Relationship between ferroelectric properties and local structure of Pb1−xBaxZr0.40Ti0.60O3 ceramic materials studied by X-ray absorption and Raman spectroscopies

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Writers: Alexandre Mesquita, Alain Michalowicz, Jacques Moscovici, Paulo Sergio Pizani, Valmor Roberto Mastelaro

Keywords: Ferroelectrics; Relaxor, PBZT; PZT, EXAFS; Raman

Abstract: This paper reports on the structural characterization of Pb_1−xBa_xZr_0.40Ti_0.60O₃ (PBZT) ferroelectric ceramic compositions prepared by the conventional solid state reaction method. X-ray absorption spectroscopy (XAS) and Raman spectroscopy were used in the probing of the local structure of PBZT samples that exhibit a normal or relaxor ferroelectric behavior. They showed a considerable local disorder around Zr and Pb atoms in the samples of tetragonal or cubic long-range order symmetry. The intensity of the E(TO₃) mode in the Raman spectra of PBZT relaxor samples remains constant at temperatures lower than T_m, which has proven the stabilization of the correlation process between nanodomains.