Synthesis, crystal structure, and magnetism of A2Co12As7 (A=Ca, Y, Ce–Yb)
Abstract
In this study, ternary intermetallics, A2Co12As7 (A=Ca, Y, Ce–Yb), have been synthesized by annealing mixtures of elements in molten Bi at 1223 K. The materials obtained crystallize in the P63/m variant of the Zr2Fe12P7 structure type. The unit cell volume shows a monotonic decrease with the increasing atomic number of the rare-earth metal, with the exception of Ce-, Eu-, and Yb-containing compounds. An examination of these outliers with X-ray absorption near edge structures (XANES) spectroscopy revealed mixed valence of Ce, Eu, and Yb, with the average oxidation states of +3.20(1), +2.47(5), and +2.91(1), respectively, at room temperature. Magnetic behavior of A2Co12As7 is generally characterized by ferromagnetic ordering of Co 3d moments at 100–140 K, followed by low-temperature ordering of rare-earth 4f moments. The 3d-4f magnetic coupling changes from antiferromagnetic for A=Pr–Sm to ferromagnetic for A=Ce and Eu–Yb. Finally, polarized neutron scattering experiments were performed to support the postulated ferro- and ferrimagnetic ground states for Ce2Co12As7 and Nd2Co12As7, respectively.
- Authors:
-
- Florida State Univ., Tallahassee, FL (United States). Dept. of Chemistry and Biochemistry
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
- National Research Nuclear Univ., Moscow (Russia). Moscow Engineering Physics Inst.
- National Research Nuclear Univ., Moscow (Russia). Moscow Engineering Physics Inst.; European XFEL GmbH, Hamburg (Germany)
- Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
- Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany). Photon Science
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); Russian Science Foundation
- OSTI Identifier:
- 1261277
- Alternate Identifier(s):
- OSTI ID: 1279011
- Grant/Contract Number:
- AC05-00OR22725; DMR-1507233; 14-22-00098
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Solid State Chemistry
- Additional Journal Information:
- Journal Volume: 236; Journal ID: ISSN 0022-4596
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Flux synthesis; Crystal growth; Arsenides; Itinerant magnetism; Mixed valence
Citation Formats
Tan, Xiaoyan, Ovidiu Garlea, V., Chai, Ping, Geondzhian, Andrey Y., Yaroslavtsev, Alexander A., Xin, Yan, Menushenkov, Alexey P., Chernikov, Roman V., and Shatruk, Michael. Synthesis, crystal structure, and magnetism of A2Co12As7 (A=Ca, Y, Ce–Yb). United States: N. p., 2015.
Web. doi:10.1016/j.jssc.2015.08.038.
Tan, Xiaoyan, Ovidiu Garlea, V., Chai, Ping, Geondzhian, Andrey Y., Yaroslavtsev, Alexander A., Xin, Yan, Menushenkov, Alexey P., Chernikov, Roman V., & Shatruk, Michael. Synthesis, crystal structure, and magnetism of A2Co12As7 (A=Ca, Y, Ce–Yb). United States. https://doi.org/10.1016/j.jssc.2015.08.038
Tan, Xiaoyan, Ovidiu Garlea, V., Chai, Ping, Geondzhian, Andrey Y., Yaroslavtsev, Alexander A., Xin, Yan, Menushenkov, Alexey P., Chernikov, Roman V., and Shatruk, Michael. Fri .
"Synthesis, crystal structure, and magnetism of A2Co12As7 (A=Ca, Y, Ce–Yb)". United States. https://doi.org/10.1016/j.jssc.2015.08.038. https://www.osti.gov/servlets/purl/1261277.
@article{osti_1261277,
title = {Synthesis, crystal structure, and magnetism of A2Co12As7 (A=Ca, Y, Ce–Yb)},
author = {Tan, Xiaoyan and Ovidiu Garlea, V. and Chai, Ping and Geondzhian, Andrey Y. and Yaroslavtsev, Alexander A. and Xin, Yan and Menushenkov, Alexey P. and Chernikov, Roman V. and Shatruk, Michael},
abstractNote = {In this study, ternary intermetallics, A2Co12As7 (A=Ca, Y, Ce–Yb), have been synthesized by annealing mixtures of elements in molten Bi at 1223 K. The materials obtained crystallize in the P63/m variant of the Zr2Fe12P7 structure type. The unit cell volume shows a monotonic decrease with the increasing atomic number of the rare-earth metal, with the exception of Ce-, Eu-, and Yb-containing compounds. An examination of these outliers with X-ray absorption near edge structures (XANES) spectroscopy revealed mixed valence of Ce, Eu, and Yb, with the average oxidation states of +3.20(1), +2.47(5), and +2.91(1), respectively, at room temperature. Magnetic behavior of A2Co12As7 is generally characterized by ferromagnetic ordering of Co 3d moments at 100–140 K, followed by low-temperature ordering of rare-earth 4f moments. The 3d-4f magnetic coupling changes from antiferromagnetic for A=Pr–Sm to ferromagnetic for A=Ce and Eu–Yb. Finally, polarized neutron scattering experiments were performed to support the postulated ferro- and ferrimagnetic ground states for Ce2Co12As7 and Nd2Co12As7, respectively.},
doi = {10.1016/j.jssc.2015.08.038},
journal = {Journal of Solid State Chemistry},
number = ,
volume = 236,
place = {United States},
year = {Fri Aug 28 00:00:00 EDT 2015},
month = {Fri Aug 28 00:00:00 EDT 2015}
}
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