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Dielectric properties of nanocomposites: opal matrix – titanate of Li-Zn and Bi

Keywords:

M.I. Samoylovich – Dr. Sc. (Phys.-Math.), Professor, Head of Department, Central Research Technological Institute «Technomash» (Moscow). E-mail: samoylovich@cnititm.ru A.F. Belyanin – Dr. Sc. (Eng.), Professor, Head of Laboratory, Central Research Technological Institute «Technomash» (Moscow). E-mail: belyanin@cnititm.ru A.S. Bagdasarian – Dr. Sc. (Eng.), Professor, Main Research Scientist, Kotel\'nikov IRE of RAS (Moscow) V. Bovtun – Dr. Sc. (Phys.-Math.), Leading Research Scientist, Institute of Physics ASCR (Praha) S.A. Bagdasarian – Ph. D. (Eng.), General Director JSC «Scientific Engineering Center «Technological Developments of Telecommunication and Radio Frequency Identification» (Moscow)


The conditions for the formation of nanocomposites based on the basis of lattice packings SiO2 nanospheres (opal matrices) with included crystallites of titanate of lithium-zinc and bismuth (Li2ZnTi3O8 and Bi2Ti2O7) in interspherical nanospacing are considered. Obtained nanocomposites volume> 2 cm3 in filling 30–40% of interspherical nanospacing Li2ZnTi3O8 and Bi2Ti2O7 crystallites size of ~50–81 and 28–30 nm, respectively. For the formation of nanocomposites used samples opal matrices with dimensions of single-domain regions >0,1 mm3, diameter SiO2 nanospheres was ~260 nm. The composition and structure of the nanocomposites studied X ray diffraction and Raman spectroscopy. Results of measuring of the frequency dependences of real and imaginary components of the permittivity and microwave conductivity (ranging 10-2–1012 Hz) obtained nanostructures are viewed. Dielectric characteristics have been studied using microwave and terahertz techniques.
References:

 

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May 29, 2020

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