The Study Of 1,3,5-triphenylbenzene Crystal Growths By Temperature Reduction Method And Its Characterizations

In this paper,1,3,5-triphenylbenzene (3-PB) crystals which grown from different organic solvents were systematically studied. The reasons for the formation of defects in the crystal were analyzed. Bulk crystals we grained are available for application. Main research contents as follows:(1) By comparing the crystallization situation of various solvents, the p-xylene, acetone and toluene were selected to grow 3-PB crystals of complete crystal shaping and fewer defections as well.3-PB crystal solutes of higher purity were obtained by recrystallization from raw material.(2) The solubility curves of 3-PB in p-xylene, acetone and toluene solvents were determined respectively.3-PB crystals were grown from these solvents by solution cooling method. Some bulk transparent crystals were obtained through growth parameters improvement and exercised for pulse shape discrimination (PSD) test.(3) Defects such as inclusions, dislocations, grain patterns of crystals were observed by chemical etching and optical microscopic observation. The reasons for formation of defects and methods to reduce defects in crystal were discussed.(4) 3-PB crystals obtained in different solvents were characterized by small molecule diffraction, comprehensive thermal analysis, photoluminescence spectrum, pulse shape discrimination (PSD) respectively. The results show that the solvents have fewer effects on the thermal and n/y discrimination performance of crystals; also the crystals have good fluorescence properties and excellent n/y ray discrimination abilities for high energy neutron detection.