Formation mechanism of ferroelastic Ba2TiGe2O8 and second order optical non-linearity in transparent crystallized glasses

Y. Takahashi, Y. Benino, T. Fujiwara, T. Komatsu

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45 Citations (Scopus)


The formation mechanism of ferroelastic Ba2TiGe2O8 crystals in 30BaO·15TiO2·55GeO2 glass and second order optical non-linearity of transparent crystallized glasses have been examined. It has been confirmed that the BaTiGe3O9 crystalline phase is initially precipitated and acts as a nucleation site for the formation of the Ba2TiGe2O8 crystalline phase. Transparent surface crystallized glasses consisting of grain-oriented Ba2TiGe2O8 crystals have been successfully fabricated by means of heat-treatments (690-750 °C, 3 h) for the first time, and second harmonic (SH) generation has been clearly observed, demonstrating that Ba2TiGe2O8 is a non-linear optical crystalline phase. The SH intensity of transparent crystallized glasses (bulk state) with crystalline layers of ∼10 μm thickness is comparable to that of Z-cut α-quartz single crystal with a thickness of 0.6 mm. The SH intensity of Ba2TiGe2O8 crystals (powdered state) prepared through solid-state reaction is about 130 times as large as that of pulverized α-quartz.

Original languageEnglish
Pages (from-to)320-330
Number of pages11
JournalJournal of Non-Crystalline Solids
Issue number2-3
Publication statusPublished - Feb 2003
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry


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