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

Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science Volume: 44A Issue: 9 Pages: 4296-4309 Published: 2013

Schematic representation of crystalline [Ba1xY2x/3](Zr0.25Ti0.75)O3 supercells (19292) with [(a) x = 0, and (b) 0.025 or 0.05], illustrating the [TiO6], [ZrO6], [YO6], and [BaO12] clusters.

Writers: Tanmaya Badapanda, Laécio Santos Cavalcante, Geraldo Eduardo da Luz Jr, Nouga Cardoso Batista, Shahid Anwar, Elson Longo

Keywords: Ceramics; Spectroscopy; Study

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−xY2x/3](Zr0.25Ti0.75)O3 (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.

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

DOI: 10.1007/s11661-013-1770-3

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