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Refractive index dispersion of spinel Zn 2 TiO 4 single crystal
Author(s) -
Li Liang,
Fan Ya,
Wang Dejun,
Feng Guanlin,
Xu Dapeng
Publication year - 2011
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.201100068
Subject(s) - refractive index , dispersion (optics) , crystal (programming language) , dielectric , analytical chemistry (journal) , molar absorptivity , single crystal , transmittance , absorption spectroscopy , chemistry , materials science , optics , attenuation coefficient , crystallography , physics , optoelectronics , chromatography , computer science , programming language
The transmittance and absorption spectra of a high‐quality Zn 2 TiO 4 single crystal have been measured along the a ‐axes at room‐temperature in the range of 200‐1000 nm. The wavelength dependent refractive index, extinction coefficient, real and imaginary parts of the complex dielectric constant of the Zn 2 TiO 4 crystal have been derived from the measured T and α spectra. By fitting the refractive index spectrum, the Sellmeier dispersion equation of the Zn 2 TiO 4 crystal has been obtained. The validity of Cauchy‐Sellmeier equation has been evaluated in the energy range of 2.90–3.20 eV representing the Urbach tail. Applying the single‐effective oscillator model, the dispersion energy E d and the oscillator energy E 0 have been determined as 18.76 and 5.05 eV, respectively. The obtained dispersion energy E d takes on ionic crystal value. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)