New phases in the system LiMnVO{sub 4}-Mn{sub 3}(VO{sub 4}){sub 2}
- Universitaet des Saarlandes, Institut fuer Anorganische und Analytische Chemie und Radiochemie, Am Markt, Zeile 5, 66125 Saarbruecken (Germany)
- Universitaet des Saarlandes, Anorganische Festkoerperchemie, Am Markt, Zeile 3, 66125 Saarbruecken (Germany)
The synthesis of orthorhombic Mn{sub 3}(VO{sub 4}){sub 2} via a simple solid state route as well as the description of a new tetragonal high temperature phase are reported in this paper. Additionally, the system LiMnVO{sub 4}-Mn{sub 3}(VO{sub 4}){sub 2} (=Mn{sub 1.5}VO{sub 4}), described by the formula Li{sub x}Mn{sub 1.5-x/2}VO{sub 4}, is investigated in detail, showing that substitution of one Mn{sup 2+} in Mn{sub 1.5}VO{sub 4} by two Li{sup +} ions favors the formation of the tetragonal high temperature phase for x{<=}0.22. This substitution is facilitated by the statistical half occupancy of the 4b site by Mn{sup 2+} in tetragonal Mn{sub 1.5}VO{sub 4}, whereas additional crystallographic sites would have to be occupied in the orthorhombic phase. The inverse substitution of Li by Mn in orthorhombic LiMnVO{sub 4} is also shown to be possible in the range 0.72{<=}x{<=}1. For 0.22{<=}x{<=}0.72, there is a large miscibility gap with a two phase mixture of the tetragonal Mn{sub 1.5}VO{sub 4} type and orthorhombic LiMnVO{sub 4} type phases. - Graphical Abstract: The unusual coordination of Mn in the form of a stella quadrangula with the surrounding vanadate groups. Highlights: > First synthesis of orthorhombic Mn{sub 3}(VO{sub 4}){sub 2} via a simple solid state route. > The crystal chemistry of the phases involved is rather complicated and it depends on the amount of Li that is incorporated. > System LiMnVO{sub 4}-Mn{sub 3}(VO{sub 4}){sub 2} (=Mn{sub 1.5}VO{sub 4}), described by the formula Li{sub x}Mn{sub 1.5-x/2}VO{sub 4}, is investigated in detail.
- OSTI ID:
- 21580016
- Journal Information:
- Journal of Solid State Chemistry, Vol. 184, Issue 10; Other Information: DOI: 10.1016/j.jssc.2011.07.042; PII: S0022-4596(11)00421-X; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CRYSTALLOGRAPHY
CRYSTALS
LITHIUM
LITHIUM IONS
MANGANESE
MANGANESE IONS
MIXTURES
ORTHORHOMBIC LATTICES
PHASE TRANSFORMATIONS
SOLIDS
SYNTHESIS
TEMPERATURE RANGE 0400-1000 K
VANADATES
ALKALI METALS
CHARGED PARTICLES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DISPERSIONS
ELEMENTS
IONS
METALS
OXYGEN COMPOUNDS
TEMPERATURE RANGE
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
VANADIUM COMPOUNDS