Crystal Structure and Magnetic and Magnetocaloric Properties of Cobalt Hydroxychlorides Co2(OH)4–xClx

Sang Hoon Song; José Antonio Alonso; María Teresa Fernández-Díaz; Sang Ho Lim

doi:10.1002/ejic.201700104

Crystal Structure and Magnetic and Magnetocaloric Properties of Cobalt Hydroxychlorides Co₂(OH)_4–xCl_x

Sang Hoon Song, José Antonio Alonso, María Teresa Fernández-Díaz, Sang Ho Lim

Department of Materials Science and Engineering

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

Abstract

A series of isostructural cobalt hydroxychloride salts with the formula Co₂(OH)_4–xCl_x were fabricated by using a precipitation method from aqueous solutions of CoCl₂ and NaOH with different mixing ratios. The crystal structure was resolved from neutron powder diffraction data, including the location of H atoms of the hydroxide groups. The structure (space group R3m) consists of an open network of edge-sharing CoO₆ and CoO_6–2xCl_2x octahedra, forming intercrossed 1D channels where the hydrogen atoms reside. Unusually high values of the magnetic entropy change were observed for all samples, probably due to the geometrically frustrated magnetic structure; for example, the magnetic entropy change was 8.3 J/kg K for the sample with Co/Cl > 2.5 at 10 K in a magnetic field change of 20 kOe.

Original language	English
Pages (from-to)	2289-2294
Number of pages	6
Journal	European Journal of Inorganic Chemistry
Volume	2017
Issue number	16
DOIs	https://doi.org/10.1002/ejic.201700104
Publication status	Published - 2017 Apr 26

Keywords

Cobalt
Magnetic frustration
Magnetic properties
Structure elucidation
Transition metals

ASJC Scopus subject areas

Inorganic Chemistry

Access to Document

10.1002/ejic.201700104

Cite this

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title = "Crystal Structure and Magnetic and Magnetocaloric Properties of Cobalt Hydroxychlorides Co2(OH)4–xClx",

abstract = "A series of isostructural cobalt hydroxychloride salts with the formula Co2(OH)4–xClx were fabricated by using a precipitation method from aqueous solutions of CoCl2 and NaOH with different mixing ratios. The crystal structure was resolved from neutron powder diffraction data, including the location of H atoms of the hydroxide groups. The structure (space group R3m) consists of an open network of edge-sharing CoO6 and CoO6–2xCl2x octahedra, forming intercrossed 1D channels where the hydrogen atoms reside. Unusually high values of the magnetic entropy change were observed for all samples, probably due to the geometrically frustrated magnetic structure; for example, the magnetic entropy change was 8.3 J/kg K for the sample with Co/Cl > 2.5 at 10 K in a magnetic field change of 20 kOe.",

keywords = "Cobalt, Magnetic frustration, Magnetic properties, Structure elucidation, Transition metals",

author = "Song, {Sang Hoon} and Alonso, {Jos{\'e} Antonio} and Fern{\'a}ndez-D{\'i}az, {Mar{\'i}a Teresa} and Lim, {Sang Ho}",

note = "Funding Information: This work was supported by the Converging Research Center Program through the Ministry of Science, ICT and Future Planning, Korea (201505411), and the Basic Science Research Program through the National Research Foundation (NRF) funded by the Ministry of Education (2015063125). J. A. A. acknowledges the Spanish Ministry of Economy and Competitivity by funding the Project MAT2013-41099-R. This work is partially based on the results of experiments carried out at the Institut Laue Langevin, Grenoble, France. Publisher Copyright: {\textcopyright} 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim",

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AU - Fernández-Díaz, María Teresa

AU - Lim, Sang Ho

N1 - Funding Information: This work was supported by the Converging Research Center Program through the Ministry of Science, ICT and Future Planning, Korea (201505411), and the Basic Science Research Program through the National Research Foundation (NRF) funded by the Ministry of Education (2015063125). J. A. A. acknowledges the Spanish Ministry of Economy and Competitivity by funding the Project MAT2013-41099-R. This work is partially based on the results of experiments carried out at the Institut Laue Langevin, Grenoble, France. Publisher Copyright: © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

PY - 2017/4/26

Y1 - 2017/4/26

N2 - A series of isostructural cobalt hydroxychloride salts with the formula Co2(OH)4–xClx were fabricated by using a precipitation method from aqueous solutions of CoCl2 and NaOH with different mixing ratios. The crystal structure was resolved from neutron powder diffraction data, including the location of H atoms of the hydroxide groups. The structure (space group R3m) consists of an open network of edge-sharing CoO6 and CoO6–2xCl2x octahedra, forming intercrossed 1D channels where the hydrogen atoms reside. Unusually high values of the magnetic entropy change were observed for all samples, probably due to the geometrically frustrated magnetic structure; for example, the magnetic entropy change was 8.3 J/kg K for the sample with Co/Cl > 2.5 at 10 K in a magnetic field change of 20 kOe.

AB - A series of isostructural cobalt hydroxychloride salts with the formula Co2(OH)4–xClx were fabricated by using a precipitation method from aqueous solutions of CoCl2 and NaOH with different mixing ratios. The crystal structure was resolved from neutron powder diffraction data, including the location of H atoms of the hydroxide groups. The structure (space group R3m) consists of an open network of edge-sharing CoO6 and CoO6–2xCl2x octahedra, forming intercrossed 1D channels where the hydrogen atoms reside. Unusually high values of the magnetic entropy change were observed for all samples, probably due to the geometrically frustrated magnetic structure; for example, the magnetic entropy change was 8.3 J/kg K for the sample with Co/Cl > 2.5 at 10 K in a magnetic field change of 20 kOe.

KW - Cobalt

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KW - Structure elucidation

KW - Transition metals

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