -1.5 ppm/°C were obtained for 0.3NdAlO3-0.7CaTiO3 ceramics.

Original languageEnglish
Pages (from-to)605-615
Number of pages11
JournalMaterials Research Bulletin
Volume37
Issue number3
DOIs
Publication statusPublished - 2002 Mar 1

Keywords

  • A. Ceramics
  • A. Electronic materials
  • C. X-ray diffraction
  • D. Dielectric properties

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Crystal structure and microwave dielectric properties of (1 - x)NdAlO<sub>3</sub>-xCaTiO<sub>3</sub> ceramics'. Together they form a unique fingerprint.

  • Cite this