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

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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
Publication statusPublished - 2002 Mar 1

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Dielectric properties
dielectric properties
Crystal structure
Microwaves
ceramics
microwaves
crystal structure
Natural frequencies
Permittivity
Chemical analysis
Temperature
resonant frequencies
permittivity
coefficients
temperature

Keywords

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

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

Cite this

Kim, M. H., Woo, C. S., Nahm, S., Choi, C. H., Lee, H. J., & Park, H. M. (2002). Crystal structure and microwave dielectric properties of (1 - x)NdAlO3-xCaTiO3 ceramics. Materials Research Bulletin, 37(3), 605-615.

Crystal structure and microwave dielectric properties of (1 - x)NdAlO3-xCaTiO3 ceramics. / Kim, Min Han; Woo, Chang Soo; Nahm, Sahn; Choi, Chang Hack; Lee, Hwack Joo; Park, Hyun Min.

In: Materials Research Bulletin, Vol. 37, No. 3, 01.03.2002, p. 605-615.

Research output: Contribution to journalArticle

Kim, MH, Woo, CS, Nahm, S, Choi, CH, Lee, HJ & Park, HM 2002, 'Crystal structure and microwave dielectric properties of (1 - x)NdAlO3-xCaTiO3 ceramics', Materials Research Bulletin, vol. 37, no. 3, pp. 605-615.
Kim, Min Han ; Woo, Chang Soo ; Nahm, Sahn ; Choi, Chang Hack ; Lee, Hwack Joo ; Park, Hyun Min. / Crystal structure and microwave dielectric properties of (1 - x)NdAlO3-xCaTiO3 ceramics. In: Materials Research Bulletin. 2002 ; Vol. 37, No. 3. pp. 605-615.
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