Crystal structure and thermal expansion of CsCaI3:Eu and CsSrBr3:Eu scintillators

Matthew Loyd; Adam Lindsey; Maulik Patel; Merry Koschan; Charles L. Melcher; Mariya Zhuravleva

doi:10.1016/j.jcrysgro.2017.10.031

Crystal structure and thermal expansion of CsCaI₃:Eu and CsSrBr₃:Eu scintillators

Matthew Loyd, Adam Lindsey, Maulik Patel, Merry Koschan, Charles L. Melcher, Mariya Zhuravleva

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

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.

Original language	English
Pages (from-to)	35-39
Number of pages	5
Journal	Journal of Crystal Growth
Volume	481
DOIs	https://doi.org/10.1016/j.jcrysgro.2017.10.031
State	Published - Jan 1 2018
Externally published	Yes

Funding

This work has been supported by the US Department of Homeland Security, Domestic Nuclear Detection Office , under competitively awarded grant #2012-DN-077-ARI067-05 . This support does not constitute an express or implied endorsement on the part of the Government. The X-ray diffraction experiments were performed using the instruments procured through the general infrastructure grant of DOE-Nuclear Energy University Program #DE-NE0000693 .

Funders	Funder number
U.S. Department of Homeland Security
Domestic Nuclear Detection Office	2012-DN-077-ARI067-05

Keywords

A1. X-ray diffraction
B1. Halides
B2. Bridgman technique
B2. Scintillator materials

Access to Document

10.1016/j.jcrysgro.2017.10.031

Cite this

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title = "Crystal structure and thermal expansion of CsCaI3:Eu and CsSrBr3:Eu scintillators",

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.",

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AU - Loyd, Matthew

AU - Lindsey, Adam

AU - Patel, Maulik

AU - Koschan, Merry

AU - Melcher, Charles L.

AU - Zhuravleva, Mariya

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AB - 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.

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