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CaBr is Tungsten Carbide structured and crystallizes in the hexagonal P-6m2 space group. The structure is three-dimensional. Ca is bonded in a 6-coordinate geometry to six equivalent Br atoms. All Ca–Br bond lengths are 3.13 Å. Br is bonded to six equivalent Ca atoms to form a mixture of distorted corner, edge, and face-sharing BrCa6 pentagonal pyramids.
CaBr is Boron Nitride structured and crystallizes in the hexagonal P6_3mc space group. The structure is three-dimensional. Ca is bonded in a rectangular see-saw-like geometry to four equivalent Br atoms. There are one shorter (2.96 Å) and three longer (3.01 Å) Ca–Br bond lengths. Br is bonded in a rectangular see-saw-like geometry to four equivalent Ca atoms.
National security strategies like gamma spectroscopy and high-energy X-ray radiography are limited, in part, by the scintillator used, prompting research into novel materials with improved properties. In this paper, Eu 2+ activated rubidium calcium bromide scintillators were grown via the vertical Bridgman method with a range of dopant concentrations. Light yield, energy resolution, and the afterglow of Rb 4 CaBr 6 :Eu and RbCaBr 3 :Eu improved with increasing Eu 2+ concentration, and scintillation decay time increased. The highest light yields of Rb 4 CaBr 6 :Eu and RbCaBr 3 :Eu were 71000 and 45000 ph/MeV, respectively.