Journal of Materials Science

, Volume 25, Issue 5, pp 2585–2589 | Cite as

Different effects of nickel and cobalt additions on the electronic conduction of copper tellurite glasses

  • M. Suleman Malik
  • C. A. Hogarth
Article

Abstract

Measurements of the d.c. electrical conductivity were made on 65TeO2-(35-x)CuO-x(MO) (mol %) glasses wherex=0, 0.5, 1, 2, 3, 4 and M represents nickel or cobalt. A variation in the conductivity and activation energy of the glasses is observed as CuO is replaced by NiO and by CoO. It is found that withx=0.5 to 3 mol % of NiO, the conductivity increases and the activation energy decreases due to the decrease in effective electron hopping distance between the transition metal (TM) ions. The conductivity is found to decrease with the substitution of 4 mol % of NiO and 0.5 to 4 mol % of CoO and this is attributed to the decrease in relative concentration of hopping centres because of the decrease in the hopping transitions between ions of the same element (e.g. Cu+ and Cu2+ ions) and between the ions of different TM elements (e.g. Cu+ and Ni2+, Cu+ and Co2+). This decrease in conductivity has also been described due to the formation of Ni-O-Ni, Cu-O-Ni and Co-O-Co, Cu-O-Co bridge bonds in NiO-and CoO-doped glasses respectively. The CoO-doped glasses have been found to be of a more insulating nature.

Keywords

Polymer Copper Nickel Activation Energy Cobalt 

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Copyright information

© Chapman and Hall Ltd. 1990

Authors and Affiliations

  • M. Suleman Malik
    • 1
  • C. A. Hogarth
    • 1
  1. 1.Department of PhysicsBrunel UniversityUxbridgeUK

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