Iron modified structural and optical spectral properties of bismuth silicate glasses

Iron bismuth silicate glasses have been successfully synthesized by melt quenching technique. The amorphous nature of the glass samples is ascertained by the XRD patterns. The values of density, molar volume and crystalline volume have been measured and are found to decrease with increase in iron co...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2014-10, Vol.450, p.39-44
Main Authors: Parmar, Rajesh, Kundu, R.S., Punia, R., Aghamkar, P., Kishore, N.
Format: Article
Language:English
Subjects:
Bismuth silicate
Condensed matter
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Differential scanning calorimetry
Disordered solids
DSC
Exact sciences and technology
FTIR
Glass
Glasses
Hydrogenic excitonic model
Iron
Networks
Optical constants: refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Optical properties of bulk materials and thin films
Physics
Raman spectroscopy
Silicon dioxide
Spectra
Structure of solids and liquids
crystallography
X-ray diffraction
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Summary:Iron bismuth silicate glasses have been successfully synthesized by melt quenching technique. The amorphous nature of the glass samples is ascertained by the XRD patterns. The values of density, molar volume and crystalline volume have been measured and are found to decrease with increase in iron content. The glass transition temperature measured using Differential Scanning Calorimetry (DSC) also varies with increase in Fe2O3 content. The Raman and FTIR spectra of the studied glass system taken at room temperature suggests that Fe2O3 modifies the structure of bismuth silicate glasses and it acts as both network modifier as well as network former. Bismuth also plays the role of both network modifier (BiO6 octahedra) as well as network former (BiO3 pyramids) and SiO2 exists in SiO4 tetrahedral structural units with two non-bridging oxygens. The Hydrogenic excitonic model is found to be applicable to the studied glass compositions. The variation in Urbach energy value observed for the studied glass samples suggests the possibility of increase in the number of glass defects. The metallization criterion for the synthesized glass samples is determined and found to be in the range 0.30–0.38.
ISSN:0921-4526
1873-2135
DOI:10.1016/j.physb.2014.05.056