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Structural and magnetic properties of the low-dimensional fluoride beta-FeF3(H2O)(2)center dot H2O
KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Kemisk apparatteknik.ORCID-id: 0000-0002-3239-5188
Vise andre og tillknytning
2015 (engelsk)Inngår i: Dalton Transactions, ISSN 1477-9226, E-ISSN 1477-9234, Vol. 44, nr 31, s. 14130-14138Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

We have reinvestigated the crystal structure of the low-dimensional fluoride beta-FeF3(H2O)(2)center dot H2O using high resolution neutron and X-ray diffraction data. Moreover we have studied the magnetic behavior of this material combining medium resolution and high flux neutron powder diffraction together with magnetic susceptibility measurements. This fluoride compound exhibits vertex-shared 1D Fe3+ octahedral chains, which are extended along the c-axis. The magnetic interactions between adjacent chains involve super-superexchange interactions via an extensive network of hydrogen bonds. This interchain hydrogen bonding scheme is sufficiently strong to induce a long range magnetic order appearing below T = 20(1) K. The magnetic order is characterized by the propagation vector k = (0, 0, 1/2), giving rise to a strictly antiferromagnetic structure where the Fe3+ spins are lying within the ab-plane. Magnetic exchange couplings extracted from magnetization measurements are found to be J(II)/k(b) = -18 K and J(perpendicular to)/k(b) = -3 K. These values are in good agreement with the neutron diffraction data, which show that the system became anti-ferromagnetically ordered at ca. T-N = 20(1) K.

sted, utgiver, år, opplag, sider
2015. Vol. 44, nr 31, s. 14130-14138
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URN: urn:nbn:se:kth:diva-173292DOI: 10.1039/c5dt02242hISI: 000359089100040PubMedID: 26174497OAI: oai:DiVA.org:kth-173292DiVA, id: diva2:852551
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QC 20150909

Tilgjengelig fra: 2015-09-09 Laget: 2015-09-09 Sist oppdatert: 2017-12-04bibliografisk kontrollert

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