S. N. Garibova^a,b,*, А. I. Isayev^a, S. A. Rzayeva^a, F. N. Mammadov^c

Chalcogenide Letters, Vol.22, No.1, pp. 1-9, 2025, DOI:10.15251/CL.2025.221.1

Abstract The structure particulars of amorphous Ge2Sb2Te5 thermally evaporated on glass substrates, as well as films annealed at temperatures of 500 and 700 K have been studied by the considering of experimentally established facts obtained from X-ray analysis and Raman spectroscopy measurements. The Debye-Scherrer and Williams-Hall methods were applied to the X-ray diffraction data for estimate the size of crystallites, interatomic distances, dislocation density and structure distortion degree. The features of heat treatment effect on numerical values of the above quantities at a given temperatures have been established. The analysis of the spectral distribution of Raman… More >

K. N’dri^*, B. M. Dally, C. Vamoussa, D. Houphouët-Boigny

Chalcogenide Letters, Vol.21, No.3, pp. 255-262, 2024, DOI:10.15251/CL.2024.213.255

Abstract Glasses of Sb₂S₃-As₂S₃ system with nominal composition of As_0,4xSb_0,4(100-x)S₆₀(where x= 10, 25, 50, 75 and 100 mol% As₂S₃) were investigated by different quenching methods and Raman spectroscopy. All studied samples were in the vitreous state. The average coordination number (Z), being equal to 2.4, has indicated that the numbers of neighbors of non-chalcogens (As and Sb) and chalcogens (S and Te) atoms were respectively 3 and 2. These coordination numbers were conditions fulfilled by the atoms to obtain vitreous materials. The vibrations of the SbS₃ and AsS₃ structural units dominated the Raman spectra of the studied Sb₂S₃-As₂S₃ glasses. More >

K. Turmanova^a, O. Prikhodko^a, Zh. Tolepov^a, S. Maksimova^a, N. Manabaev^b, N. Almas^c,*

Chalcogenide Letters, Vol.21, No.7, pp. 575-581, 2024, DOI:10.15251/CL.2024.217.575

Abstract In this study, we used Raman spectroscopy to compare the local structure of Ge2Sb2Te5 (GST) thin films with thicknesses of 90 nm and 271 nm that were crystallized through thermal annealing and laser radiation (laser annealing) during the recording of Raman spectra in situ. We found that for all crystallized films, the position of the main peaks in the Raman spectra was almost the same, and their structure corresponded to a hexagonal close packed state. It is noteworthy that the full width at half maximum (FWHM) of the main peaks varies considerably depending on the More >

Prabhakar Misra^1,*, Hawazin Alghamdi¹, Raul Garcia-Sanchez¹, Wyatt Mitchell², Allison Powell³, Nikhil Vohra⁴

The International Conference on Computational & Experimental Engineering and Sciences, Vol.31, No.4, pp. 1-1, 2024, DOI:10.32604/icces.2024.013296

Abstract Semiconducting quantum dots (Q-dots) with strain-tunable electronic properties are good contenders for quantum computing devices, as they hold promise to exhibit a high level of photon entanglement. The optical and electronic properties of Q-dots vary with their size, shape, and makeup. An assortment of Q-dots has been studied, including ZnO, ZnS, CdSe and perovskites [1]. We have employed both Raman spectroscopy (to precisely determine their vibrational frequencies) and UV-VIS spectroscopy (to determine accurately their band gap energies). The electronic band structure and density of states of the ZnO and ZnS Q-dots have been investigated under More >

Stefan M. Kolašinac¹, Zora P. Dajić Stevanović^1,*, Sofija N. Kilibarda¹,  Aleksandar Ž. Kostić^2,*

Phyton-International Journal of Experimental Botany, Vol.90, No.4, pp. 1041-1062, 2021, DOI:10.32604/phyton.2021.015996 - 27 April 2021

Abstract Carotenoids represent a large group of mainly red, orange, and yellow natural metabolites mainly involved in regulation of many metabolic processes. Carotenoids are beneficial for human health. Current study describes the importance, chemical composition and functioning of carotenoids. It is well known that carotenoids support pigments acting in light absorbance mechanisms during photosynthesis, and are known to protect the chlorophyll molecules from oxidative stress and reactive oxygen species (ROS) damage. Carotenoids are involved in signaling processes in plants, responses to environmental stresses, pollination, germination and reproduction, and development regulation. As nutrients of strong antioxidant activity… More >