Fabrication of BaTi2O5 glass-ceramics with unusual dielectric properties during crystallization

Jianding Yu, Yasutomo Arai, Tadahiko Masaki, Takehiko Ishikawa, Shinichi Yoda, Shinji Kohara, Hiroshi Taniguchi, Mitsuru Itoh, Yoshihiro Kuroiwa

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88 Citations (Scopus)

Abstract

A 2-mm-diameter glass sphere of ferroelectric BaTi2O5 was fabricated from melt using containerless processing. The glass structure was analyzed by high-energy X-ray diffraction using an incident photon energy of 113.5 keV, indicating that distorted Ti-O polyhedra, with average coordination number (NTi-o) of approximately 5, presented in the glass. Above the glass transition temperature (972 K), three successive phase transitions, from glass to a metastable a phase at 972 K, then to a metastable β phase at 1038 K, and finally to a stable monoclinic γ phase above 1100 K, were observed. At the crystallization temperature of the a phase, the permittivity jumped instantaneously by more than 1 order of magnitude, reaching a peak of 1.4 × 107. This interesting phenomenon, occurring near the crystallization temperature, has important technical implications for obtaining an excellent dielectric glass-ceramic through controlled crystallization of BaTi 2O5 glass.

Original languageEnglish
Pages (from-to)2169-2173
Number of pages5
JournalChemistry of Materials
Volume18
Issue number8
DOIs
Publication statusPublished - 2006 Apr 18
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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    Yu, J., Arai, Y., Masaki, T., Ishikawa, T., Yoda, S., Kohara, S., Taniguchi, H., Itoh, M., & Kuroiwa, Y. (2006). Fabrication of BaTi2O5 glass-ceramics with unusual dielectric properties during crystallization. Chemistry of Materials, 18(8), 2169-2173. https://doi.org/10.1021/cm0525555