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 (N
Ti
-
O)
of approximately 5, presented in the glass. Above the glass transition temperature (972 K), three successive
phase transitions, from glass to a metastable α 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 α 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 BaTi2O5 glass.
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