• DOI:10.1039/c5cp00906e
• Corpus ID: 22418420

Dielectric and Raman investigations of structural phase transitions in (C2H5NH3)2CdCl4.

@article{Yadav2015DielectricAR,
  title={Dielectric and Raman investigations of structural phase transitions in (C2H5NH3)2CdCl4.},
  author={Ruchika Yadav and Diptikanta Swain and Partha Pratim Kundu and Harikrishnan S Nair and Chandrabhas Narayana and Suja Elizabeth},
  journal={Physical chemistry chemical physics : PCCP},
  year={2015},
  volume={17 18},
  pages={
          12207-14
        }
}

• R. Yadav, Diptikanta Swain, +3 authors S. Elizabeth
• Published 29 April 2015
• Chemistry, Physics
• Physical chemistry chemical physics : PCCP

Temperature-dependent Raman and dielectric measurements have been carried out on (C2H5NH3)2CdCl4 single crystals. Raman studies reveal the presence of two structural phase transitions below room temperature at 216 K and 114 K. The phase transitions are marked by anomalies in temperature dependence of wave-number and full width half maximum (FWHM) of several vibrational modes. The transitions are also accompanied by anomalies in dielectric measurements. Raman and dielectric data indicate that the transition at 216 K is order-disorder in nature and is driven by re-orientation of organic ions, while the transition at 114 K is due to coupling between the CdCl6 octahedron and the organic chain. Further high temperature dielectric measurements reveal the presence of one more structural phase transition around 473 K across which dispersion in dielectric parameters is observed. The activation energies and relaxation time obtained for high temperature dielectric phases are characteristic of combined reorientation motions of alkyl ammonium cations.