Optical properties of pyrochlore lead scandium tantalate crystals

被引:0
作者
Marinova, V
Petrova, D
Veleva, M
机构
[1] Bulgarian Acad Sci, Cent Lab Opt Storage & Proc Informat, BU-1113 Sofia, Bulgaria
[2] Univ Blagoevgrad, Phys Dept N Rilsky, Blagoevgrad 2700, Bulgaria
[3] Bulgarian Acad Sci, Inst Solid State Phys, BU-1784 Sofia, Bulgaria
关键词
D O I
10.1002/(SICI)1521-4079(1998)33:1<119::AID-CRAT119>3.0.CO;2-8
中图分类号
O7 [晶体学];
学科分类号
0702 ; 070205 ; 0703 ; 080501 ;
摘要
Optically homogeneous Pb2Sc0.5Ta1.5O6.5 crystals with pyrochlore structure are prepared by the method of high-temperature solution growth (HTSG). The refractive index in the visible region of the spectrum is measured. From the transmission spectra in the visible and infrared region the optical transmission window is estimated. From the fundamental absorption edge in the visible region of the spectrum the optical bandgap is determined corresponding to the intrinsic absorption. From the behaviour of the absorption coefficient alpha(hv) and alpha(1/2)(hv) and the Raman spectrum permit to suggest that the absorption edge below 2.75 eV is due to indirect transitions.
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页码:119 / 124
页数:6
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