Results 221 to 230 of about 6,161 (262)

Raman spectroscopy of CaTiO3-based perovskite solid solutions

Journal of Materials Research, 2004
Perovskite-structured solid solutions intended for use as microwave dielectric resonators were studied by Raman spectroscopy. Two distinct categories were investigated: (i) simple perovskite–simple perovskite solid solutions, that is, CaTiO3–SrTiO3 (CTST), CaTiO3–CaZrO3 (CTCZ), CaTiO3–NdAlO3 (CTNA), and CaTiO3–LaGaO3 (CTLG); and (ii) simple perovskite ...
H. Zheng, I.M. Reaney, G.D.C. Csete de Györgyfalva, R. Ubic, J. Yarwood, M.P. Seabra, V.M. Ferreira   +6 more
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CO oxidation and methane combustion on LaAl1−xFexO3 perovskite solid solutions

Applied Catalysis B: Environmental, 2002
Catalytic CO oxidation and CH4 combustion were studied over LaAl1-xFexO3 (with x between 0 and 1) perovskites prepared by citrate method and calcined at 1073 K. The catalysts were characterised by X-ray diffraction (XRD), diffuse reflectance spectroscopy (DRS), and magnetic susceptibility.
P Ciambelli, S Cimino, G Lasorella, L Lisi, S De Rossi, M Faticanti, G Minelli, P Porta   +7 more
openaire   +4 more sources

Electrical transport in the perovskite solid solution LaNi1−xCoxO3

Physica C: Superconductivity, 1988
Abstract We have studied the resistivity and thermopower of the solid solution LaNi 1−x Co x O 3 in the temperature range 1.4K–300K.
Rajeev, KP, Vasanthacharya, NY, Raychauduri, AK, Ganguly, P, Rao, CNR   +4 more
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Quantum chemical modelling of polarons and perovskite solid solutions

Computational Materials Science, 2001
Abstract Following our previous study [J. Phys.: Condens. Matter 10 (1998) 6271] of a single Nb impurity and Nb clusters in KTaO 3 , we present results of the calculations for a series of perovskite KNb x Ta 1− x O 3 (KTN) solid solutions ( x =0, 0.125, 0.25, 0.75, 1).
R.I. Eglitis, E.A. Kotomin, G. Borstel
openaire   +1 more source

Homogenization mechanism of perovskite solid solutions

Ferroelectrics, 1999
Abstract Mechanism of homogenization of perovskite solid solutions was studied. Compositional inhomogeneity (compositional fluctuation) of lead titanate zirconate (PZT) was found by a measurement of X-ray diffraction peaks. The compositional fluctuation was considered to be caused from a gap where neither mechanical mixing of raw materials nor ...
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Perovskite-like Solid Solutions in the System LiTaO3-CaZrO3

Journal of Solid State Chemistry, 1994
Abstract An investigation of the LiTaO 3 -CaZrO 3 phase diagram has been carried out and the solid solution limits redetermined. LiTaO 3 solid solutions extend from 0 to 20 mole% CaZrO 3 . CaZrO 3 solid solutions cover the range 27 to 100 mole% CaZrO 3 , but are incomplete since a two-phase region or immiscibility gap occurs over the range ∼ 88 to
R.I. Smith, A.R. West
openaire   +1 more source

Atomic-level simulation of ferroelectricity in perovskite solid solutions

Applied Physics Letters, 2000
Building on the insights gained from electronic-structure calculations and from experience obtained with an earlier atomic-level method, we developed an atomic-level simulation approach based on the traditional Buckingham potential with shell model which correctly reproduces the ferroelectric phase behavior and dielectric and piezoelectric properties ...
M. Sepliarsky, S. R. Phillpot, D. Wolf, M. G. Stachiotti, R. L. Migoni   +4 more
openaire   +1 more source

Band-gap nonlinearity in perovskite structured solid solutions

Journal of Applied Physics, 2010
Compositional effects on optical band-gap energy using end members of ABO3 perovskites have been investigated through an optical absorption with a UV-spectroscopy. Three examples are selected, namely, BaTiO3–CaTiO3, BaTiO3–BaZrO3, and SrTiO3–BaZrO3 solid solutions.
Soonil Lee, Roni D. Levi, Weiguo Qu, Sung Chan Lee, Clive A. Randall   +4 more
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Probabilistic models of a local structure of perovskite solid solutions

Bulletin of the Russian Academy of Sciences: Physics, 2007
The magnitudes of the structure amplitudes (|F(h, k, l)|) of the X-ray diffraction reflections measured for a PbIn1/2Nb1/2O3 single crystal are compared with those calculated with the use of a sequence of probability-theoretical models constructed for the structure of the PbIn1/2Nb1/2O3 compound.
K. Yu. Gufan, R. V. Kolesova, V. V. Rumyantseva   +2 more
openaire   +1 more source

Raman and x-ray study of perovskite solid solutions

Journal of Physics: Condensed Matter, 1998
La and Nd gallates are currently being used as substrate materials for high temperature superconductor thin film deposition. In this work we have synthesized and characterized by means of XRD and Raman spectroscopy solid solutions of the type . Polarized Raman study of and single crystals is also performed.
M L Sanjuán, V M Orera, R I Merino, J Blasco   +3 more
openaire   +1 more source