Investigations of BaxSr1−xTiO3 ceramics and powders prepared by direct current arc discharge technique

BaxSr1−xTiO3 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 BaxSr1−xTiO3 ceramics was found to occur at x ≈ 0.75. XRD investigat...

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Bibliographic Details
Published in:Applied physics letters 2014-09, Vol.105 (9)
Main Authors: Li, Shuangbin, Yao, Ying, Yuzyuk, Yu. I., Jia, Yongzhong, Wang, Xiaohan, Xie, Shaolei, Jing, Yan
Format: Article
Language:English
Subjects:
Applied physics
Barium titanates
Ceramic powders
Ceramics
Direct current
Discharge
Electric arcs
Ferroelectric materials
Ferroelectricity
Hexagonal phase
Phase transitions
Plasma
Raman spectra
Raman spectroscopy
Solid solutions
Spectrum analysis
X ray spectra
X-ray diffraction
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Summary:BaxSr1−xTiO3 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 BaxSr1−xTiO3 ceramics was found to occur at x ≈ 0.75. XRD investigation of as-grown BaTiO3 ceramics revealed co-existence of tetragonal and hexagonal modifications with a small amount of impurity phase BaTi4O9. No evidences of hexagonal phase were observed in Raman spectra of as-grown BaTiO3 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 BaTiO3 ceramics prepared by direct current arc discharge technique is proposed. Absence of the hexagonal phase in any BaxSr1−xTiO3 solid solution with x 
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4894456