An anhydrous high-pressure synthesis route to rutile type RhO2

Gérard Demazeau (1) , Alexey Baranov (2) , Rainer Pöttgen (3) , Lorenz Kienle (4) , Manfred H. Möller (3) , Rolf-Dieter Hoffmann (3) , Martin Valldor (5)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
2 Chair of Radiochemistry, Department of Chemistry
3 Institut für Anorganische Chemie
4 Max-Planck-Institut für Festkörperforschung
5 Institut für Physik der Kondensierten Materie

A new anhydrous high-pressure synthesis route was developed for rutile type RhO2. Rhodium(III) chloride was reacted with Na2O2 at 600 ◦C under an oxygen pressure of 200 MPa yielding RhO2 and NaCl. X-ray powder diffractometer data and TEM observations confirmed the rutile structure: P42/mnm, a = 448.7(1), c = 308.9(1) pm, x(O) = 0.3125(8), leading to Rh–O distances of 195.0 (4×) and 198.3 pm (2×) in the slightly elongated octahedra. Structural transformations associated with the production of oxygen vacancies can be initiated by electron-beam heating.

Mots clés: High-pressure; Synthesis; Crystal Chemistry

Domaines: Matériaux

Gérard Demazeau, Alexey Baranov, Rainer Pöttgen, Lorenz Kienle, Manfred H. Möller, et al.. An anhydrous high-pressure synthesis route to rutile type RhO2. Zeitschrift fur Naturforschung B, 2006, 61 (12), pp.1500-1506. ⟨10.1515/znb-2006-1206⟩. ⟨hal-00123302⟩