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Dielectric and Structural Characterization of Pb1–x A x Zr 0.40Ti0.60O3 (A = Sr, Ca) Ferroelectric Ceramics

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This paper reports the influence of Sr- and Ca-substitution on the structural and ferroelectric properties of Pb1–x Sr x Zr 0.40Ti0.60O3 (PSZT) and Pb1–x Ca x Zr 0.40Ti0.60O3 (PCZT) ceramic systems. The dielectric measurements show that these substitutions cause a diffuse behavior in the dielectric permittivity curves for all samples. According to the X-ray absorption near-edge structure (XANES) spectra collected at Ti K- and LIII -edge, when Pb was replaced by Sr or Ca, a decrease in the local distortion around Ti atoms in the TiO6 octahedron could be observed. The O K-edge XANES spectra also revealed that the hybridization between O 2p and Pb 6sp states decreased as the amount of Sr or Ca atoms increased. Based on these results, it was possible to ascertain that the ferroelectric behavior in PSZT and PCZT samples bears a close correlation to the hybridization weakening between O 2p and Pb 6sp states.
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Keywords: DIELECTRIC PERMITTIVITY; FERROELECTRICS; LEAD ZIRCONATE TITANATE; PCZT; PSZT; PZT; XANES

Document Type: Research Article

Publication date: September 1, 2013

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  • Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
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