Orientation effects on the bandgap and dispersion behavior of 0.91Pb(Zn1/3Nb2/3)O3–0.09PbTiO3 single crystals

doi:10.1088/1674-1056/21/5/054207

Abstract 0.91Pb(Zn_1/3Nb_2/3)O₃--0.09PbTiO₃ (PZN--9%PT) single crystals with different orientations are investigated by using a spectroscopic ellipsometer, and the refractive indices and the extinction coefficients are obtained. The Sellmeier dispersion equations for the refractive indices are obtained by the least square fitting, which can be used to calculate the refractive indices in a low absorption wavelength range. Average Sellmeier oscillator parameters E_o, $\lambda$_o, S_o, and E_d are calculated by fitting with the single-term oscillator equation, which are related directly to the electronic energy band structure. The optical energy bandgaps are obtained from the absorption coefficient spectra. Our results show that the optical properties of [001] and [111] poled crystals are very similar, but quite different from those of the [011] poled crystal.

Keywords: dispersion bandgap orientation

Received: 21 July 2011
Revised: 27 April 2012
Accepted manuscript online:

PACS:	42.50.Ct	(Quantum description of interaction of light and matter; related experiments)
	78.20.Ci	(Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))
	78.20.-e	(Optical properties of bulk materials and thin films)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 60808026, 11174147, 50872053, 50902027 and 11004103), the Specialized Research Fund for the Doctoral Program of Higher Education, China (Grant No. 20093218120030), the Nanjing University of Aeronautics and Astronautics Research Funding, China (Grant No. NP2011037), the Program for New Century Excellent Talents in University, China (Grant No. NCET-10-0070), the Prior Project in Key Science & Technology Program of Zhejiang Province, China (Grant No. 2009C11144), and the Cultivation Fund of the Key Scientific and Technical Innovation Project of Ministry of Education of China (Grant No. 707031).

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He Chong-Jun(赫崇君), Fu Xin-Duo(付信夺), Xu Feng(徐峰), Wang Ji-Ming(王吉明), Zhu Kong-Jun(朱孔军), Du Chao-Ling(杜朝玲), and Liu You-Wen(刘友文) Orientation effects on the bandgap and dispersion behavior of 0.91Pb(Zn_1/3Nb_2/3)O₃–0.09PbTiO₃ single crystals 2012 Chin. Phys. B 21 054207

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Orientation effects on the bandgap and dispersion behavior of 0.91Pb(Zn1/3Nb2/3)O3–0.09PbTiO3 single crystals

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Orientation effects on the bandgap and dispersion behavior of 0.91Pb(Zn_1/3Nb_2/3)O₃–0.09PbTiO₃ single crystals