High-pressure optical floating-zone growth of Li(Mn,Fe)PO4 single crystals

Mm-sized LiMn1−xFexPO4 single crystals with 0⩽x⩽1 were grown by means of the traveling floating-zone technique at elevated Argon pressure of 30bar. For the various doping levels, the growth process was optimized with respect to the composition-dependant effective light absorption and transparency of...

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Hauptverfasser: Neef, Christoph (VerfasserIn) , Wadepohl, Hubert (VerfasserIn) , Meyer, Hans-Peter (VerfasserIn) , Klingeler, Rüdiger (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 27 January 2017
In: Journal of crystal growth
Year: 2017, Jahrgang: 462, Pages: 50-59
DOI:10.1016/j.jcrysgro.2017.01.046
Online-Zugang:Verlag, Volltext: http://dx.doi.org/10.1016/j.jcrysgro.2017.01.046
Verlag, Volltext: http://www.sciencedirect.com/science/article/pii/S002202481730060X
Volltext
Verfasserangaben:Christoph Neef, Hubert Wadepohl, Hans-Peter Meyer, Rüdiger Klingeler

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520 |a Mm-sized LiMn1−xFexPO4 single crystals with 0⩽x⩽1 were grown by means of the traveling floating-zone technique at elevated Argon pressure of 30bar. For the various doping levels, the growth process was optimized with respect to the composition-dependant effective light absorption and transparency of the materials. A convex crystal/melt interface, determined by the angle of incident light, was identified to be particularly crucial for a successful growth. The resulting large single crystalline grains are stoichiometric. Structure refinement shows that lattice parameters as well as the atomic positions and bond lengths linearly depend on the Mn:Fe-ratio. Oriented cuboidal samples with several mm3 of volume were used for magnetic studies which imply an antiferromagnetic ground state for all compositions. The Néel-temperature changes from TN=32.5(5)K in LiMnPO4 to 49.5(5)K in LiFePO4 while the easy magnetic axis in the ordered phase flips from the crystallographic a- to the b-axis upon Fe-doping of x<0.2. 
650 4 |a A2. Floating zone technique 
650 4 |a A2. Single crystal growth 
650 4 |a B1. Phosphates 
650 4 |a B2. Lithium-ion battery materials 
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