Regensburg 2013 – scientific programme

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MA: Fachverband Magnetismus

MA 16: Poster I

MA 16.67: Poster

Tuesday, March 12, 2013, 10:30–13:30, Poster D

Magnetic and structural properties of LiMn_1−xNi_xPO₄ — •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 LiMn_1−xNi_xPO₄ 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 T_N = 32 K does not depend on the Ni-content, there are changes in the magnetic anisotropy.