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Synthesis, crystal structure and magnetic properties of a new copper oxo-antimony sulphate CuSb6O8(SO4)(2)
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
Rekke forfattare: 42016 (engelsk)Inngår i: Dalton Transactions, ISSN 1477-9226, E-ISSN 1477-9234, Vol. 45, nr 1, s. 392-396Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The new copper oxo-antimony sulphate CuSb6O8(SO4)(2) crystallizes in the triclinic space group P (1) over bar with the unit cell parameters a = 5.5342(4) angstrom, b = 7.6706(6) angstrom, c = 9.2374(7) angstrom, alpha = 96.505(5)degrees, beta = 93.818(4)degrees, gamma = 109.733(4)degrees and Z = 1. The crystal structure is made up of layers stacking along [001]. The layers are charge neutral and are connected to each other by only weak interactions. The copper atoms adopt a square planar [CuO4] coordination and such units are well separated from each other by corner and edge sharing to [SbO4] building blocks. The latter polymerize to form sheets with the formula [Sb3O8](infinity). Sulphate groups connect to the antimony oxide sheets by corner sharing and are located at the interface of the layers. Above similar to 10 K the magnetic susceptibility follows very well a Curie-Weiss law whereas below 10 K increasing deviations indicate the onset of antiferromagnetic correlations. Fitting the data in the range 10-50 K yields a Curie-Weiss temperature theta of -2.25(5) K. A sharp anomaly centered at T-C = 0.67 K in the heat capacity data indicates long-range magnetic ordering. Short range antiferromagnetic correlations well above T-C are seen in the magnetic contribution to the heat capacity and the magnetic susceptibility. These can be well described by the magnetism of a spin S = 1/2 Heisenberg chain with the nearest neighbor antiferromagnetic spin exchange interaction of J(intra) = similar to 2.8 K.

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2016. Vol. 45, nr 1, s. 392-396
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URN: urn:nbn:se:su:diva-126191DOI: 10.1039/c5dt04157kISI: 000366429000042OAI: oai:DiVA.org:su-126191DiVA, id: diva2:898684
Tilgjengelig fra: 2016-01-29 Laget: 2016-01-26 Sist oppdatert: 2017-11-30bibliografisk kontrollert

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