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    • Optical and X-ray photoelectron spectroscopy of PbGeO3 and Pb5Ge3O11 single crystals

      S C Sabharwal S N Jha Sangeeta

      Optical Properties Volume 33 Issue 4 August 2010 pp 395-400

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      https://www.ias.ac.in/article/fulltext/boms/033/04/0395-0400

    • Keywords

       

      Czochralski technique; PbGeO3 and Pb5Ge3O11 single crystals; optical absorption; XPS; gamma irradiation.

    • Abstract

       

      Pb5Ge3O11 crystals are found to exhibit pale yellow colouration while PbGeO3 are colourless. X-ray photoelectron spectroscopy (XPS) measurements show lead deficiency in both the crystals. The results also reveal a stronger ionic character for PbGeO3 as compared to Pb5Ge3O11 crystal. The binding energy of Ge3𝑑 core level in the case of Pb5Ge3O11 crystal is found to be smaller than the binding energy of germanium oxide, thereby indicating the incomplete oxidation of Ge ions in the crystal lattice. On gamma ray irradiation, the transmission of both the crystals is observed to deteriorate uniformly over the entire wavelength range, which has been attributed to the oxidation of some of the lattice Pb ions. On gamma irradiation the changes observed in O1𝑠 core level energies for both the crystals are seen to be consistent with the changes noted in the Pb4𝑓7/2 and Ge3𝑑 spectra. Interestingly, the results reveal oxidation of surface Ge atoms with atmospheric oxygen under gamma irradiation.

    • Author Affiliations

       

      S C Sabharwal1 S N Jha1 Sangeeta2

      1. Spectroscopy Division and TPPED, Bhabha Atomic Research Centre, Mumbai 400 085, India
      2. Crystal Technology Laboratory, TPPED, Bhabha Atomic Research Centre, Mumbai 400 085, India

    • Dates

       
      Published
      August 2010
      Manuscript received
      3 March 2009

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