La3+ Distribution and Annealing Effects in La:PbWO4 Crystal

Autor: Yanxing Zhang, Guanqin Hu, Baoguo Han, Ning Lei, Zhiwen Yin, Xiqi Feng
Rok vydání: 1998
Předmět:
Zdroj: physica status solidi (a). 170:37-45
ISSN: 1521-396X
0031-8965
Popis: The optical transmission spectra and irradiation induced absorption spectra were measured transversely point by point from the top to the bottom of La : PbWO 4 crystal. From the experimental results, it can be clearly seen that La 3+ ions distribute inhomogeneously in the crystal, and have pronounced effect on suppressing its intrinsic absorption band at 350 nm. Therefore, the correlation between the transmission at 350 nm and the La 3- distribution concentration was reasonably discussed. Furthermore, high temperature annealing of the crystal in air can also influence its transmission spectra, and how this affects the formation of induced color centers being studied. The annealing temperatures taken are 600, 780, and 960°C, respectively, and when annealed at 960 C, La 3+ diffusion in the crystal may occur, and thus induced color centers may decrease. Finally. it can he concluded that suitable La doping and annealing at appropriate temperatures can improve the radiation hardness of PWO crystal significantly.
Databáze: OpenAIRE
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