期刊
MATERIALS RESEARCH BULLETIN
卷 46, 期 12, 页码 2222-2229出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2011.09.007
关键词
Glasses; Infrared spectroscopy; X-ray diffraction; Electron paramagnetic resonance; Optical properties
资金
- University Grants Commission, Government of India, New Delhi [F. 37-2/2009]
Spectroscopic investigations investigations on Mn2+ doped 20ZnO + xLi(2)O + (30-x)Na2O + 50B(2)O(3) (5 <= x <= 25) (ZLNB) glasses reveal the non-linear behavior in their physical and structural properties. FT-IR spectra of ZLNB glasses reveal diborate units in the borate network. EPR spectra exhibit characteristic resonance signals of Mn2+ ions. A well resolved six line hyperfine structure around g = 2.02 corresponds to the sites of Type II, and a weak broad shoulder around g = 2.7 followed by an unresolved intense signal at g = 4.25 corresponding to sites of Type I are observed for their respective transitions. A large value of zero-field splitting parameter (D) is observed and it behaves non-linearly, reaches a maximum at x = 15 mol% with increase in Li2O content. Delta g values reveal the ionic nature of glass systems. Optical absorption spectra suggest the distorted octahedral site symmetry of Mn2+ ions in the host. Mixed alkali effect is evident in bandgap and Urbach energies. (C) 2011 Elsevier Ltd. All rights reserved.
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