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The unit cell parameters and the space group of the investigated compound were determined by means of X-ray diffraction.

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Abstract

Kinetic analysis of the crystallization process in Bi4(As2S3)96 and Bi6(As2S3)94 glasses was performed based on DSC curves recorded under non-isothermal measurement conditions. Samples were thermally treated at different heating rates in the temperature range 300–770 K. The activation energy of crystallization E and the pre-exponential factor K 0 are determined by the Kissinger method and the characteristic crystallization parameters m and n of investigated glasses by the Matusita method. For both crystallization processes the glass with 4 at.% of Bi is characterized by the mechanism of volume nucleation, which is manifested in the form of two-dimensional growth at the first crystallization process, and as three-dimensional at the second one. On the other hand, in the sample with 6 at.% Bi, the average value of the parameter m is close to one, which indicates one-dimensional crystal growth. Compatibility of the values of the parameters m and n suggests that this sample has a large number of crystallization centers, which do not increase significantly during the thermal treatment.

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Summary  

The paper describes the results of a study of glasses of the type CuxAs50Se50-xfor x=5, 10 and 15 at.% Cu, by the method of thermomechanical analysis. Values of the thermal coefficients of linear expansion in solid (αg) and visco-plastic (αω) phase were determined. On the basis of the results obtained using the mentioned methods it was possible to determine the specific temperature of the beginning of the softening process of the glass (T g), as well as the temperature of the beginning of the deformation (T ω). It was shown that coefficients of linear expansion decrease with the increase of Cu content. On the other hand, the increase of Cu content caused the increase of the temperatures. The analytical forms of dependence of four physical parameters αg, αω, T g, T ωas a function of the Cu content were fitted.

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Metal complexes with pyrazole-derived ligands

IV. Thermal decomposition of cobalt(II) complexes with 3(5)-anmo-4-acetyl-5(3)-methylpyrazole

Journal of Thermal Analysis and Calorimetry
Authors: A. F. Petrović, S. R. Lukić, D. M. Petrović, E. Z. Ivegeš, and V. M. Leovac

The thermal decomposition of tetrahedral cobalt(II) complexes with 3(5)-amino-4-acetyl5(3)-methylpyrazole (HL) of the general formula [Co(HL)2X2] (X=Cl, Br, I, NCO, NCS) and octahedral [Co(HL)2(H2O)4](NO3)2 and [Co(HL)2−N(CN)2}2] complexes was investigated in air atmosphere in the interval from room temperature to 1000°C. Decomposition of the complexes occurred in several successive endothermic and exothermic processes, and the residue was in all cases CoO.

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