Search academic texts

Information × Registration Number 0223U002702, 0122U001591 , R & D reports Title Physico-chemical processes of formation of light scattering in large-size Ti:S crystals for use in high-power laser systems popup.stage_title Head Nizhankovskyi Serhii V., Кандидат технічних наук Registration Date 02-03-2023 Organization Institute of Single Crystals of the National Academy of Sciences of Ukraine popup.description2  The physico-chemical processes and conditions for the formation of light-scattering molybdenum microinclusions in the process of growing large-sized (110 mm x 125 mm x 30 mm) Ti:S single crystals by the HDC method with gradient doping in a carbon-containing gas medium were studied. It was established that microinclusions are formed as a result of oxidation of the molybdenum crucible in the temperature range of 500-2150 oC by components of the technological environment, products of dissociation of the charge and melt, mass transfer of volatile molybdenum oxides (MoO, MoO2, MoO3) to the surface of the raw material or melt and their successive melting, decomposition or recovery CO, H2 and carbon to the metallic state with the formation of microparticles that fall into the melt and are transported to the crystal by convective flows. In order to reduce the intensity of oxidation of the crucible material, the use of titanium (III) oxide - Ti2O3 instead of the traditionally used titanium (IV) - TiO2 as a source of dopant ions (Ti3+) in the composition of the initial charge is proposed, and the conditions for the synthesis of Ti2O3 by the carbothermic reduction of TiO2 have been developed. Product Description popup.authors Vovk Oleg M. Vovk Olena O. Kryvonogov Sergiy I. Nizhankovskyi Serhii V. Sidelnikova Nataliya S. popup.nrat_date 2023-03-02 Close