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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

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

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Autor(es):
Badapanda, Tanmaya [1] ; Cavalcante, Laecio Santos [2] ; Da Luz, Jr., Geraldo Eduardo [2] ; Batista, Nouga Cardoso [2] ; Anwar, Shahid [3] ; Longo, Elson [4]
Número total de Autores: 6
Afiliação do(s) autor(es):
[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
Número total de Afiliações: 4
Tipo de documento: Artigo Científico
Fonte: METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE; v. 44A, n. 9, p. 4296-4309, SEP 2013.
Citações Web of Science: 10
Resumo

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)

Processo FAPESP: 09/50303-4 - Propriedades ópticas e fotocatalíticas do ZnMoO4 e ZnWO4
Beneficiário:Laécio Santos Cavalcante
Linha de fomento: Bolsas no Brasil - Pós-Doutorado