Research & reviews journal of physics (vol3, issue2) by STM Journals Publication

ISSN 2347-9973

Research & Reviews: Journal of Physics (RRJoPHY)

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Research & Reviews : Journal of Physics

Contents

1. First Principles Band-gap Calculations of 3d Transition Metals-added Rock-salt ZnO M. Ashraf, A. Afaq

2. Fragility of Ge40S60 Glass Forming Liquid G. Saffarini, A. Saiter, J. M. Saiter

3. High-Spin Structure in 192-196Pt Isotopes Huda H. Kassim, Fadhil . Sharrad

4. Compositional and Optical Properties of Sb Doped ZnO Thin Films Bhuiyan M. R. A., Begum J., Hoq E.

Research & Reviews: Journal of Physics ISSN: 2278-2265 (online), ISSN: 2347-9973 (print) Volume 3, Issue 2 www.stmjournals.com

First Principles Band-gap Calculations of 3d Transition Metals-added Rock-salt ZnO M. Ashraf, A. Afaq* Centre of Excellence in Solid State Physics, University of the Punjab Lahore, Pakistan Abstract The band-gaps of rock-salt Zinc Oxide added with 3d transition metals (TM = Mn, Fe, Co, Ni) are estimated by Density Functional Theory (DFT) as implemented in the WIEN2k code. We employed Full Potential Linearized Augmented Plane Wave (FPLAPW) method, within the Local Density Approximation (LDA) and the Generalized Gradient Approximation (GGA), in order to find band-structures of Zn1-x(TM)xO alloys at x = 25, 50, and 75%. The results showed metallic nature for all TM-doped ZnO alloys, contrary to the semiconducting nature as predicted by the experimentalists. This reveals an inadequacy of simple LDA and GGA schemes for band-gap calculations of highly correlated systems as in our case.

Keywords: Band-gaps, Density Functional Theory, Transition Metals, LDA, GGA

Research & Reviews: Journal of Physics ISSN: 2278-2265 (online), ISSN: 2347-9973 (print) Volume 3, Issue 2 www.stmjournals.com

Fragility of Ge40S60 Glass Forming Liquid G. Saffarini1*, A. Saiter2, J. M. Saiter2 1

Physics Department, An-Najah National University, Nablus, Palestinian Authority Laboratoire PBM, UMR 6522, LECAP, Institut des Matériaux de Rouen, Faculté des Sciences, Avenue de l’Université BP 12, 76801 Saint Etienne du Rouvray, France

Abstract From differential scanning calorimetry (DSC) measurements performed on Ge40S60 chalcogenide glass forming liquid, the values of the apparent activation energy ∆h*, and the fragility index, m, as defined in the strong-fragile glass forming liquid concept, have been determined. The calculated value of m for this glass forming liquid is equal to 82. From this m value, it is suffice to conclude that this glass forming liquid belongs to an intermediate category that exhibits a kinetic behaviour between strong and fragile. PACS: 61.43.Fs; 64.70.Pf; 65.60. +a

Keywords: Strong-fragile concept, Ge-S glasses, Differential scanning calorimetry

Research & Reviews: Journal of Physics ISSN: 2278-2265 (online), ISSN: 2347-9973 (print) Volume 3, Issue 2 www.stmjournals.com

High-Spin Structure in 192-196Pt Isotopes Huda H. Kassim, Fadhil I. Sharrad* Department of Physics, College of Science, University of Kerbala, Karbala, Iraq Abstract

The 192-196Pt isotopes with proton number Z=78 and neutron numbers (n) are 114,116, and 118 in O(6) region were investigated. The energy level, E2 transition probabilities, and the potential energy surface have been calculated within the framework using Interacting Boson Model (IBM-1). The calculated results are compared with the most recent experimental data. Good agreements are obtained between the theoretical and experimental results for 192-196Pt isotopes. The contour plot of the potential energy surfaces shows that the interested nuclei are deformed and have Îł-unstable-like characters.

Keywords: IBM-1, Neutron-rich, B(E2) values, Energy levels, Potential energy surface *Author for Correspondence E-mail: fadhil.altaie@gmail.com

Research & Reviews: Journal of Physics ISSN: 2278-2265 (online), ISSN: 2347-9973 (print) Volume 3, Issue 2 www.stmjournals.com

Compositional and Optical Properties of Sb Doped ZnO Thin Films Bhuiyan M. R. A.1*, Begum J.2, Hoq E.1 1

Department of Applied Physics, Electronics and Communication Engineering, Islamic University, Kushtia, Bangladesh 2 Experimental Physics Division, Atomic Energy Centre, Dhaka, Bangladesh

Abstract Sb doped ZnO thin films were deposited onto cleaned glass substrates at different substrate temperature by using thermal evaporation method in vacuum. The atomic compositions of the grown films have been determined by Energy Dispersive Analysis of X-ray (EDAX) method by using an attachment to the Scanning Electron Microscope. The optical properties were measured in the photon wavelength ranging in between 300 and 2500 nm by using a UV-VIS-NIR spectrophotometer. An EDAX spectrum reveals that Sb is doped into the ZnO thin films. The film shows higher transmittance in infrared regions and reflectance in UV regions. The films have high absorption co-efficient (~105 cmď&#x20AC;1) above the fundamental absorption region that direct allowed transitions band gap. The band gap energy of the films found from 2.409 to 2.929 eV for substrate temperature variation. Keywords: Sb doped ZnO, Compositional properties, Optical properties, Band gap energy