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  lonothermal synthesis of open-framework metal phosphates with a Kagome lattice network exhibiting canted anti-ferromagnetism

Wang, G., Valldor, M., Mallick, B., & Mudring, A.-V. (2014). lonothermal synthesis of open-framework metal phosphates with a Kagome lattice network exhibiting canted anti-ferromagnetism. Journal of Materials Chemistry C, 2(35), 7417-7427. doi:10.1039/C4TC00290C.

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Wang, Guangmei1, Author
Valldor, Martin2, Author              
Mallick, Bert1, Author
Mudring, Anja-Verena1, Author
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1external, ou_persistent22              
2Martin Valldor, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863454              

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 Abstract: Four open-framework transition-metal phosphates; (NH4)(2)CO3(HPO4)(2)F-4 (1), (NH4)CO3(HPO4)(2)(H2PO4)F-2 (2), KCo3(HPO4)(2)(H2PO4)F-2 (3), and KFe3(HPO4)(2)(H2PO4)F-2 (4); are prepared by ionothermat synthesis using pyridinium hexafluorophosphate as the ionic liquid. Single-crystal X-ray diffraction analyses reveal that the four compounds contain cobalt/iron-oxygen/fluoride layers with Kagorne topology composed of interlinked face-sharing MO3F3/MO4F2 octahedra. PO3OH pseudo-tetrahedral groups augment the [M3O6F4] (1)/[M3O8F2] layers on both sides to give M-3(HPO4)(2)F-4 (1) and M-3(HPO4)(2)F-2 (2-4) layers. These layers are stacked along the a axis in a sequence AA..., resulting in the formation of a layer structure for (NH4)(2)CO3(HPO4)(2)F-4(1). In NH4CO3(HPO4)(2)(H2PO4)F-2 and KM3(HPO4)2(H2PO4)F-2, the M-3(HPO4)(2)F-2 layers are stacked along the a axis in a sequence AA(i)... and are connected by [PO3(OH)] tetrahedra, giving rise to a 3-D open framework structure with 10-ring channels along the [001] direction. The negative charges of the inorganic framework are balanced by K+/NH4+ ions located within the channels. The magnetic transition metal cations themselves form layers with stair-case Kagome topology. Magnetic susceptibility and magnetization measurements reveal that all four compounds exhibit a canted antiferromagnetic ground state (T-c = 10 or 13 K for Co and T-c = 27 K for Fe) with different canting angles. The full orbital moment is observed for both Co2+ and Fe2+

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 Dates: 2014-09-21
 Publication Status: Published in print
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 Identifiers: ISI: 000341280000033
DOI: 10.1039/C4TC00290C
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Title: Journal of Materials Chemistry C
Source Genre: Journal
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Publ. Info: Cambridge, UK : Royal Society of Chemistry
Pages: - Volume / Issue: 2 (35) Sequence Number: - Start / End Page: 7417 - 7427 Identifier: ISSN: 2050-7526
CoNE: https://pure.mpg.de/cone/journals/resource/2050-7526