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

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]

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

• 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
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado