Compositional dependence of microwave dielectric properties in (1 - x)(Na1/2Nd1/2)TiO3-xNd(Mg1/2Ti1 /2)O3 ceramics

Jae Beom Kim, Ki Hyun Yoon, Yong Soo Cho

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The compositional dependence of microwave dielectric properties has been investigated in the (1 - x)(Na1/2Nd1/2)TiO3-xNd(Mg1/2Ti1 /2)O3 (NNT-NMT) system. The addition of NMT results in significant improvement in the quality factor and the temperature coefficient of frequency, but gradually decreases the dielectric constant from ∼100 for pure NNT to ∼25 for pure NMT. The single perovskite phase is observed with various {hkl} superlattice reflections over the entire compositional range. The increasing tendency of peak splitting with increasing x at some perovskite reflections strongly suggests that the crystal structure of the system changes to lower symmetry structures. This is confirmed using infrared reflectivity spectra. The superlattice reflections related to structural deviation become more predominant as the composition reaches pure NMT. Particularly, {111} superlattice reflections are believed to be associated with the 1:1 cation ordering and responsible for the observed abrupt increase in quality factor at x > 0.7.

Original languageEnglish
Pages (from-to)1159-1161
Number of pages3
JournalJournal of the American Ceramic Society
Volume86
Issue number7
DOIs
Publication statusPublished - 2003 Jan 1

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Dielectric properties
Microwaves
Perovskite
Crystal symmetry
Cations
Permittivity
Crystal structure
Positive ions
Infrared radiation
Chemical analysis
Temperature
perovskite

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

Cite this

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title = "Compositional dependence of microwave dielectric properties in (1 - x)(Na1/2Nd1/2)TiO3-xNd(Mg1/2Ti1 /2)O3 ceramics",
abstract = "The compositional dependence of microwave dielectric properties has been investigated in the (1 - x)(Na1/2Nd1/2)TiO3-xNd(Mg1/2Ti1 /2)O3 (NNT-NMT) system. The addition of NMT results in significant improvement in the quality factor and the temperature coefficient of frequency, but gradually decreases the dielectric constant from ∼100 for pure NNT to ∼25 for pure NMT. The single perovskite phase is observed with various {hkl} superlattice reflections over the entire compositional range. The increasing tendency of peak splitting with increasing x at some perovskite reflections strongly suggests that the crystal structure of the system changes to lower symmetry structures. This is confirmed using infrared reflectivity spectra. The superlattice reflections related to structural deviation become more predominant as the composition reaches pure NMT. Particularly, {111} superlattice reflections are believed to be associated with the 1:1 cation ordering and responsible for the observed abrupt increase in quality factor at x > 0.7.",
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Compositional dependence of microwave dielectric properties in (1 - x)(Na1/2Nd1/2)TiO3-xNd(Mg1/2Ti1 /2)O3 ceramics. / Kim, Jae Beom; Yoon, Ki Hyun; Cho, Yong Soo.

In: Journal of the American Ceramic Society, Vol. 86, No. 7, 01.01.2003, p. 1159-1161.

Research output: Contribution to journalArticle

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N2 - The compositional dependence of microwave dielectric properties has been investigated in the (1 - x)(Na1/2Nd1/2)TiO3-xNd(Mg1/2Ti1 /2)O3 (NNT-NMT) system. The addition of NMT results in significant improvement in the quality factor and the temperature coefficient of frequency, but gradually decreases the dielectric constant from ∼100 for pure NNT to ∼25 for pure NMT. The single perovskite phase is observed with various {hkl} superlattice reflections over the entire compositional range. The increasing tendency of peak splitting with increasing x at some perovskite reflections strongly suggests that the crystal structure of the system changes to lower symmetry structures. This is confirmed using infrared reflectivity spectra. The superlattice reflections related to structural deviation become more predominant as the composition reaches pure NMT. Particularly, {111} superlattice reflections are believed to be associated with the 1:1 cation ordering and responsible for the observed abrupt increase in quality factor at x > 0.7.

AB - The compositional dependence of microwave dielectric properties has been investigated in the (1 - x)(Na1/2Nd1/2)TiO3-xNd(Mg1/2Ti1 /2)O3 (NNT-NMT) system. The addition of NMT results in significant improvement in the quality factor and the temperature coefficient of frequency, but gradually decreases the dielectric constant from ∼100 for pure NNT to ∼25 for pure NMT. The single perovskite phase is observed with various {hkl} superlattice reflections over the entire compositional range. The increasing tendency of peak splitting with increasing x at some perovskite reflections strongly suggests that the crystal structure of the system changes to lower symmetry structures. This is confirmed using infrared reflectivity spectra. The superlattice reflections related to structural deviation become more predominant as the composition reaches pure NMT. Particularly, {111} superlattice reflections are believed to be associated with the 1:1 cation ordering and responsible for the observed abrupt increase in quality factor at x > 0.7.

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