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Optical absorption in gel grown barium oxalate single crystals

P. V. DALAL1,* , K. B. SARAF1, M. P. DESHPANDE2

Affiliation

  1. P. G. Department of Physics, Pratap College, Amalner -425 401
  2. Department of Physics, Sardar Patel University, Vallabh Vidyanagar -388 120, Gujarat, India

Abstract

Single crystals of barium oxalate have been grown by simple gel technique using agar gel as the growth medium at ambient temperature. The slow and controlled reaction between barium chloride and oxalic acid in agar gel has formed barium oxalate. Optical absorption spectra of this grown crystal is recorded in the wavelength region from 200 to 800 nm. The absorption spectra reveal transitions involving absorption and emission of phonons and also show that the crystal is transparent in the region 500 to 800 nm. The detail study supports the existence of forbidden indirect transition in the material. Different segment of α1/3 vs hν graph were used to distinguish individual contribution of phonons and scattering of charge carriers in the lattice is found due to acoustic phonons.

Keywords

Barium oxalate single crystal, Agar-agar gel, X-ray diffraction, Photo-absorption, Photon energ.

Citation

P. V. DALAL, K. B. SARAF, M. P. DESHPANDE, Optical absorption in gel grown barium oxalate single crystals, Optoelectronics and Advanced Materials - Rapid Communications, 4, 11, November 2010, pp.1713-1716 (2010).

Submitted at: Oct. 27, 2010

Accepted at: Nov. 10, 2010