Luminescence of F2 and F3 + centres in LiF crystals irradiated with 12 MeV 12C ions

Dependences of the nanohardness and photoluminescence of F 2 and F 3 + centers on the depth in LiF crystals irradiated with 12 MeV 12 C ions to fluences 10 10 -10 15 ions/cm 2 were studied using laser scanning confocal microscopy, luminescent spectroscopy, and the nanoindentation method. The nanohardness measurements showed a significant hardening effect at the end of the ion run with the dominant contribution of defects formed by the mechanism of elastic collisions. The observed attenuation of the luminescence intensity at high fluences is associated with the intense nucleation of dislocations as traps for aggregate color centers.The work was carried out within the framework of the grant GF AP05134257 of the Ministry of Education and Science of the Republic of Kazakhstan; Institute of Solid State Physics, University of Latvia as the Center of Excellence has received funding from the European Union’s Horizon 2020 Framework Programme H2020-WIDESPREAD-01-2016-2017-TeamingPhase2 under grant agreement No. 739508, project CAMART

Ion track template technique for fabrication of ZnSe2O5 nanocrystals

The work was performed under the grant of the Ministry of Education and Science of the Republic of Kazakhstan AP05134367 and Latvian grant lzpZnSe2O5 nanocrystals with an orthorhombic structure were synthesized by electrochemical deposition into a-SiO2/n-Si ion track template formed by 200 MeV Xe ion irradiation with the fluence of 107 ions/cm2. The lattice parameters determined by the X-ray diffraction and calculated by the CRYSTAL computer program package are very close to each other. It was shown that ZnSe2O5 has a direct band gap of 2.8 eV at the Γ-point. In addition, the calculated charge distribution and chemical bonds show that the crystal has an ion-covalent nature. The photoluminescence excited by photons at 300 nm has a low intensity arising mainly due to zinc and oxygen vacancies.Ministry of Education and Science of the Republic of Kazakhstan AP05134367; Institute of Solid State Physics, University of Latvia as the Center of Excellence has received funding from the European Union’s Horizon 2020 Framework Programme H2020-WIDESPREAD-01-2016-2017-TeamingPhase2 under grant agreement No. 739508, project CAMART

New Method of Synthesis of ZnSe2O5 Nanocrystals

Секция 4. Формирование наноматериалов и наноструктур = Section 4. Formation of Nanomaterials and NanostructuresThe paper presents the results of an experimental and theoretical study of zinc diselenide nanocrystals obtained by electrochemical deposition in а-SiO2/Si-n track template. The track template SiO2/Si was obtained by irradiation on a DC-60 cyclotron with Xe ions with an energy of 200 MeV (Φ = 10 8 ions/cm2) followed by chemical etching in an aqueous solution of hydrofluoric acid (HF). Electrochemical deposition (ECD) in the track template was carried out in potentiostatic mode. The surface of the samples after deposition was examined using a JSM 7500F scanning electron microscope. X-ray diffraction analysis (XRD) was performed using a D8 ADVANCE ECO X-ray diffractometer. According to X-ray diffraction data, electrodeposition of zinc in the a-SiO2/Si-n track template led to the formation of ZnSe2O5 nanocrystals with an orthorhombic crystal structure. The experimental parameters of the crystal lattice, the density of the crystal, the effective charge, and the population of the chemical bond are in good agreement with the results of quantum chemical calculations performed in the approximation of linear combinations of atomic orbitals and other literature data.The work was performed within the framework of the grant project AP05134367 “Synthesis of nanocrystals in SiO2/Si track templates for sensory, nano - and optoelectronic applications”. The authors are grateful to prof. A. Akylbekov and prof. M. Zdorovets for valuable comments and advice

New Method of Synthesis of ZnSe2O5 Nanocrystals

Секция 4. Формирование наноматериалов и наноструктур = Section 4. Formation of Nanomaterials and NanostructuresThe paper presents the results of an experimental and theoretical study of zinc diselenide nanocrystals obtained by electrochemical deposition in а-SiO2/Si-n track template. The track template SiO2/Si was obtained by irradiation on a DC-60 cyclotron with Xe ions with an energy of 200 MeV (Φ = 10 8 ions/cm2) followed by chemical etching in an aqueous solution of hydrofluoric acid (HF). Electrochemical deposition (ECD) in the track template was carried out in potentiostatic mode. The surface of the samples after deposition was examined using a JSM 7500F scanning electron microscope. X-ray diffraction analysis (XRD) was performed using a D8 ADVANCE ECO X-ray diffractometer. According to X-ray diffraction data, electrodeposition of zinc in the a-SiO2/Si-n track template led to the formation of ZnSe2O5 nanocrystals with an orthorhombic crystal structure. The experimental parameters of the crystal lattice, the density of the crystal, the effective charge, and the population of the chemical bond are in good agreement with the results of quantum chemical calculations performed in the approximation of linear combinations of atomic orbitals and other literature data.The work was performed within the framework of the grant project AP05134367 “Synthesis of nanocrystals in SiO2/Si track templates for sensory, nano - and optoelectronic applications”. The authors are grateful to prof. A. Akylbekov and prof. M. Zdorovets for valuable comments and advice