XPS STUDY OF DOPING MECHANISM IN HEAVILY DOPEDPbWO4:M3+(M=La,Nd,Gd)CRYSTALS

Xiqi Feng, Weifeng Li and Wenliang Zhu
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Xiqi Feng: The State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. China
Weifeng Li: The State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. China
Wenliang Zhu: The State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. China

Surface Review and Letters (SRL), 2007, vol. 14, issue 04, 725-728

Abstract: Lead tungstate (PbWO4) (PWO) crystals doped with high concentration trivalent rare earth ions have demonstrated to be a promising Cherenkov radiator material and also a potential material for optoelectronic application. In this paper, the doping mechanisms of the trivalent ions (La3+,Nd3+, andGd3+) in the PWO host were studied using X-ray photoelectron spectroscopy (XPS), and the results were consistent with those of computer simulation. It was found that when heavily doped,La3+may substitute for theWsites as well as thePbsites for self-compensation by formingLadimers or small aggregates. However, the doping mechanism of heavily doped PWO:Nd3+and PWO:Gd3+might be different from that of heavily doped PWO:La3+crystals.

Keywords: PbWO4crystal; doping mechanism; XPS (search for similar items in EconPapers)
Date: 2007
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DOI: 10.1142/S0218625X07010007

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