Two modifications of layered cobaltous terephthalate: Crystal structures and magnetic properties

Kurmoo, M. and Kumagai, H. and Green, M.A. and Lovett, B.W. and Blundell, S.J. and Ardavan, A. and Singleton, J. (2001) Two modifications of layered cobaltous terephthalate: Crystal structures and magnetic properties. Journal of Solid State Chemistry, 159 (2). pp. 343-351. ISSN 0022-4596. (doi:https://doi.org/10.1006/jssc.2001.9163) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Official URL
http://dx.doi.org/10.1006/jssc.2001.9163

Abstract

The synthesis, characterization, crystal structure, and magnetic properties of Co2(OH)2BDC and Co(H2O)2BDC (BDC is benzene 1,4-dicarboxylate or terephthalate, O2CC6H4CO2) are reported. Co2(OH)2BDC (C2/m, a=19.952, b=3.286, c=6.295 Ã?, β=95.84°, Z=2, V=410.6 Ã?3) consists of two types of edge-sharing CoO6 chains that are connected to each other by OH (Co-O-Co bridges) to form layers that are further joined together through terephthalate. It exhibits unusual magnetic properties: above 48 K it displays paramagnetism, between 44 and 48 K it behaves as a collinear antiferromagnet, and below 44 K a weak spontaneous magnetization is observed in very low applied fields. At higher fields metamagnetic behavior is observed. Two types of hysteresis loops are observed, one centered about zero field and the second about the metamagnetic critical field. The critical field and the hysteresis width increase as the temperature is lowered; the latter exceeds 50 kOe at 2 K. The unusual large coercivity may be due to the large single-ion anisotropy of Co(II) and its pronounced increase at low temperature. Co(H2O)2BDC (C2/c, a=18.274, b=6.543, c=7.296 Ã?, β=98.6°, Z=4, V=862.5 Ã?3) consists of layers of separated octahedral CoO6 connected via Co-O-C-O-Co. It is paramagnetic and obeys the Curie-Weiss law (Î?=-27 K). © 2001 Academic Press.

Item Type: Article
Additional information: Unmapped bibliographic data: LA - English [Field not mapped to EPrints] J2 - J. Solid State Chem. [Field not mapped to EPrints] AD - IPCMS, 23 rue du Loess, 67037 Strasbourg, France [Field not mapped to EPrints] DB - Scopus [Field not mapped to EPrints]
Uncontrolled keywords: carboxylic acid derivative, cobalt derivative, terephthalic acid, anisotropy, article, crystal structure, hysteresis, low temperature, magnetic field, magnetism, synthesis
Subjects: Q Science > QC Physics > QC173.45 Condensed Matter
Q Science > QD Chemistry > QD478 Solid State Chemistry
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Giles Tarver
Date Deposited: 21 Oct 2015 15:08 UTC
Last Modified: 23 Oct 2015 11:21 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/51145 (The current URI for this page, for reference purposes)
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