Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7921695 | Materials Chemistry and Physics | 2018 | 14 Pages |
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 â (41-46) x 10â6â¯Kâ1 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 á¾±b/á¾±c of 1.4-1.5. Additionally, we identify the predominant cleavage plane in KCaI3 as (0 -3 -1) based upon Laue reflection imaging.
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
Adam C. Lindsey, Matthew Loyd, Maulik K. Patel, Ryan Rawl, Haidong Zhou, Merry Koschan, Charles L. Melcher, Mariya Zhuravleva,