The structure of dilanthanum ruthenium pentoxide was solved by powder neutron diffraction at room temperature and 1.5 K. High-temperature La2RuO5 crystallizes in the monoclinic space group P2(1)/c. Upon cooling, the sample undergoes a phase transition to the triclinic low-temperature form (space group P-1). This transition leads to pronounced changes in the Ru-O-Ru bond distances, resulting in a dimerization of the ruthenium ions.
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