The A{sup 2+}Mn{sub 5}(SO{sub 4}){sub 6} family of triangular lattice, ferrimagnetic sulfates

Journal Article · Mon Jun 15 00:00:00 EDT 2009 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2009.03.001· OSTI ID:21370420

McQueen, T M; Posen, I D ^[1]; Ke, X ^[2]; Huang, Q ^[3]; Zandbergen, H W ^[4]; Williams, A J ^[1]; Schiffer, P ^[2]; Cava, R J ^[1]

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1. Department of Chemistry, Princeton University, Princeton, NJ 08544 (United States)
2. Department of Physics and Materials Research Institute, Pennsylvania State University, University Park, PA 16802 (United States)
3. NIST Center for Neutron Research, Gaithersburg, MD 20899 (United States)
4. Kavli Institute for Nanoscience, Technical University of Delft (Netherlands)

A new family of anhydrous sulfates, A{sup 2+}Mn{sub 5}(SO{sub 4}){sub 6} (A=Pb, Ba, Sr) is reported. The crystal structures of PbMn{sub 5}(SO{sub 4}){sub 6} and SrMn{sub 5}(SO{sub 4}){sub 6} are solved by powder X-ray and neutron diffraction. BaMn{sub 5}(SO{sub 4}){sub 6} is isostructural. PbMn{sub 5}(SO{sub 4}){sub 6} crystallizes with P3-bar symmetry and unit cell parameters of a=14.551(1) A and c=7.535(1) A. The structure has rich features, including dimers of face-sharing MnO{sub 6} octahedra, and two complementary triangular layers of Mn atoms. All compounds undergo a magnetic ordering transition at 10 K, below which, the magnetic susceptibility of the compounds varies systematically with the radius of the non-magnetic cation. Low temperature neutron diffraction shows that the complementary triangular layers result in a ferrimagnet with a net moment corresponding to one high spin Mn{sup 2+} per unit cell, correlating well with the magnetization data. The non-magnetic variant PbMg{sub 5}(SO{sub 4}){sub 6} is also reported. - Graphical abstract: A new family sulfates, A{sup 2+}Mn{sub 5}(SO{sub 4}){sub 6} (A=Pb, Ba, Sr) is reported. Structures are solved by powder neutron diffraction. PbMn{sub 5}(SO{sub 4}){sub 6} is trigonal with lattice parameters of a=14.551(1) A and c=7.535(1) A. The structure has dimers of face-sharing MnO{sub 6} octahedra, and two complementary triangular layers of Mn atoms that result in a ferrimagnet. All compounds magnetically order at 10 K. Low field susceptibility varies systematically with non-magnetic cation radius.

• OSTI ID: 21370420
• Journal Information: Journal of Solid State Chemistry, Vol. 182, Issue 6; Other Information: DOI: 10.1016/j.jssc.2009.03.001; PII: S0022-4596(09)00094-2; Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM COMPOUNDS
CRYSTAL STRUCTURE
CRYSTALLOGRAPHY
LATTICE PARAMETERS
LAYERS
LEAD COMPOUNDS
MAGNETIC SUSCEPTIBILITY
MAGNETISM
MAGNETIZATION
MANGANESE IONS
MANGANESE SULFATES
NEUTRON DIFFRACTION
STRONTIUM COMPOUNDS
X-RAY DIFFRACTION
ALKALINE EARTH METAL COMPOUNDS
CHARGED PARTICLES
COHERENT SCATTERING
DIFFRACTION
IONS
MAGNETIC PROPERTIES
MANGANESE COMPOUNDS
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SCATTERING
SULFATES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS