Crystal structure and thermal expansion of CsCaI<sub>3</sub>:Eu and CsSrBr<sub>3</sub>:Eu scintillators



Loyd, Matthew, Lindsey, Adam, Patel, Maulik ORCID: 0000-0002-3214-5752, Koschan, Merry, Melcher, Charles L and Zhuravleva, Mariya
(2018) Crystal structure and thermal expansion of CsCaI<sub>3</sub>:Eu and CsSrBr<sub>3</sub>:Eu scintillators. JOURNAL OF CRYSTAL GROWTH, 481. pp. 35-39.

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Abstract

The distorted-perovskite scintillator materials CsCaI3:Eu and CsSrBr3:Eu prepared as single crystals have shown promising potential for use in radiation detection applications requiring a high light yield and excellent energy resolution. We present a study using high temperature powder X-ray diffraction experiments to examine a deleterious high temperature phase transition. High temperature phases were identified through sequential diffraction pattern Rietveld refinement in GSAS II. We report the linear coefficients of thermal expansion for both high and low temperature phases of each compound. Thermal expansion for both compositions is greatest in the [0 0 1] direction. As a result, Bridgman growth utilizing a seed oriented with the [0 0 1] along the growth direction should be used to mitigate thermal stress.

Item Type: Article
Uncontrolled Keywords: X-ray diffraction, Bridgman technique, Halides, Scintillator materials
Depositing User: Symplectic Admin
Date Deposited: 13 Nov 2017 08:11
Last Modified: 12 Oct 2023 17:55
DOI: 10.1016/j.jcrysgro.2017.10.031
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3011384