Publication Date:
2014-09-03
Description:
Ba x Sr 1−x TiO 3 ceramics with x ranging from 0 to 1 were prepared by direct current arc discharge technique and studied by means of x-ray diffraction (XRD) and Raman spectroscopy. The cubic-tetragonal ferroelectric phase transition in Ba x Sr 1−x TiO 3 ceramics was found to occur at x ≈ 0.75. XRD investigation of as-grown BaTiO 3 ceramics revealed co-existence of tetragonal and hexagonal modifications with a small amount of impurity phase BaTi 4 O 9 . No evidences of hexagonal phase were observed in Raman spectra of as-grown BaTiO 3 ceramics, while Raman peaks related to hexagonal phase were clearly observed in the spectrum of fine-grain powders prepared from the same ceramics. A core-shell model for BaTiO 3 ceramics prepared by direct current arc discharge technique is proposed. Absence of the hexagonal phase in any Ba x Sr 1−x TiO 3 solid solution with x
Print ISSN:
0003-6951
Electronic ISSN:
1077-3118
Topics:
Physics
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