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Microhardness and Electron Paramagnetic Resonance Studies of Manganese Doped Lithium Borate Glasses

Author Affiliations

  • 1Department of Physics, D.D.E, Annamalai University, Annamalainagar, Tamil Nadu, INDIA
  • 2 Department of Physics, Annamalai University, Annamalainagar, Tamil Nadu, INDIA

Res. J. Physical Sci., Volume 1, Issue (1), Pages 17-20, February,4 (2013)

Abstract

Microhardness and Electron Paramagnetic Resonance(EPR) measurements are performed on 20 Li2 O-(80-x) B2O3-xMnO glasses (where x = 0,10 to 20 in steps of 2 mol%) have been investigated to find out the role played by Mn2+ on the structure of these glass. These glass samples have been prepared using a conventional melt – quenching method.Microhardness studies revealed that the hardness of the glasses increases with an increase in applied load. Meyer's index number / workhardening exponent 'n' was calculated and found that the material belongs to hard material category. The EPR spectra of all the investigated sample exhibit resonance signals that are characteristic for the Mn2+ ions. The shapes of the spectra are also changed with the increasing of manganese ion content. The resonance line centered at geff ≈ 2.0 has not hyperfine structure and is attributed to coupled Mn2+ ion by dipolar or / and super exchange interactions.

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