EXAFS, X-ray diffraction and Raman studies of (Pb1−xLax)(Zr0.65Ti0.35)O3 ( and 0.09) ceramics irradiated by high-current pulsed electron beam

Autor: D.I. Kochubey, E. A. Efimova, A.N. Shmakov, K. Iakoubovskii, V. V. Sikolenko, B. N. Mavrin, S. S. Khasanov, V. V. Efimov, M. Sakharov, Alexei Kuzmin, S. I. Tiutiunnikov, Vladimir V. Kriventsov
Rok vydání: 2006
Předmět:
Zdroj: Journal of Physics and Chemistry of Solids. 67:2007-2012
ISSN: 0022-3697
Popis: We report the effect of pulsed electron beam irradiation on the long-range and short-range atomic structure, as well as on the Raman phonon modes, of perovskite (Pb1−xLax)(Zr0.65Ti0.35)O3, x = 0.04 and 0.09 (PLZT 4/65/35 and 9/65/35) ferroelectric ceramics. X-ray powder diffraction (XRD) spectra from the single-pulse-irradiated PLZT 9/65/35 samples reveal transformation of the cubic Pm3m ( Z = 1 ) into the orthorhombic Pmmm ( Z = 1 ) structure. This symmetry change is however not observed for 10-pulse irradiation performed under the same conditions: here only an increase in the coherent scattering regions, lattice volume, and the Zr–O distance distribution is observed, as revealed by XRD and X-ray absorption spectroscopy at Zr K-edge. Raman scattering from PLZT 9/65/35 ceramics is in agreement with the symmetry reduction after single-pulse irradiation and reveals significant Raman signal intensity decrease after multiple-pulse irradiation. On the contrary, no significant structural changes could be detected in PLZT 4/65/35 ceramics after single- or multiple-pulse irradiation. Possible mechanisms of pulsed electron irradiation effects in PLZT 4/65/35 and 9/65/35 ceramics are discussed.
Databáze: OpenAIRE
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