Regensburg 2013 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 16: Poster I
MA 16.67: Poster
Dienstag, 12. März 2013, 10:30–13:30, Poster D
Magnetic and structural properties of LiMn1−xNixPO4 — •Thomas Kolb1, Alexander Ottmann1, Carsten Jähne1, Hans-Peter Meyer2 und Rüdiger Klingeler1 — 1Kirchhoff Institute for Physics, University of Heidelberg, D-69120 Heidelberg, Germany — 2Institut für Geowissenschaften, University of Heidelberg, D-69120 Heidelberg, Germany
We present structural and magnetic properties of LiMn1−xNixPO4 with 0 ≤ x ≤ 0.5 synthesized by solid state reaction as well as by microwave-assisted hydrothermal synthesis. For both doping series, chemical analysis, i.e. Mn:Ni:P, performed by means of energy-dispersive X-ray analysis confirms that the actual Ni content agrees well to the nominal composition. Powder x-ray diffraction implies single-phase materials with orthorhombic olivine structure (Pnma). The evolution of lattice parameters obeys Vegard’s law and agrees to the fact that replacing Mn2+ by smaller Ni2+ corresponds to negative chemical pressure Δ V/V ≈ −8· 10−4/%Ni. While the onset of long-range antiferromagnetic order at TN = 32 K does not depend on the Ni-content, there are changes in the magnetic anisotropy.