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Dispersion of the birefringence in (CH12H25NH3)2ZnCl4 and (C12H25NH3)2ZnCl4: Co around their isotropic points |
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| Authors: | J. Etxebarria C. Socías J. Herreros M. A. Arriandiaga J. Fernández |
| Affiliation: | 1. Departamento de Fisica de la Materia Condensada, Facultad de Ciencias , Universidad del Pais Vasco , Apartado 644, 48080 , Bilbao , Spain;2. Departamento de Fisica Aplicada II, Facultad de Ciencias , Universidad del Pais Vasco , Apartado 644, 48080 , Bilbao , Spain;3. Departamento de Física Aplicada I , Escuela Técnica Superior de Ingenieros Industrials y de Telecomunicación, Universidad del País Vasco , 48013, Bilbao , Spain |
| Abstract: | The optical dispersion of (C12H25NH3)2ZnCl4 and (C12H25NH3)2ZnCl4: Co is investigated by means of birefringence and optical absorption measurements in the temperature region around their isotropic points. The birefringence dispersion is analyzed in terms of a simple oscillator model based on the absorption band structure of both materials. A fairly good agreement is found between the thermal behaviour of the adjustable parameters of the oscillator model and the temperature dependence of the absorption spectra. The results suggest the existence of a structural phase transition at 315 K. |
| Keywords: | Birefringence dispersion optical absorption layered perovskites |