-
V V Efimov,
E A Efimova,
K Iakoubovskii, S Khasanov,
D I Kochubey,
V V Kriventsov,
A Kuzmin,
B N Mavrin,
M Sakharov,
V Sikolenko,
A N Shmakov,
S I Tiutiunnikov
[show abstract]
[hide abstract]
ABSTRACT: EXAFS, X-ray diffraction and Raman studies of (Pb 1-x La x)(Zr 0.65 Ti 0.35)O3 (x=0.04 and 0.09) ceramics irradiated by high-current pulsed electron beam Abstract 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 (Pb 1-x La x)(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.
Journal of Physics and Chemistry of Solids 01/2006; 67:2007-2012. · 1.63 Impact Factor
-
V V Efimov,
E A Efimova,
K Iakoubovskii,
D V Karpinskii, S Khasanov,
D I Kochubey,
V V Kriventsov,
A Kuzmin,
A P Sazonov,
V Sikolenko,
M Sakharov,
A N Shmakov,
S I Tiutiunnikov
[show abstract]
[hide abstract]
ABSTRACT: The effect of pulsed electron irradiation on the long-and short-range order in the La0.7Sr0.3CoO3 ceramics is reported. Neutron and X-ray powder diffraction reveal that the unit cell symmetry and single-phase state of single and multiple irradiated La0.7Sr0.3CoO3 are preserved, while the oxygen atoms coordination changes towards the La0.5Sr0.5CoO3 structure. X-ray absorption data confirm this observation and further reveal the details of the shift and splitting of the Co3+ t2g and eg atomic orbitals. Possible mechanisms of pulsed electron irradiation effect in La0.7Sr0.3CoO3 are discussed.
Journal of Physics and Chemistry of Solids 01/2006; 67:2001-2006. · 1.63 Impact Factor
-
V.V. Efimov,
E.A. Efimova,
K. Iakoubovskii,
D.V. Karpinskii, S. Khasanov,
D.I. Kochubey,
V.V. Kriventsov,
A. Kuzmin,
A.P. Sazonov,
V. Sikolenko,
M. Sakharov,
A.N. Shmakov,
S.I. Tiutiunnikov
[show abstract]
[hide abstract]
ABSTRACT: The effect of pulsed electron irradiation on the long- and short-range order in the La0.7Sr0.3CoO3 ceramics is reported. Neutron and X-ray powder diffraction reveal that the unit cell symmetry and single-phase state of single and multiple irradiated La0.7Sr0.3CoO3 are preserved, while the oxygen atoms coordination changes towards the La0.5Sr0.5CoO3 structure. X-ray absorption data confirm this observation and further reveal the details of the shift and splitting of the Co3+ t2g and eg atomic orbitals. Possible mechanisms of pulsed electron irradiation effect in La0.7Sr0.3CoO3 are discussed.
Journal of Physics and Chemistry of Solids.
-
V.V. Efimov,
E.A. Efimova,
K. Iakubovskii, S. Khasanov,
D.I. Kochubey,
V.V. Kriventsov,
A. Kuzmin,
B.N. Mavrin,
M. Sakharov,
V. Sikolenko,
A.N. Shmakov,
S.I Tiutiunnikov
