Growth and characterization of RuO2 single crystals

Abstract Using the vapor transport technique in a flowing oxygen system, we have grown the largest single crystals of RuO 2 ever reported (10 mm × 5 mm × 5 mm). Polycrystalline RuO 2 , a mixture of polycrystalline RuO 2 and purified Ru metal powder, or purified Ru metal powder were used as the starting material. Optimum conditions are given for growing large high quality crystals. The morphology, stoichiometry and resistivity of selected single crystals of RuO 2 are discussed.