ESR, infrared and optical absorption studies of Cu²⁺ ion doped in 60B₂O₃-10TeO₂-(30-<i style="">x</i>)MO-<i style="">x</i>PbO (M = Zn, Cd) glasses

Abstract

<smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="PlaceName" downloadurl="http://www.5iantlavalamp.com/"><smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="PlaceType" downloadurl="http://www.5iantlavalamp.com/"><smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="place" downloadurl="http://www.5iantlavalamp.com/"> ESR, IR and optical absorption studies on 60B₂O₃-10TeO₂-(30-<i style="">x</i>)MO-<i style="">x</i>PbO (where M=Zn, Cd) glasses containing Cu²⁺ spin probe have been carried out. The IR results prove the distribution of trigonal bipyramids (TeO₃) which determines the network and the distribution of borate triangles (BO₃) and borate tetrahedral (BO₄) groups. Structural changes take place with variation of PbO content in BTZP and BTCP series. ESR results show that the <i style="">g</i>_{|| >} <i style="">g</i>_⊥ indicating that the Cu²⁺ ion is in tetragonal distorted octahedral site and its ground state is <b></b>_{<img src='/image/spc_char/dxy.gif'>.} There are considerable changes in <i style="">g_||</i>_, <i style="">g</i>_⊥and <i style="">A</i>_||values with the increasing concentration of PbO in both BTZP and BTCP glass systems. The optical absorption spectra results show that the absorption peak of Cu²⁺ is a function of composition. The observed optical absorption peak of Cu²⁺ has been found to be maximum at 813 nm for <i style="">x</i>=30 mol% of PbO content. Bonding parameters are calculated from both optical and ESR data. All these variations clearly indicate the structural changes in the present glass systems with varying PbO content. </smarttagtype></smarttagtype></smarttagtype>