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L. Yang^a,b,c, G. J. Zhou^a,b,c, C. G. Lin^a,b,c,*
Chalcogenide Letters, Vol.20, No.1, pp. 1-9, 2023, DOI:10.15251/CL.2023.201.1
Abstract Ge_12.5Se_87.5-xTe_x (0≤x≤45) glasses were selected for elucidating the composition-dependent properties and network structure of Te-containing glasses. With increasing Te content (x), Vickers hardness (H_v) and glass transition temperature (T_g) initially increased and then decreased, showing a compositional threshold at x=27.5. It is found that the compositional trend of H_v and T_gg is in good accordance with the structural evolution studied by Raman spectra. The results suggest that the introduction of Te leads to the evolution of the network connectivity and average bond strength of Ge_12.5Se_87.5-xTe_x glass structure, which imposes an opposite impact on the structural properties (H_v and T_g). More >

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K. A. Mohammed^a,*, A. M. Ajam^a, A. Kareem^a, K. H. Salem^b, M. A. Alkhafaji^c, R. S. Zabibah^d
Chalcogenide Letters, Vol.20, No.1, pp. 11-17, 2023, DOI:10.15251/CL.2023.201.11
Abstract In current work, Nanoparticles of cadmium zinc sulfide (CdZnS) and copper zinc sulfide (Cu:CdZnS) were synthesized through a capping-agent-free chemical co-precipitation method. This article focuses on the optical characteristics, elemental analysis, and surface morphology of CdZnS and Cu:CdZnS. this properties of prepared materials were investigated using a variety of techniques, including X-ray diffraction (XRD), scanning electron microscopy, energy dispersive X-ray, and ultraviolet–visible absorption. The results show both pure and doped CdZnS have cubic structure. The energy gap of CdZnS was equal to 3.14 eV and 3.4 eV for Cu doped CdZnS. According to the results More >

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A. B. Alwany^a,b,*, G. M. Youssef^b, M. A. Algradee^a, M. A. Abdel-Rahim^c, A. Alnakhlani^a,d, B. Hassan^a,d
Chalcogenide Letters, Vol.20, No.1, pp. 19-31, 2023, DOI:10.15251/CL.2023.201.19
Abstract Thin films of Zn₅₀Se₅₀ were prepared by the vacuum evaporation technique on glass substrates. The influence of annealing temperature (T_ann.) on the structural and optical properties of ZnSe polycrystalline films was investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM) and optical transmittance T (λ). The crystalline phases that were found in the Zn₅₀Se₅₀ thin films are ZnSe, Se and Zn. The refractive index (n) and the thickness of the films (d) were calculated using Swanepoel’s method for the films annealed at (423 K). The mechanism of optical absorption follows the rule of direct transition. The values More >

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A. Zaidi^a, K. Tiwari^a, R. R. Awasthi^b, K. C. Dubey^c,*
Chalcogenide Letters, Vol.20, No.1, pp. 33-41, 2023, DOI:10.15251/CL.2023.201.33
Abstract In the present investigation ZnO thin films have been prepared by sol-gel spin coating technique with different pH values. The effect of pH values of precursor solution on the crystal structural, morphological and humidity sensing properties of ZnO nanostructures have been investigated using different characterization technique. The crystal structure and phase analysis has been examined by powder X-ray diffraction (PXRD) technique. The PXRD pattern clearly revealed the ZnO thin films have hexagonal wurtzite crystal structure. The average crystallite size of ZnO thin films have been calculated using Scherer formula and found to be ~24 nm… More >

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M. S. Alqahtani^a,b,c,*, F. Alqahtani^d, A. M. Almarhaby^e, K. I. Hussain^a,f, Y. Khalid^a, H. Almohiy^b, I. S. Yaha^c,g, El S. Yousef^c,d
Chalcogenide Letters, Vol.20, No.1, pp. 43-54, 2023, DOI:10.15251/CL.2023.201.43
Abstract Because of the increased use of ionizing radiation, radiation management and security procedures are now regarded a standard part of many therapeutic and specialist fields. The focus of this work is on the radiation security features of Novel Oxide Glass (PZBKTANEr). The unique glass assembly is 40P2O5-30ZnO- 20BaF2-3.8K2TeO3- 1.2Al2O3-5Nb2O5-3Er2O3 in mol percent (test code PZBKTANEr). For the suggested oxide glass, several radiation shielding characteristics have been investigated for a specific energy range of ionizing radiation. The linear and mass attenuation coefficients, mean free path, half-value layer, total nuclear and electronic cross-sections, and fast neutron expulsion More >

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S. W. Xu^*, T. W. Liang, X, Y, Zhu
Chalcogenide Letters, Vol.20, No.1, pp. 55-62, 2023, DOI:10.15251/CL.2023.201.55
Abstract We have prepared a group of Ge_xAs₁₀Se_90-x glass(x=5, 10, 15, 20, 25, 30, and 35 at. %) and investigated their structure and physical properties. It was found that, the minimum refractive index and maximum optical bandgap occur in Ge₂₅As₁₀Se₆₅ glass that is chemically stoichiometric. Analysis of Raman spectra of the glasses indicated that the number of the Ge-Ge, As-As, and Se-Se homopolar bonds is closely related to the bandgap, because the band-tails formed by homopolar bonds could reduce the optical bandgap. The transition behavior of the structural units and physical properties of the glasses occurs at More >

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R. S. Ali^a,*, H. S. Rasheed^b, N. F. Habubi^c, S. S. Chiad^b
Chalcogenide Letters, Vol.20, No.1, pp. 63-72, 2023, DOI:10.15251/CL.2023.201.63
Abstract A thin film of iron disulfide (FeS₂) and Mn-doped was prepared using the chemical spray pyrolysis (CSP) method at a constant temperature of the glass substrate at around 400 °C. According to XRD examination, films were structurally cubic oriented with a predominant planar orientation (201). The doping of Mn ions in the FeS₂ host matrix was confirmed by a minor shift of the diffraction peak towards the lower 2θ values. The surface of the produced film for pyrite was homogeneous, according to the AFM investigations. According to the XRD data, the predicted grain size altered as More >

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J. Kumari^a, C. Singh^b, R. Agrawal^c, B. L. Choudhary^a, A. S. Verma^d,e,*
Chalcogenide Letters, Vol.20, No.1, pp. 73-83, 2023, DOI:10.15251/CL.2023.201.73
Abstract Herein, we have inquired the structural, electronic and thermoelectric properties of the couple of chalcopyrite structured solids LiAlX₂ (X=S and Se) with the help of density functional theory (DFT), which is tracked by resolution of the Boltzmann transport equation with the constant relaxation time calculations. The LDA (Localized Density Approximation), PBE (Perdew-Burke-Ernzerhof), PBEsol (PBE functional revised for solids) and WC (Wu-Cohen) exchange correlation potentials have been used. The calculated lattice constants a = 5.271 Å; c = 10.178 Å and a = 6.226 Å; c = 12.165 Å for LiAlS₂ and LiAlSe₂ respectively and the band gap… More >

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