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All sourcesNASA NTRSDOE OSTI
NASA NTRS2008

New Scintillator Materials (K2CeBr5) and (Cs2CeBr5)

Cesium cerium bromide (Cs2CeBr5) and potassium cerium bromide (K2CeBr5) are new scintillator materials for X-ray and gamma ray detector applications. Recently halide scintillator materials, such as Ce doped lanthanum bromide has been proved to be very important material for the same purpose. These materials are highly hygroscopic; a search for high light yield non-hygroscopic materials was highly desirable to advance the scintillator technology. In this paper, we are reporting the crystal growth of novel scintillator materials, cesium cerium bromide (Cs2CeBr5) and potassium cerium bromide (K2CeBr5). Crystals were successfully grown from the melt using the vertical Bridgman-Stockbarger technique, in a comparison with the high performance LaBr3 or LaCl3 crystals, cerium based alkali halides crystals, (Cs2CeBr5) and (K2CeBr5) have similar scintillation properties, while being much less hygroscopic. Furthermore, cesium based compounds will not suffer from the self-activity present in potassium and lanthanum compounds. However the Cs2CeBr5 crystals did not grow properly probably due to non-congruent melting or to some phase transition during cooling. Keywords." Scintillator materials; Ce3+; Energy resolution; Light yield; K2CeBr5

Hawrami, R.↗
DOE OSTI2020

Materials Data on K2CeBr5 by Materials Project

K2CeBr5 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. K1+ is bonded in a 8-coordinate geometry to eight Br1- atoms. There are a spread of K–Br bond distances ranging from 3.36–3.60 Å. Ce3+ is bonded to seven Br1- atoms to form distorted edge-sharing CeBr7 pentagonal bipyramids. There are a spread of Ce–Br bond distances ranging from 2.96–3.06 Å. There are four inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in a 5-coordinate geometry to four equivalent K1+ and one Ce3+ atom. In the second Br1- site, Br1- is bonded in a 4-coordinate geometry to two equivalent K1+ and two equivalent Ce3+ atoms. In the third Br1- site, Br1- is bonded to four equivalent K1+ and one Ce3+ atom to form a mixture of distorted edge, face, and corner-sharing BrK4Ce trigonal bipyramids. In the fourth Br1- site, Br1- is bonded to four equivalent K1+ and one Ce3+ atom to form a mixture of distorted edge, face, and corner-sharing BrK4Ce trigonal bipyramids.

36 MATERIALS SCIENCE↗