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Refractive index dispersion of spinel Zn2TiO4 single crystal

✍ Scribed by Liang Li; Ya Fan; Dejun Wang; Guanlin Feng; Dapeng Xu

Publisher
John Wiley and Sons
Year
2011
Tongue
English
Weight
225 KB
Volume
46
Category
Article
ISSN
0232-1300

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✦ Synopsis

Zn 2 TiO 4 , single crystal, refractive index, dielectric constant, dispersion equations.

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 Ξ± 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 singleeffective 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.

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