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

研究成果: Article査読

94 被引用数 (Scopus)


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.

ジャーナルChemistry of Materials
出版ステータスPublished - 2006 4月 18

ASJC Scopus subject areas

  • 化学 (全般)
  • 化学工学(全般)
  • 材料化学


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