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Int. J. Electroactive Mater. 7 (2019) 53-66

Anomalous Behavior of Optical Properties in Mixed Ionic-Electronic 20Li2O-xBi2O3-(80-x)TeO2 Doped Silver Nanoparticles Tellurite Glass System

ROSDIYANA HISAM1*, M.Siddiq Fadhil Sutrisno2, Nurul Ain Samsudin2

1SCHOOL OF PHYSICS & MATERIAL SCIENCES, UNIVERSITI TEKNOLOGI MARA (UiTM), SHAH ALAM, SELANGOR, Malaysia
2Faculty of Applied Sciences, UNIVERSITI TEKNOLOGI MARA, Shah Alam, Selangor, Malaysia

*Email Address : rosdiyanahisam@gmail.com

Abstract : 20Li2O-xBi2O3-(80-x) TeO2 doped silver nanoparticles mixed ionic-electronic tellurite glass system was prepared using melt-quenching method to study the structural and optical properties of the glasses. Optical band gap for indirect transitions, πΈπΈπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘–π‘– showed a large decrease for x ≀ 13 mol% followed by a slight increase at x=15 mol%. However, optical band gap for direct transitions, πΈπΈπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘–π‘– displayed initial decrease for x ≀ 5 mol% before reaching a maximum at x= 7 mol%. Eu and refractive index n exhibited non-linear behaviors and where both increased for x ≀ 5 mol% with an anomalous drop at x= 7 mol%. The anomalous region between 5 mol% ≀ x ≀ 7 mol% is suggested due to mixed ionic-electronic effect (MIE) attributed from variation of bridging oxygen (BO) and non-bridging oxygen (NBO) concentration.

Keywords : optical energy gap,mixed ionic-electronic,tellurite glass