Structure, Optical and Electric Properties of Opal-Bismuth Silicate Nanocomposites
M. Derhachova, V. Moiseienko a, N. Kutseva a, B. Abu Sal b, R. Holze c, S. Pliaka a and A. Yevchyk a
aOles Honchar Dnipro National University, Gagarina 72, 49010 Dnipro, Ukraine
bApplied Physics Department, Tafila Technical University, P.O. Box 40, Al-Eis 66141, Tafila, Jordan
cTechnische Universit├Ąt Chemnitz, Institute of Chemistry, Str. der Nationen 62, D-09111 Chemnitz, Germany
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Synthetic opals composed of 300 nm silica spheres are impregnated with a Bi12SiO20 melt at 1190 K. Structure and properties of the as-prepared samples are studied by employing the scanning electron microscopy, X-ray diffraction, and optical spectroscopy and direct current conductivity techniques. The nanocomposites are found to be multi-phase systems composed of Bi12SiO20, Bi4Si3O12 and SiO2 crystallites with an average linear size not less than 20 nm. Formation of Bi4Si3O12 crystallites becomes possible as a result of changing in the Bi2O3-SiO2 molar ratio due to the melting of silica spheres. The Raman intensity redistribution observed by surface scanning may be caused by both composition inhomogeneity and concentration of the exciting radiation field at composite defects. The "red" shift of photoluminescence band is observed. Activation energy of direct current conductivity is estimated as 1.1 eV.

DOI: 10.12693/APhysPolA.133.806
PACS numbers: 81.07.Bc, 81.40.Tv, 81.70.Fy, 78.67.Bf