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    • Electrical, thermal and infrared studies of cadmium metavanadate

      N Suresh Rao O G Palanna

      Papers Presented At The Materials Science Section Of The 82nd Indian Science Congress, Calcutta, 1995 Volume 19 Issue 6 December 1996 pp 1073-1080

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      https://www.ias.ac.in/article/fulltext/boms/019/06/1073-1080

    • Keywords

       

      Crystal structure; semiconductor; stoichiometric; phase transition

    • Abstract

       

      Cadmium(II) metavanadate has crystal structure related to brannerite (ThTi2O6) structure. The high temperatureβ-CdV2O6 phase isn-type semiconductor between 185 and 750°C. The electrical conduction in theβ-CdV2O6 occurs due to deviation from oxygen stoichiometric composition of the lattice. The seebeck coefficient (α) of the sample is negative and constant in the entire range of investigation. The mechanism of transport in cadmium metavanadate lattice is via thermally activated hopping of localized electrons on vanadium (V5+) sites of the lattice. The DTA result indicated that CdV2O6 undergoes phase transition at 185°C and not at 670°C as reported earlier. There is no DTA evidence to show the possibility ofβ →α phase reverse transition. The XRD powder patterns of the two modifications are nearly similar indicating brannerite related structures. The infrared absorption band of vanadium-oxygen stretching vibration modes of distorted VO6 octahedra ofβ-CdV2O6 is exhibited at 855 cm−1.

    • Author Affiliations

       

      N Suresh Rao1 O G Palanna1

      1. Department of Chemistry, St Philomena College, Puttur - 574 202, India

    • Dates

       
      Published
      December 1996
      Manuscript received
      2 April 1996
      Manuscript revised
      30 August 1996

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