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Title: Metamagnetic transition in EuSe{sub 2}: A new, metastable binary rare-earth polychalcogenide

Abstract

The reaction of Eu with molten lithium polyselenide produced a new rare-earth dichalcogenide, EuSe{sub 2}. This compound cannot be obtained via direct combination of the elements and is therefore an example of how alkali metal chalcogenide fluxes can access metastable or kinetically stable phases. The crystals of EuSe{sub 2} are very dark red and air stable for several months. The structure was determined with single-crystal X-ray diffraction. The compound crystallizes in the tetragonal space group, I4/mcm ({number_sign} 140) with a = 6.391(1) {angstrom} and c = 7.848(1) {angstrom}, Z = 4, R1 = 3.9%, and wR2 = 10.0%. It adopts the CuAl{sub 2} structure type, and contains rows of staggered diselenide dumbbells running parallel to the c-axis, separated by rows of square antiprismatically coordinated Eu atoms. EuSe{sub 2} is a semiconductor with a band gap of 1.43 eV and decomposes at 569 C to the more stable cubic EuSe. EuSe{sub 2} displays metamagnetic behavior below 8 K. Variable temperature magnetic susceptibility and magnetization measurements were performed on single-crystal samples to study this phenomenon. A model is proposed in which all Eu spins in the ab-plane are coupled ferromagnetically, whereas alternate sheets are coupled antiferromagnetically to form bulk antiferromagnet. The Se-Semore » bond stretch exhibits a Raman shift of 256 cm{sup {minus}1}.« less

Authors:
; ;  [1]
  1. Michigan State Univ., East Lansing, MI (United States)
Publication Date:
OSTI Identifier:
328233
Resource Type:
Journal Article
Journal Name:
Chemistry of Materials
Additional Journal Information:
Journal Volume: 10; Journal Issue: 12; Other Information: PBD: Dec 1998
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CRYSTAL STRUCTURE; MAGNETIC PROPERTIES; EUROPIUM SELENIDES; CHALCOGENIDES; X-RAY DIFFRACTION; LATTICE PARAMETERS; ANTIFERROMAGNETISM

Citation Formats

Aitken, J A, Cowen, J A, and Kanatzidis, M G. Metamagnetic transition in EuSe{sub 2}: A new, metastable binary rare-earth polychalcogenide. United States: N. p., 1998. Web. doi:10.1021/cm980364e.
Aitken, J A, Cowen, J A, & Kanatzidis, M G. Metamagnetic transition in EuSe{sub 2}: A new, metastable binary rare-earth polychalcogenide. United States. https://doi.org/10.1021/cm980364e
Aitken, J A, Cowen, J A, and Kanatzidis, M G. Tue . "Metamagnetic transition in EuSe{sub 2}: A new, metastable binary rare-earth polychalcogenide". United States. https://doi.org/10.1021/cm980364e.
@article{osti_328233,
title = {Metamagnetic transition in EuSe{sub 2}: A new, metastable binary rare-earth polychalcogenide},
author = {Aitken, J A and Cowen, J A and Kanatzidis, M G},
abstractNote = {The reaction of Eu with molten lithium polyselenide produced a new rare-earth dichalcogenide, EuSe{sub 2}. This compound cannot be obtained via direct combination of the elements and is therefore an example of how alkali metal chalcogenide fluxes can access metastable or kinetically stable phases. The crystals of EuSe{sub 2} are very dark red and air stable for several months. The structure was determined with single-crystal X-ray diffraction. The compound crystallizes in the tetragonal space group, I4/mcm ({number_sign} 140) with a = 6.391(1) {angstrom} and c = 7.848(1) {angstrom}, Z = 4, R1 = 3.9%, and wR2 = 10.0%. It adopts the CuAl{sub 2} structure type, and contains rows of staggered diselenide dumbbells running parallel to the c-axis, separated by rows of square antiprismatically coordinated Eu atoms. EuSe{sub 2} is a semiconductor with a band gap of 1.43 eV and decomposes at 569 C to the more stable cubic EuSe. EuSe{sub 2} displays metamagnetic behavior below 8 K. Variable temperature magnetic susceptibility and magnetization measurements were performed on single-crystal samples to study this phenomenon. A model is proposed in which all Eu spins in the ab-plane are coupled ferromagnetically, whereas alternate sheets are coupled antiferromagnetically to form bulk antiferromagnet. The Se-Se bond stretch exhibits a Raman shift of 256 cm{sup {minus}1}.},
doi = {10.1021/cm980364e},
url = {https://www.osti.gov/biblio/328233}, journal = {Chemistry of Materials},
number = 12,
volume = 10,
place = {United States},
year = {1998},
month = {12}
}