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Tl2HfCl6 and Tl2ZrCl6: Intrinsic Tl-, Hf-, and Zr-based scintillators

Author:
Hawrami, R.  Ariesanti, E.  Buliga, V.  Burger, A.  Lam, S.  Motakef, S.  


Journal:
JOURNAL OF CRYSTAL GROWTH


Issue Date:
2020


Abstract(summary):

The re-discovery of Cs2HfCl6 (CHC) as a scintillator has lately generated much interest in this material and its family, which belongs to the K2PtCl6 cubic crystal structure [1]. CHC is an intrinsic scintillator that is non-hygroscopic, has no self-radioactivity, provides good energy resolution, and has good non-proportionality. In this paper we are reporting growth and scintillation properties of two new and Tl-, Hf- and Zr-based compounds of Tl2HfCl6 and Tl2ZrCl6, with physical densities of 5.1 g/cm(3) and 4.5 g/cm(3), respectively and effective atomic numbers (Z(eff)) of 71 and 69, respectively. Samples from successfully grown 16 mm diameter boules were cut, processed, and characterized for their scintillation and radiometric properties. Energy resolutions of 3.7% (FWHM) for THC and 3.4% for TZC (FWHM) at 662 keV are measured. Primary luminescence decay times of 1.1 mu s and 2.3 mu s, for Tl(2)HfC(l)6 and Tl2ZrCl6, respectively, as well as good proportionality for both materials have been observed.


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