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S. Pal^a, D. Sharma^b, M. Chandra^c, M. Mittal^d, P. Singh^e, M. Lal^f, A. S. Verma^g,h,*
Chalcogenide Letters, Vol.21, No.1, pp. 1-9, 2024, DOI:10.15251/CL.2024.211.1
Abstract In this paper, we present thermodynamic properties such as heat of formation, heat of fusion and entropy of fusion for chalcopyrite structured solids with the product of ionic charges and nearest neighbour distance d (Å). The heat of formation (∆Hf) of these compounds exhibit a linear relationship when plotted on a log-log scale against the nearest neighbour distance d (Å), but fall on different straight lines according to the ionic charge product of the compounds. On the basis of this result two simple heat of formation (∆H_f)——heat of fusion (∆H^F), and heat of formation (∆H_f)——entropy of fusion… More >

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S. A. Kamil^a,b,*, G. Jose^c
Chalcogenide Letters, Vol.21, No.1, pp. 11-20, 2024, DOI:10.15251/CL.2024.211.11
Abstract Er³⁺-ions doped SiO₂-ZnO-Na₂O thin films were fabricated using ultrafast laser plasma doping (ULPD) techniques under different ambient atmospheres; vacuum, nitrogen, oxygen and argon gas. The thickness of the layer produced depends on the ambient atmosphere during fabrication. The layer fabricated under a vacuum is the thinnest among all of the samples. In addition, the surface layer for the sample fabricated under a vacuum environment seems to be relatively smoother compared with those of the others. XRD patterns show that all samples are in a mixed amorphous-crystalline phase. All the Raman spectra exhibited a similar pattern, except More >

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R. Vigi^a, G. R. Štrbac^a, D. D. Štrbac^b,*, O. Bošák^c, M. Kubliha^c
Chalcogenide Letters, Vol.21, No.1, pp. 21-37, 2024, DOI:10.15251/CL.2024.211.21
Abstract The processes of glass-transition and crystallization of chalcogenide glass As₄₀Se₃₀Te₃₀ with 5 at.% silver were analyzed using differential scanning calorimetry. The values of glass-transition temperatures and activation energy were determined. Two crystallization processes were also detected and three-dimensional growth. Using non-isoconversional models the activation energies for both processes amounted to 112(2) kJ/mol and 97(2) kJ/mol. Isoconversional models were used to track changes in activation energy. The presence of Te significantly affects the thermal parameters as well as the structure of the glass while the presence of Ag does not significantly change the degree of connectivity of More >

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G. Hao^a,*, H. J. Hou^a, S. R. Zhang^b, L. H. Xie^c
Chalcogenide Letters, Vol.21, No.1, pp. 39-51, 2024, DOI:10.15251/CL.2024.211.39
Abstract The physical properties of CdS is calculated by using the first principles pseudopotential plane wave method based on density functional theory (DFT). The calculated lattice parameters and elastic constants agree well with other theoretical values, and the crystal is determined to be structurally stable by the Born mechanical stability condition. The Debye temperature, Grüneisen parameters, heat capacity and thermal expansion coefficient of CdS under high temperature and high pressure were studied successfully by using the quasi-harmonic Debye model. The influence of pressure on thermal expansion coefficient and Debye temperature is greater than that of temperature. More >

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N. Kanwal^a, M. Ishfaq^a, S. A. Aldaghfag^b, S. Saleem^a, M. Yaseen^a,*
Chalcogenide Letters, Vol.21, No.1, pp. 53-63, 2024, DOI:10.15251/CL.2024.211.53
Abstract In this work, the electro-optical and magnetic characteristics of Be_1-xCr_xS (x= 6.25%, 12.5% and 25%) are brought into investigation by employing full potential linearized augmented plane wave (FP-LAPW) scheme designed within density functional theory (DFT). The stability of the Be_1-xCr_xS alloy is justified by the negative values of formation energy. The band structures and density of states are examined by using GGA functional. Be_1-xCr_xS compound demonstrates the half-metallic (HM) ferromagnetic behavior for all doping concentrations; spin-up channel reveals the metallic character and other spin version displays the semiconductor (SC) behavior. The values of total magnetic moment (µB) More >

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K. I. Hussain^a, A. Ashour^b, E. S. Yousef^c, E. R. Shaaban^b,d,*
Chalcogenide Letters, Vol.21, No.1, pp. 65-80, 2024, DOI:10.15251/CL.2024.211.65
Abstract The present work has examined the thermal features of glassy chacogenide materials Se0.75-xTe0.25Agx (x = 0, 2, 4, 6, 8, 10 at %). The thermal stability of these compositions has been assessed under non-isothermal conditions using Differential Scanning Calorimetry (DSC), which has been used to find the glass transition temperature (Tg), the initial crystallization temperature (Tin), the temperature corresponding to the top of the crystallization rate (Tp), and the melting temperature (Tm). In addition, the kinetic parameter Kr(T) was given as an additional sign of thermal stability. Among these compositions, it was discovered that Se0.71Te0.25Ag0.04… More >

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A. A. Ahmed^a, G. G. Ali^b,*, N. A. Daham^a
Chalcogenide Letters, Vol.21, No.1, pp. 81-97, 2024, DOI:10.15251/CL.2024.211.81
Abstract In this work, copper sulfide (CuS) nanostructure was deposited on a porous silicon wafer for the visible light by spray pyrolysis method. Through this, a series of devices were suggested as a part of the deposit concentration of CuS on n-type porous silicon. Simultaneously, the physical features of the attained film were illustrated. FESEM exhibited that the average nanoparticle diameter increased with the concentration of CuS at orientation (100) and was found to be 47.84 nm, 56.36nm and 71.32nm, while the average diameter at (111) orientation was found to be 37.64 nm, 41.46nm, 55.22 nm… More >

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A. B. Alwany^a,*, A. Alnakhlani^a,b, B. Hassan^a,b, M. A. Algradee^a, R. A. Fouad^b, A. A. Alfaqeer^c
Chalcogenide Letters, Vol.21, No.1, pp. 99-112, 2024, DOI:10.15251/CL.2024.211.99
Abstract Thermal evaporation technique was used to prepare Cu₁₃Se₅₂Bi₃₅ thin films. The asdeposited and annealed samples were investigated by using the X-ray diffraction (XRD), scanning electron microscopy (SEM) and optical transmission and reflection. The XRD showed that the as-deposited film is crystalline in nature, and the crystalline size of samples increased with increasing the annealing temperature. SEM images showed that the morphology of the sample changes with the annealing temperature. The direct transition of the optical band gap (E_g) of Cu₁₃Se₅₂Bi₃₅ films was observed and the values of E_g decreased with increasing the annealing temperature. Other optical parameters More >

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