skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Flux growth and magnetic properties of rare earth cobalt germanide, RE{sub 6}Co{sub 5}Ge{sub 1+x}Al{sub 3−x} (RE=Pr, Nd; x≈0.8)

Abstract

The intermetallic compounds RE{sub 6}Co{sub 5}Ge{sub 1+x}Al{sub 3−x} (RE=Pr{sub ,} Nd) were synthesized from the reaction of germanium and aluminum in RE/Co eutectic flux. These phases crystallize with the Nd{sub 6}Co{sub 5}Ge{sub 2.2} structure type in hexagonal space group P-6m2 (a=9.203(2)Å, c=4.202(1) Å, R{sub 1}=0.0109 for Pr{sub 6}Co{sub 5}Ge{sub 1.80}Al{sub 2.20}; and a=9.170(3) Å, c=4.195(1) Å, R{sub 1}=0.0129 for Nd{sub 6}Co{sub 5}Ge{sub 1.74}Al{sub 2.26}). The structure features chains of face-sharing Ge@RE{sub 9} clusters intersecting hexagonal cobalt nets linked by aluminum atoms. Magnetic susceptibility measurements indicate that both phases exhibit ferromagnetic ordering of the cobalt layers with T{sub C} in the range of 130–140 K. The magnetic moments of the rare earth ions order at lower temperature (30–40 K). Magnetic measurements on oriented crystals of Nd{sub 6}Co{sub 5}Ge{sub 1.74}Al{sub 2.26} show a strong preference of the moments to order along the c-axis. - Graphical abstract: RE{sub 6}Co{sub 5}Ge{sub 1+x}Al{sub 3−x} (RE=Pr{sub ,} Nd) were grown as large crystals from reactions of Ge and Al in RE/Co eutectic melts. Magnetic measurements indicate ordering of the 2-D cobalt nets at 130–140 K, and ordering of the rare earth moments at 30–40 K. Display Omitted - Highlights: • RE{sub 6}Co{sub 5}Ge{sub 1+x}Al{sub 3−x} (RE=Pr{submore » ,} Nd) grown as large crystals from RE/Co eutectic flux. • RE{sub 6}Co{sub 5}Ge{sub 1+x}Al{sub 3−x} structure features hexagonal cobalt nets stacked along c-axis. • Cobalt layers order ferromagnetically with T{sub c}=130–140 K. • Rare earth magnetic moments order at low temperature (30–40 K).« less

Authors:
;
Publication Date:
OSTI Identifier:
22584119
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 238; Other Information: Copyright (c) 2016 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ALUMINIUM; ANISOTROPY; COBALT; CRYSTAL GROWTH; CRYSTALS; EUTECTICS; GERMANIDES; GERMANIUM; INTERMETALLIC COMPOUNDS; MAGNETIC MOMENTS; MAGNETIC SUSCEPTIBILITY; RARE EARTHS; SPACE GROUPS

Citation Formats

Zhou, Sixuan, and Latturner, Susan E., E-mail: latturner@chem.fsu.edu. Flux growth and magnetic properties of rare earth cobalt germanide, RE{sub 6}Co{sub 5}Ge{sub 1+x}Al{sub 3−x} (RE=Pr, Nd; x≈0.8). United States: N. p., 2016. Web. doi:10.1016/J.JSSC.2016.03.024.
Zhou, Sixuan, & Latturner, Susan E., E-mail: latturner@chem.fsu.edu. Flux growth and magnetic properties of rare earth cobalt germanide, RE{sub 6}Co{sub 5}Ge{sub 1+x}Al{sub 3−x} (RE=Pr, Nd; x≈0.8). United States. doi:10.1016/J.JSSC.2016.03.024.
Zhou, Sixuan, and Latturner, Susan E., E-mail: latturner@chem.fsu.edu. Wed . "Flux growth and magnetic properties of rare earth cobalt germanide, RE{sub 6}Co{sub 5}Ge{sub 1+x}Al{sub 3−x} (RE=Pr, Nd; x≈0.8)". United States. doi:10.1016/J.JSSC.2016.03.024.
@article{osti_22584119,
title = {Flux growth and magnetic properties of rare earth cobalt germanide, RE{sub 6}Co{sub 5}Ge{sub 1+x}Al{sub 3−x} (RE=Pr, Nd; x≈0.8)},
author = {Zhou, Sixuan and Latturner, Susan E., E-mail: latturner@chem.fsu.edu},
abstractNote = {The intermetallic compounds RE{sub 6}Co{sub 5}Ge{sub 1+x}Al{sub 3−x} (RE=Pr{sub ,} Nd) were synthesized from the reaction of germanium and aluminum in RE/Co eutectic flux. These phases crystallize with the Nd{sub 6}Co{sub 5}Ge{sub 2.2} structure type in hexagonal space group P-6m2 (a=9.203(2)Å, c=4.202(1) Å, R{sub 1}=0.0109 for Pr{sub 6}Co{sub 5}Ge{sub 1.80}Al{sub 2.20}; and a=9.170(3) Å, c=4.195(1) Å, R{sub 1}=0.0129 for Nd{sub 6}Co{sub 5}Ge{sub 1.74}Al{sub 2.26}). The structure features chains of face-sharing Ge@RE{sub 9} clusters intersecting hexagonal cobalt nets linked by aluminum atoms. Magnetic susceptibility measurements indicate that both phases exhibit ferromagnetic ordering of the cobalt layers with T{sub C} in the range of 130–140 K. The magnetic moments of the rare earth ions order at lower temperature (30–40 K). Magnetic measurements on oriented crystals of Nd{sub 6}Co{sub 5}Ge{sub 1.74}Al{sub 2.26} show a strong preference of the moments to order along the c-axis. - Graphical abstract: RE{sub 6}Co{sub 5}Ge{sub 1+x}Al{sub 3−x} (RE=Pr{sub ,} Nd) were grown as large crystals from reactions of Ge and Al in RE/Co eutectic melts. Magnetic measurements indicate ordering of the 2-D cobalt nets at 130–140 K, and ordering of the rare earth moments at 30–40 K. Display Omitted - Highlights: • RE{sub 6}Co{sub 5}Ge{sub 1+x}Al{sub 3−x} (RE=Pr{sub ,} Nd) grown as large crystals from RE/Co eutectic flux. • RE{sub 6}Co{sub 5}Ge{sub 1+x}Al{sub 3−x} structure features hexagonal cobalt nets stacked along c-axis. • Cobalt layers order ferromagnetically with T{sub c}=130–140 K. • Rare earth magnetic moments order at low temperature (30–40 K).},
doi = {10.1016/J.JSSC.2016.03.024},
journal = {Journal of Solid State Chemistry},
number = ,
volume = 238,
place = {United States},
year = {Wed Jun 15 00:00:00 EDT 2016},
month = {Wed Jun 15 00:00:00 EDT 2016}
}