Determination of thermal expansion of KCal₃ using in-situ high temperature powder X-ray diffraction

Lindsey, Adam C, Loyd, Matthew, Patel, Maulik K ORCID: 0000-0002-3214-5752, Rawl, Ryan, Zhou, Haidong, Koschan, Merry, Melcher, Charles L and Zhuravleva, Mariya (2018) Determination of thermal expansion of KCal₃ using in-situ high temperature powder X-ray diffraction. MATERIALS CHEMISTRY AND PHYSICS, 212. pp. 161-166.

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Abstract

KCaI3:Eu single crystals exhibit favorable scintillation properties and have potential for use in domestic security applications requiring radioisotope identification. The anisotropic thermal expansion of the orthorhombic unit cell of this perovskite-type scintillator has been investigated using in-situ high temperature X-ray diffraction on powdered samples. Samples from single crystals of both pure and Eu-doped KCaI3 grown by the Bridgman method were used for comparison. Expansion with temperature along the b-axis is greatest with an average linear coefficient of thermal expansion of ≈ (41–46) x 10−6 K−1 resulting from the weaker bonding between alternating layers of K and Ca parallel to the b-axis. Thermal expansion in each of the KCaI3 samples has the highest degree of anisotropy with respect to the b and c axis with ratio ᾱb/ᾱc of 1.4–1.5. Additionally, we identify the predominant cleavage plane in KCaI3 as (0 -3 -1) based upon Laue reflection imaging.

Item Type:	Article
Uncontrolled Keywords:	X-ray diffraction, Bridgman technique, Halides, Scintillator materials
Depositing User:	Symplectic Admin
Date Deposited:	07 Mar 2018 07:21
Last Modified:	12 Oct 2023 17:55
DOI:	10.1016/j.matchemphys.2018.03.016
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3018699