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Title: Hierarchical cobalt-formate framework series with (4{sup 12}⋅6{sup 3})(4{sup 9}⋅6{sup 6}){sub n} (n = 1–3) topologies exhibiting slow dielectric relaxation and weak ferromagnetism

The employment of linear di-, tri-, and tetra-ammoniums has generated a hierarchy in the binodal (4{sup 12}⋅6{sup 3})(4{sup 9}⋅6{sup 6}){sub n} topologies with n = 1, 2, and 3, respectively, for the cobalt formate frameworks with increasing length of the cavities to match the ammoniums. This indicates the length-directing effect of the polyammoniums. The dynamic movements of polyammoniums between favored sites or orientations within the cavities lead to slow dielectric relaxations. All materials are spin-canted antiferromagnets in low temperatures and show reduced spontaneous magnetizations from di- and tri-, to tetra-ammoniums, because of the increased number of unique Co ions or the antiferromagnetically coupled sublattices.
Authors:
; ; ; ; ; ;  [1] ;  [2]
  1. Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871 (China)
  2. Institut de Chimie de Strasbourg, CNRS-UMR 7177, Université de Strasbourg, 4 rue Blaise Pascal, 67000 Strasbourg Cedex (France)
Publication Date:
OSTI Identifier:
22303421
Resource Type:
Journal Article
Resource Relation:
Journal Name: APL Materials; Journal Volume: 2; Journal Issue: 12; Other Information: (c) 2014 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COBALT; COBALT IONS; DIELECTRIC MATERIALS; FERROMAGNETISM; FORMATES; MAGNETIZATION; RELAXATION