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dc.contributor.authorKhor, Shing Fhan, Dr.
dc.contributor.authorZainal Abidin, Talib, Prof. Dr.
dc.contributor.authorMohd Fareq, Abd. Malek, Dr.
dc.contributor.authorCheng, Ee Meng, Dr.
dc.date.accessioned2013-02-04T07:31:22Z
dc.date.available2013-02-04T07:31:22Z
dc.date.issued2013-01
dc.identifier.citationOptical Materials, vol. 35 (3), 2013, pages 629-633en_US
dc.identifier.issn0925-3467
dc.identifier.urihttp://www.sciencedirect.com/science/article/pii/S0925346712004338
dc.identifier.urihttp://dspace.unimap.edu.my/123456789/23353
dc.descriptionLink to publisher's homepage at http://www.elsevier.com/en_US
dc.description.abstractTernary zinc magnesium ultraphosphate glasses corresponding to (ZnO)x (MgO)30 x (P2O5)70 were prepared by melt quenching technique in the range of 5 6 x 6 20 mol%. The optical absorption spectra of the glasses were measured at room temperature in the wavelength range between 190 and 1100 nm, and the refractive indices of the glasses were measured at room temperature at a wavelength of 632.8 nm. The optical absorption spectra indicated that the electronic transition was indirect and associated with the phonon-assisted transition. From the absorption spectra, the optical energy band gap (Eopt ) and Urbach energy (EU) values for all of the glass samples were calculated from their ultraviolet edges. The values of Eopt and EU were found to be in the range of 3.54–3.81 eV and 0.27–0.45 eV, respectively, both of which vary in a non-linear manner, with a turning point at 15 mol% of ZnO. The composition-dependence of these values has been suggested and analyzed in the light of switching role of Mg 2+ based on its anomalous natural behavior from network builder to modifier depending upon its concentration. The values of refractive index ranged from 1.513 to 1.534. Variations in these optical parameters, as well as variations in density and molar volume are discussed and correlated with the structural changes within the glassy matrixen_US
dc.language.isoenen_US
dc.publisherElsevier B.V.en_US
dc.subjectOptical propertiesen_US
dc.subjectPhosphate glassesen_US
dc.subjectRefractive indexen_US
dc.titleOptical properties of ultraphosphate glasses containing mixed divalent zinc and magnesium ionsen_US
dc.typeArticleen_US
dc.contributor.urlsfkhor@unimap.edu.myen_US
dc.contributor.urlzainalat@science.upm. edu.myen_US
dc.contributor.urlmfareq@unimap.edu.myen_US
dc.contributor.urlemcheng@unimap.edu.myen_US


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