Czochralski Growth and Scintillation Properties of Cerium-doped Li6Gd(BO3)3 Crystals

doi:10.3724/SP.J.1077.2006.01053

Abstract

Abstract:

Cerium-doped lithium gadolinium borate (Li₆Gd(BO₃)₃:Ce) single crystals up to 25mm in diameter and 40mm in length were grown by the Czochralski method using inductively heated platinum crucibles. The as-grown Li₆Gd(BO₃)₃:Ce crystals are of single-phase and they belong to the monoclinic system with space group of P2₁/c. Problems existing in crystal growth such as cleavage crack, stress crack and polycrystalline were discussed. The appearance of the perfect cleavage plane (020) was explained by considering the structure of Li₆Gd(BO₃)₃. The results show that optical transmittance in the range of 380~800nm is near 90%. The absorption from 200nm to 380nm can be related to 4f-5d transitions of Ce³⁺ ions and 4f-4f transitions of Gd³⁺ ions. Both the mission under the optical excitation and the emission under X-ray excitation display the typical double-peaks characteristic of Ce³⁺ ions. Compared with the emission under the optical excitation, the emission under X-ray excitation shows a slight ‘red shit’. Decay time spectrum from Li₆Gd(BO₃)₃:Ce can be well fitted with a decay time of 30.74ns. The energy resolution under the excitation of α-ray from ²⁴¹Am measured is 28.84%.

Key words: lithium gadolinium borate, crystal growth, optical transmittance, scintillation properties

CLC Number:

O782

CHEN Jun-Feng,LI Yun,SONG Gui-Lan,YAO Dong-Min,YUAN Lan-Ying,QI Xue-Jun,WANG Shao-Hua. Czochralski Growth and Scintillation Properties of Cerium-doped Li₆Gd(BO₃)₃ Crystals[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2006.01053.

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Czochralski Growth and Scintillation Properties of Cerium-doped Li₆Gd(BO₃)₃ Crystals

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