Preparation and structural stability of ordered nanocomposites: opal matrix - lead titanates

8th International Scientific Conference "Issues of Physics and Technology in Science, Industry and Medicine"

物理学;工业技术;医药卫生

Samoylovich, M.I.^1,4 ; Mkrtchyan, A.R.^2,3 ; Belyanin, A.F.^1,4 ; Bagdasaryan, S.A.^4 ; Kiziridi, A.A.^3

Central Research Technological Institute Technomash, Moscow, Russia^1

Institute of Applied Problems of Physics, NAS, Yerevan, Armenia^2

National Research Tomsk Polytechnic University, Tomsk, Russia^3

Joint Stock Company, Sci. Eng. Center Technological Developments of Telecommunication and Radio Frequency Identification, Moscow, Russia^4

关键词: Lattice packings;    Local phase transition;    Opal matrix;    Single domains;    Space Groups;    Structural stabilities;    Synthesized materials;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/135/1/012038/pdf
DOI  :  10.1088/1757-899X/135/1/012038

来源: IOP

【 摘 要 】

The conditions for the formation of nanocomposites based on the basis of lattice packings of SiO2nanospheres (opal matrices) with included crystallites of lead titanates (PbTiO3and PbTi3O7) in interspherical nanospacing are considered. For the formation of nanocomposites are used sample opal matrices with dimensions of single-domain regions ≥0,1 mm.3The diameter of SiO2nanospheres was ∼260 nm. Obtained nanocomposites volume >2 cm3in filling >20% of interspherical nanospacing PbTiO3, PbTi3O7crystallites were size of 16-36 nm. Using X-ray diffraction and Raman spectroscopy are studied composition and structural stability when heated nanocomposites to 550°C, which allowed the identification of a local phase transition with change of the space group. The dependence of the composition of synthesized materials on the conditions of their preparation is submitted.