S. V. Myakina, V. G. Korsakova, T. I. Panovab, E. A. Sosnova, Yu. C. Fomchenkovaa,
M. M. Sychova, and O. A. Shilovab,*
aSt. Petersburg State Institute of Technology (Technical University),
Moskovskii pr. 26, St. Petersburg, 190013 Russia
bGrebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences,
nab. Admirala Makarova 2, St. Petersburg, 199034 Russia
*e-mail: olgashilova@bk.ru
Received December 27, 2010
Abstract—The effect of chemical modification of submicron barium titanate particles by the deposition of
MxOy (x = Ti ,Co, Ni) oxide layers from aqueous solutions of the corresponding precursors is studied upon the
surface properties of modified BaTiO3 particles and dielectric permittivity of organo-inorganic composites
obtained by their dispersion in the matrix of cyanoethyl ester of polyvinyl alcohol and useful in electrolumines-
cent light sources. It is shown that a significant increase (by about 25%) of the dielectric permittivity is observed
only when adding Nb2O5, in comparison with a similar composite which contains unmodified BaTiO3. A cor-
relation is found between the dielectric permittivity of the organo-inorganic composites and the presence of
Brensted neutral and basic centers with pKa = 6–13, localized on the surface of a filler, being capable of inter-
acting with the polymer matrix. It is shown that an increase of the dielectric permittivity upon deposition of
niobium oxide on the surface of BaTiO3 is caused by formation of such centers and modification of the surface
layer structure of BaTiO3 particles, with transformation of rutile-like Ti–O bonds to anatase-like ones.
Keywords: barium titanate, organo-inorganic composites, compatibility surface modification, chemical co-
deposition, high permittivity
DOI: 10.1134/S1087659611060125
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