Determination of thermal expansion of KCaI3 using in-situ high temperature powder X-ray diffraction

Adam C. Lindsey; Matthew Loyd; Maulik K. Patel; Ryan Rawl; Haidong Zhou; Merry Koschan; Charles L. Melcher; Mariya Zhuravleva

doi:10.1016/j.matchemphys.2018.03.016

Determination of thermal expansion of KCaI₃ using in-situ high temperature powder X-ray diffraction

Adam C. Lindsey, Matthew Loyd, Maulik K. Patel, Ryan Rawl, Haidong Zhou, Merry Koschan, Charles L. Melcher, Mariya Zhuravleva

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

5 Scopus citations

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 ᾱ_b/ᾱ_c of 1.4–1.5. Additionally, we identify the predominant cleavage plane in KCaI₃ as (0 -3 -1) based upon Laue reflection imaging.

Original language	English
Pages (from-to)	161-166
Number of pages	6
Journal	Materials Chemistry and Physics
Volume	212
DOIs	https://doi.org/10.1016/j.matchemphys.2018.03.016
State	Published - Jun 15 2018
Externally published	Yes

Funding

This work has been supported by the U.S. 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. Dr. Haidong Zhou thanks the support from award #NSF-DMR-1350002. 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	DMR-1350002, 2012-DN-077-ARI067-05

Keywords

Bridgman technique
Halides
Scintillator materials
X-ray diffraction

Access to Document

10.1016/j.matchemphys.2018.03.016

Cite this

@article{96ae0029beb44d9bbbe1e12a1f8986ed,

title = "Determination of thermal expansion of KCaI3 using in-situ high temperature powder X-ray diffraction",

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.",

keywords = "Bridgman technique, Halides, Scintillator materials, X-ray diffraction",

author = "Lindsey, {Adam C.} and Matthew Loyd and Patel, {Maulik K.} and Ryan Rawl and Haidong Zhou and Merry Koschan and Melcher, {Charles L.} and Mariya Zhuravleva",

note = "Publisher Copyright: {\textcopyright} 2018 Elsevier B.V.",

year = "2018",

month = jun,

day = "15",

doi = "10.1016/j.matchemphys.2018.03.016",

language = "English",

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AU - Lindsey, Adam C.

AU - Loyd, Matthew

AU - Patel, Maulik K.

AU - Rawl, Ryan

AU - Zhou, Haidong

AU - Koschan, Merry

AU - Melcher, Charles L.

AU - Zhuravleva, Mariya

PY - 2018/6/15

Y1 - 2018/6/15

N2 - 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.

AB - 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.

KW - Bridgman technique

KW - Halides

KW - Scintillator materials

KW - X-ray diffraction

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