Synthesis, crystal structure, and valence states of Mn-substituted $La_{2}RuO_{5}$

Riegg, S.; Loidl, A.; Garcia-Garcia, F. J.; Ebbinghaus, Stefan; Reller, A.

doi:10.1103/PhysRevB.90.024406

Journal Article

DESY-2014-03036

Synthesis, crystal structure, and valence states of Mn-substituted $La_{2}RuO_{5}$

Riegg, S. (Corresponding Author)Extern* ; Garcia-Garcia, F. J. ; Reller, A. ; Loidl, A. ; Ebbinghaus, S.Extern*

2014
APS College Park, Md.

Physical review / B 90(2), 024406 (2014) [10.1103/PhysRevB.90.024406]

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Abstract: Polycrystalline samples of layered perovskite-related La2Ru1−yMnyO5 (0≤y≤0.25) were prepared by a soft-chemistry synthesis based on the thermal decomposition of a citrate precursor. The crystal structures of the compounds were determined by Rietveld analysis of x-ray diffraction patterns recorded at different temperatures. Additional neutron diffraction patterns for La2Ru0.75Mn0.25O5 were recorded between 1.5 K and 300 K. A structural phase transition from a monoclinic room-temperature to a triclinic low-temperature phase was observed for y≤0.20, while for y=0.25 a phase separation at low temperatures was identified. The structural phase-transition temperatures decrease with increasing Mn concentration. Selected area electron diffraction of La2Ru0.75Mn0.25O5 documented the absence of cationic ordering of Ru and Mn. The Mn and Ru oxidation states were determined using x-ray absorption spectroscopy and showed a stable +4 valence for both elements in all samples investigated, at room temperature as well as at 110 K.

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