Color change of Ruby investigated by Raman and UV-vis

POSTER

Abstract

The origin of a distinctive red color in Ruby (Al$_{2}$O$_{3}$:Cr$^{3+})$ continues to be a fundamental unsolved question [1]. We report the synthesis of a series of samples of 2{\%} Cr$_{2}$O$_{3 }$by solid state reaction [2] at temperatures varying between 900$^{o}$ and 1300$^{o}$C. We observe a visible change in color at every stage, from light green, to grey, and to pink, indicating progressive incorportation of Cr$^{3+}$ ions into the Al$_{2}$O$_{3}$ lattice. We report further investigations of x-ray diffraction analysis, Raman and UV-visible spectroscopy, and correlate the observed color changes with the evolution of vibration modes of the cage around CrO$_{6}$ and band-gap states resulting from Cr incorporation. We also plan to report results from single crystals grown using a floating zone. [1]J.M. Garcia-Lastra, M.T. Barriuso, J.A. Aramburu and M. Moreno, Phys. Rev. B 72(2005)113104 [2]L.W. Finger and R.M. Hazen, J. Appl. Phys. 49(1978)5823

Authors

  • Sean Breckling

    • University of Wisconsin-Milwaukee

  • Ying Zou

    • Physics Dept., Univ. of Wisconsin, Milwaukee, 1900 E Kenwood Blvd. Milwaukee, WI 53211, USA
    • University of Wisconsin-Milwaukee, USA
    • University of Wisconsin-Milwaukee
    • Physics Dept., Univ. of Wisconsin, 1900 E Kenwood Blvd., Milwaukee, WI 53211, USA
    • University of Wisconsin - Milwaukee, USA
    • Dept of Physics, University of Wisconsin-Milwaukee, USA

  • Shishir Ray

    • Physics Dept., Univ. of Wisconsin, Milwaukee, 1900 E Kenwood Blvd. Milwaukee, WI 53211, USA
    • University of Wisconsin-Milwaukee
    • University of Wisconsin - Milwaukee, USA

  • Larry Buroker

    • Physics Dept., Univ. of Wisconsin, Milwaukee, 1900 E Kenwood Blvd. Milwaukee, WI 53211, USA
    • Physics Dept., Univ. of Wisconsin, 1900 E Kenwood Blvd., Milwaukee, WI 53211, USA
    • University of Wisconsin-Milwaukee
    • University of Wisconsin - Milwaukee, USA

  • Somaditya Sen

    • Physics Dept., Univ. of Wisconsin, Milwaukee, 1900 E Kenwood Blvd. Milwaukee, WI 53211, USA
    • University of Wisconsin-Milwaukee
    • Physics Dept., Univ. of Wisconsin, 1900 E Kenwood Blvd., Milwaukee, WI 53211, USA
    • University of Wisconsin - Milwaukee, USA

  • Mark Williamsen

    • Physics Dept., Univ. of Wisconsin, Milwaukee, 1900 E Kenwood Blvd. Milwaukee, WI 53211, USA
    • University of Wisconsin-Milwaukee
    • Physics Dept., Univ. of Wisconsin, 1900 E Kenwood Blvd., Milwaukee, WI 53211, USA
    • University of Wisconsin - Milwaukee, USA

  • Prasenjit Guptasarma

    • Physics Dept., Univ. of Wisconsin, Milwaukee, 1900 E Kenwood Blvd. Milwaukee, WI 53211, USA
    • University of Wisconsin-Milwaukee, USA
    • University of Wisconsin-Milwaukee
    • Physics Dept., Univ. of Wisconsin, 1900 E Kenwood Blvd., Milwaukee, WI 53211, USA
    • University of Wisconsin - Milwaukee, USA
    • Dept of Physics, University of Wisconsin-Milwaukee, USA