Mixed alkali effect in glasses containing MnO{sub 2}

Journal Article · Tue Feb 05 00:00:00 EST 2013 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4791189· OSTI ID:22116010

Reddy, M. Sudhakara; Rajiv, Asha ^[1]; Veeranna Gowda, V. C. ^[2]; Chakradhar, R. P. S. ^[3]; Reddy, C. Narayana ^[4]

---

1. Department of Physics, Jain University, Bangalore (India)
2. Department of Physics, GovernmentCollege for Women, Chintamani (India)
3. CSIR-National Aerospace Laboratories, Bangalore (India)
4. Department of Physics, Maharani's Science College for Women (PG centre, Bangalore University) Bangalore (India)

Glass systems of the composition xLi{sub 2}O-(25-x)K{sub 2}O-70(0.4ZnO+0.6P{sub 2}O{sub 5})+5MnO{sub 2} (x = 4,8,12,16 and 20 mol %) have been prepared by melt quenching technique. The thermal and mechanical properties of the glasses have been evaluated as a function of mixed alkali content. Glass transition temperature and Vickers's hardness of the glasses show a pronounced deviation from linearity at 12 mol%Li{sub 2}O. Theoretically estimated elastic moduli of the glasses show small positive deviations from linearity. MAE in these properties has been attributed to the localized changes in the glass network. The absorption spectra of Mn{sup 2+} ions in these glasses showed strong broad absorption band at 514 nm corresponding to the transition {sup 6}A{sub 1g}(S){yields}{sup 4}T{sub 1g}(G), characteristic of manganese ions in octahedral symmetry. The fundamental absorption edge in UV region is used to study the optical transitions and electronic band structure. From UV absorption edge, optical band gap energies have been evaluated. Band gap energies of the glasses have exhibited MAE and shows minimum value for 12 mol%Li{sub 2}O glass.

• OSTI ID: 22116010
• Journal Information: AIP Conference Proceedings, Vol. 1512, Issue 1; Conference: 57. DAE solid state physics symposium 2012, Mumbai (India), 3-7 Dec 2012; Other Information: (c) 2013 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION SPECTRA
CONCENTRATION RATIO
ELASTICITY
ELECTRONIC STRUCTURE
ENERGY GAP
LITHIUM OXIDES
MANGANESE IONS
MANGANESE OXIDES
PHOSPHATE GLASS
POTASSIUM OXIDES
QUENCHING
TRANSITION TEMPERATURE
ULTRAVIOLET SPECTRA
VICKERS HARDNESS
VISIBLE SPECTRA
ZINC COMPOUNDS