Search academic texts

Information × Registration Number 0308U001659, 0106U003131 , R & D reports Title The phase diagram and mechanisms of the formation frustrated electric and magnetic states of the different types popup.stage_title Теплофізичні властивості змішаних кристалів Head Anders Olexandr Georgiyovich, Registration Date 15-02-2008 Organization Kharkov national university named after V.N. Karazin popup.description2 The objects of the study - monocrystal (CuSO4)(en).2H2O, (CuSO4)(en).2D2O, Cu(phen). The methods of the studies - raman spectroscopy, electronic paramagnetic resonance. The new vibration band with the frequency ~ 3050 sm-1 in the A symmetry Raman spectra at the temperature ~ 170 K was found at the decrease of the temperature beginning from the room temperature. The appearance of the additional vibration band in the first order Raman spectra shows the structure phase transition connected with possible change of the ethylene-diamine local symmetry in the crystal lattice. The energy spectrum of the cluster and the resonance transitions in the EPR spectra for the tetramer with exchange interaction of nearest neighbors and diagonal coupling were calculated. The isotropic and anisotropic exchange interactions were analyzed. In the latter case the Dzjaloshynski-Moria interaction was included. The results of calculation can describe the shape of absorption EPR band of the powder sample of the metal-organic compound CENI. The shape of the band changes considerablegy with temperature. It is shown that this changing is the result of additional resonance transitions between energy levels the intensity of which increases with lowering temperature. Product Description popup.authors popup.nrat_date 2020-04-02 Close