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- Title
Thermal characterization of novel magnesium oxyhalide bismo-borate glass doped with VO ions.
- Authors
Dahiya, M.; Khasa, S.; Agarwal, A.
- Abstract
In the present report, physical and thermal characterizations of magnesium oxyhalide bismuth borate glasses in the composition range of $$ x{\text{Mg}}X_{2} \left( {X = {\text{F}},\,{\text{Br}}} \right) \, \cdot \, \left( {30 - x} \right){\text{MgO }}\cdot \, 50{\text{B}}_{2} {\text{O}}_{3} \cdot \, 20{\text{Bi}}_{2} {\text{O}}_{3} $$ ( x = 0, 2, 5, 7 and 10) containing 2 mol% of VO prepared by standard melt-quench technique have been discussed. The non-crystalline nature of prepared glasses has been identified through peak free X-ray diffraction profiles. Density ( D), molar volume ( V) and oxygen packing density have been measured/calculated, and varying trends are discussed by relating with physical changes governed in prepared glass structures on increasing/changing the halogen (fluoride/bromide) ions. The differential thermal analysis (DTA) and thermogravimetry have been carried out in the temperature range of 200-900 °C. Glass transition temperature ( T) and melting temperature ( T) are determined from the DTA thermographs. The glass stability parameter, T/ T is calculated from the obtained values of characteristic temperatures and a sudden decrease in stability at x = 5.0 is observed in both series which reflects that halide ions (F/Br) modify the glass structure at low concentrations (up to 5.0 mol%) and contribute to glass network formation at high concentrations (>5.0 mol%). Infrared absorption spectra have been recorded in the mid-IR range and evaluated to report the possible cause of band vibrations present in the spectra.
- Subjects
THERMAL analysis; MAGNESIUM oxide; BORATE glass; DOPING agents (Chemistry); METAL ions; THERMAL properties of metals
- Publication
Journal of Thermal Analysis & Calorimetry, 2016, Vol 123, Issue 1, p457
- ISSN
1388-6150
- Publication type
Article
- DOI
10.1007/s10973-015-4913-5