Vibrational, Optical and EPR studies of TeO₂-Nb₂O₅-Al₂O₃-V₂O₅ glass system doped with vanadium

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• 作者：Swapna ; G. Upender ; M. Prasad ; ^{prasad5336@yahoo.co.in" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Tellurite glasses ; FTIR ; Raman ; Optical absorption ; EPR
• 刊名：Optik - International Journal for Light and Electron Optics
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：127
• 期：22
• 页码：10716-10726
• 全文大小：1193 K

文摘

Tellurium niobate glasses containing aluminum oxide have been prepared from the conventional melt quenching technique. Optical band gap (E_opt), Urbach energy (ΔE), refractive index (n), optical basicity (Ʌ), and electronic polarizability (α) were determined from optical absorption data. Variation in the network configuration is studied by Fourier transform infrared (FTIR) and Raman spectroscopy measurements. From FTIR and Raman studies it is clear that the glass consists of [TeO₃] and [TeO₄] and [NbO₆] structural units. The glass transition temperature (T_g) of the glasses are studied by Differential scanning calorimetry (DSC). Increase in the glass transition temperature (T_g) with increase in the Nb₂O₅ is observed. The Spin Hamiltonian parameters of VO²⁺ ions showed a linear decrease with increase in the Nb₂O₅. EPR results suggest that VO²⁺ occupies octahedral site with tetrahedral compression. From optical, structural and thermal studies it is clear that the variation in the niobium content in the glass does affect the structural arrangement of atoms inside the glass network and also enhance the optical properties.