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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Effect of Yttrium Doping in Barium Zirconium Titanate Ceramics: A Structural, Impedance, and Modulus Spectroscopy Study

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Author(s):
Badapanda, Tanmaya [1] ; Cavalcante, Laecio Santos [2] ; Da Luz, Jr., Geraldo Eduardo [2] ; Batista, Nouga Cardoso [2] ; Anwar, Shahid [3] ; Longo, Elson [4]
Total Authors: 6
Affiliation:
[1] CV Raman Coll Engn, Dept Phys, Bhubaneswar 752054, Orissa - India
[2] Univ Estadual Piaui, CCN Quim, BR-64002150 Teresina, PI - Brazil
[3] Inst Minerals & Mat Technol, Bhubaneswar 751013, Orissa - India
[4] LIEC Univ Estadual Paulista, BR-14801907 Araraquara, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE; v. 44A, n. 9, p. 4296-4309, SEP 2013.
Web of Science Citations: 10
Abstract

In the current article, we studied the effect of yttrium {[}Y3+] ions' substitution on the structure and electric behavior of barium zirconate titanate (BZT) ceramics with a general formula {[}Ba1-x Y-2x/3](Zr0.25Ti0.75)O-3 (BYZT) with {[}x = 0, 0.025, and 0.05] which were prepared by the solid-state reaction method. X-ray diffraction patterns indicate that these ceramics have a single phase with a perovskite-type cubic structure. Rietveld refinement data confirmed {[}BaO12], {[}ZrO6], {[}TiO6], and {[}YO6] clusters in the cubic lattice. The Y3+ ions' effects on the electric conductivity behavior of BZT ceramics as a function of temperature and frequency are described, which are based on impedance spectroscopy analyses. The complex impedance plots display a double semicircle which highlights the influences of grain and grain boundary on the ceramics. Impedance analyses showed that the resistance decreased with the increasing temperature and resulted in a negative temperature coefficient of the resistance property in all compositions. Modulus plots represent a non-Debye-type dielectric relaxation which is related to the grain and grain boundary as well as temperature-dependent electric relaxation phenomenon and an enhancement in the mobility barrier by Y3+ ions. Moreover, the electric conductivity increases with the replacement of Ba2+ by Y3+ ions may be due to the rise in oxygen vacancies. (AU)

FAPESP's process: 09/50303-4 - Optical and photocatalytic properties of ZnMoO4 and ZnWO4
Grantee:Laécio Santos Cavalcante
Support Opportunities: Scholarships in Brazil - Post-Doctoral