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S. N. Yasinova^a,*, S. I. Mekhtiyeva^b, M. H. Huseynaliyev^a, R. I. Alekberov^b
Chalcogenide Letters, Vol.21, No.5, pp. 377-383, 2024, DOI:10.15251/CL.2024.215.377
Abstract Structural properties of PbSe, PbS and PbS_0.5Se_0.5 thin films and mechanisms of combinational scattering of light from phonons were studied by X-ray diffraction and Raman spectroscopy methods. The results of X-ray diffraction show that the crystallite sizes found in the thin layers of the studied substances are in the order of nanometers and vary in the interval d~10.7 ÷ 30.8 nm. It was determined that the scattering bands of the PbSe_0.5S_0.5 sample with large nanoparticle sizes shift to the region of large wave numbers compared to the scattering bands observed in the region of low wave More >

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A. J. Soud, Bushra K. H. Al-Maiyaly
Chalcogenide Letters, Vol.21, No.5, pp. 385-394, 2024, DOI:10.15251/CL.2024.215.385
Abstract Copper Zinc Sulphide (Cu_0.5Zn_0.5S) alloy and thin films were fabricated in a vacuum. Nano crystallized (CZS) film with thick 450±20 nm was deposit at substrates glasses using thermal evaporation technique below ~ 2 × 10⁻⁵ mbar vacuum to investigated the films structural, morphological and optical properties depended on annealing temperatures ( as-deposited, 423, 523 and 623) K for one hour. The influences annealed temperature on structurally besides morphologically characteristics on these films were investigated using XRD and AFM respectively. XRD confirms the formation a mixed hexagonal phase of CuS-ZnS in (102) direction with polycrystalline in nature More >

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X. Y. Gao^*, P. Lu, Z. M. Xu, G. G. Tang
Chalcogenide Letters, Vol.21, No.5, pp. 395-405, 2024, DOI:10.15251/CL.2024.215.395
Abstract g-C₃N₄ has a strong C-N covalent bond within the monolayer and a weak van der Waals force between the lamels, which enables it to have similar lubrication properties to other two-dimensional layered materials. In this study, a new type of g-C₃N₄/MoS₂/ZnS heterogeneous nanocomposites was prepared by a one-step hydrothermal method XRD, SEM, FI-IR, and other methods were used to systematically study it. Furthermore, a ball-on-disk tribometer extensively examined the tribological behavior of g-C₃N₄/MoS₂/ZnS heterojunction in pure oil. The relationship between applied load and rotational speed on performance is also revealed. Compared with g-C₃N₄ and g-C₃N₄/MoS₂ nanocomposites, g-C₃N₄/MoS₂/ZnS has More >

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A. Mustafa^*, S. Turki Al-Rashid
Chalcogenide Letters, Vol.21, No.5, pp. 407-411, 2024, DOI:10.15251/CL.2024.215.407
Abstract Applying the cohesive energy model, this research theoretically studies how the size of nanoparticles affects their optical characteristics. The findings demonstrate that optical characteristics are size-dependent for nanoparticles, with an exponentially growing energy gap for nanoparticles on a scale of less than 4 nm. As the size of nanoparticles is reduced, the absorption wavelength also decreases. Compounds undergo a transition to a higher energy spectral area (blue shift) when their wavelength decreases; this change can make these compounds effective in certain optical nanodevices. More >

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N. A. Noor^a,*, F. Nasrullah^a, Ihab M. Moussa^b, S. Mumtaz^c
Chalcogenide Letters, Vol.21, No.5, pp. 413-421, 2024, DOI:10.15251/CL.2024.215.413
Abstract To comprehend the mechanical, electronic, and magnetic properties of chalcogenides HgSm₂S/Se₄, a DFT-oriented thorough investigation is carried out. The elastic constants and spin-dependent electrical characteristics are determined by using the PBEsol-GGA functional and (mBJ) potential correspondingly. Through optimization, a sufficient amount of energy is discharged by the FM state as compared to nonmagnetic states. By investigating Born stability criteria and formation energy, the structural stabilities of both spinels are verified. The calculated Poisson's and Pugh's ratios showed that both spinels are ductile. The estimation of Curie temperature has supported the existence of a ferromagnetic nature More >

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P. Chaiworn^a, S. Kaewja^a, E. Wongrat^b,c, C. Wichasilp^a, A. Tubtimtae^d,*
Chalcogenide Letters, Vol.21, No.5, pp. 423-429, 2024, DOI:10.15251/CL.2024.215.423
Abstract Bismuth antimony telluride (Bi_2-xSb_xTe₃) thin films were synthesized using chemical bath deposition (CBD) with various amounts of antimony. The structural, morphological, and optical properties of Bi_2-xSb_xTe₃ thin films have been scrutinized using X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), UV-Vis spectrophotometry. A higher amount of Sb contents can be observed the Sb_0.405Te_0.595, BiTe, and Bi₄Te₃ phases consisted in the pattern. Meanwhile, the energy band gaps are tuned in the range of 2.95 to 3.30 eV. Finally, measurement of resistance with various temperatures for activation energy (E_AC) estimation was performed. The highest E_AC value was equal to 0.654 More >

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G. S. Amirbekova^a, Zh. K. Tolepov^a,*, N. Guseinov^a, M. A. Tulegenova^a, T. Kuanyshbekov^b
Chalcogenide Letters, Vol.21, No.5, pp. 431-437, 2024, DOI:10.15251/CL.2024.215.431
Abstract Lead telluride nanostructures were obtained on silicon substrates by thermal evaporation in vacuum. Growth occurred at three different distances between the evaporation source and the substrate. The distances between the evaporator and the evaporation source were 5 cm; 7.5 cm and 10 cm. Structural characteristics were studied using XRD, SEM, EDX, AFM analyses. These methods provided information about the crystal structure, morphology, microstructure and elemental composition of the material. X-ray diffraction analysis showed that thin films of lead telluride obtained by thermal evaporation in vacuum have a cubic crystal structure. This experimental work was carried More >

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W. H. Albanda^a, M. H. Saeed^a, M. Z. Abdullah^b, M. H. Al-Timimi^c,*
Chalcogenide Letters, Vol.21, No.5, pp. 439-447, 2024, DOI:10.15251/CL.2024.215.439
Abstract In this study, CdS: MgO films were synthesized using the chemical spray pyrolysis method, varying the film thickness. X-ray diffraction (XRD) analysis confirmed the polycrystalline nature of the films, with an observed increase in average crystallite size corresponding to thicker films, and The films' surface morphology indicates an absence of crystal defects such as holes and voids . The investigation of energy gap and optical parameters revealed a dependency on film thickness, with the energy gap shifting from 2.412 eV for a thickness of 150 nm to 2.354 eV for a thickness of 750 nm. More >

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