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Issue 3, 2020
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Open-framework ammonium transition metal fluorophosphates with a Kagomé lattice network: synthesis, structure and magnetic properties

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Abstract

Two open-framework transition metal fluorophosphates (NH4)M3(PO3F)2(PO2F2)F2 (M = Mn and Co) have been synthesized under fluoride-rich hydrothermal conditions at 493 K. The structure consists of triplets of face-sharing trans-MO4F2 octahedra linked by PO3F groups to form 2D layers. These 2D layers with formula [M3(PO3F)2O2F2]3− in the ab plane are bridged by PO2F2 groups to generate a 3D open framework with 1D channels filled with ammonium cations. The XPS spectra suggested the existence of Mn(II) and Co(II) in the corresponding compounds. Further, the XPS F 1s spectra indicated that fluorine anions bridged both the M and P centres. The two compounds feature transition metal layers with a staircase Kagomé network. This topology promotes magnetic frustration, which exhibits a canted antiferromagnetic ground state (Tc = 8.0 K for Mn and Tc = 9.2 K for Co).

Graphical abstract: Open-framework ammonium transition metal fluorophosphates with a Kagomé lattice network: synthesis, structure and magnetic properties

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Article information


Submitted
18 Aug 2019
Accepted
14 Dec 2019
First published
19 Dec 2019

Dalton Trans., 2020,49, 841-849
Article type
Paper

Open-framework ammonium transition metal fluorophosphates with a Kagomé lattice network: synthesis, structure and magnetic properties

J. Jiang, B. Zhu, T. Zhu, H. Yang, Y. Jin and M. Lü, Dalton Trans., 2020, 49, 841
DOI: 10.1039/C9DT03370J

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