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Single crystals of the novel strontium osmate Sr3Os4O14 have been grown bythe hydrothermal method using opposed anvil high-pressure and high-temperaturetechnique. The reaction took place in sealed gold capsules at 3 GPa and atemperature of 1100 C, with water acting as a solvent. The employed methodyields up to 1 mm crystals with quite uncommon double-terminated morphologies.The crystal structure was identified as tetragonal by single-crystal X-raydiffraction, with lattice parameters a = 12.2909(8) A and c = 7.2478(5) A. Thestructural analysis suggests P42nm or P42/mnm as a possible space group. Ingeneral, the structure belongs to the pyrochlore type and is composed of anetwork of symmetrically arranged OsO6 octahedra. Resistivity measurementsevidence a metallic behavior, accompanied by a temperature-independentparamagnetism. Heat capacity measurements reveal a slightly enhanced value ofthe Sommerfeld coefficient 34 mJ/mol K2. Superconductivity has not beenobserved down to 2 K.

High-pressure hydrothermal growth and characterization of Sr3Os4O14 single crystals