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Relaxor properties of Ba(Zr,Ti)O3 ceramics (Articolo in rivista)

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C. E. Ciomaga; R. Calderone; M. T. Buscaglia; M. Viviani; V. Buscaglia; L. Mitoseriu; A. Stancu; P. Nanni (2006)
Relaxor properties of Ba(Zr,Ti)O3 ceramics
in Journal of Optoelectronics and Advanced Materials (Online); National Institute for Optoelectronics, Bucharest-Magurele (Romania)
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C. E. Ciomaga; R. Calderone; M. T. Buscaglia; M. Viviani; V. Buscaglia; L. Mitoseriu; A. Stancu; P. Nanni (literal)

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In: Journal of Optoelectronics and Advanced Materials, vol. 8 (3) pp. 944-948. National Institute of Optoelectronics, Bucharest, Romania, 2006. (literal)

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Dept. of Solid State and Theoretical Physics, Al. I. Cuza University, Blvd. Carol I, 11, Iasi 700506, Romania; Dept. of Chemical Processes, University of Genoa, P.le Kennedy 1, I-16129 Genoa, Italy; Institute of Energetics and Interphases - CNR, Via De Marini 6, I-16149 Genoa, Italy (literal)

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BaZrxTi1-xO3 is a possible candidate as environmental friendly electroceramic material (Pb-free ferroelectric) due to its high dielectric and piezoelectric constants and ferroelectric properties in a temperature range which can be tuned by the composition. Its properties change from full ferroelectric behavior (x=0; BaTiO3) with a sharp ferro-para phase transition to the full relaxor state (for 0.10<=x<=0.35), when the structure is pseudo-cubic and the transition has a strong diffuse character and a frequency-relaxation in the kHz range. In the present work, the cross-over composition BaZr0.1Ti0.9O3 was investigated. The ceramics have been prepared via solid state reaction; optimum parameters for calcination and sintering in order to obtain pure perovskite phase and a good densification have been found. The temperature dependence of the dielectric constant shows a diffuse phase transition with a small shift of the temperature corresponding to the maximum permittivity of (1-2) °C in the frequency range of 1 Hz÷1 MHz. The losses are smaller than 30% for temperatures below 130 °C, with a slight increasing at low frequency and high temperatures. The real part of the permittivity follows the Curie-Weiss law with frequency-dependent constants. The dielectric spectroscopy data show at least two relaxation processes: a thermally-activated one characteristic to low-frequency range f<100 Hz and a temperature-independent one at f>=100 Hz. (literal)

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