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High-pressure hydrothermal growth and characterization of Sr3Os4O14 single crystals
Ist Teil von
Journal of crystal growth, 2023-12, Vol.623, p.127407, Article 127407
Ort / Verlag
Elsevier B.V
Erscheinungsjahr
2023
Quelle
Elsevier ScienceDirect Journals
Beschreibungen/Notizen
•Novel Sr3Os4O14 crystals were grown by hydrothermal high-pressure method.•Crystals of Sr3O4O14 crystallize in a pyrochlore-like structure.•Sr3Os4O14 crystals have peculiar morphology in form of double terminated end points.•Sr3Os4O14 is metallic and superconductivity has not observed down to 2 K.•Methodology can be useful for hydrothermal synthesis of other contemporary materials.
Single crystals of the novel strontium osmate Sr3Os4O14 have been grown by the hydrothermal method using opposed anvil high-pressure and high-temperature technique. The reaction took place in sealed gold capsules at 3 GPa and a temperature of 1100 °C, with water acting as a solvent. The employed method yields up to 1 mm crystals with quite uncommon double-terminated morphologies. The crystal structure was identified as tetragonal by single-crystal X-ray diffraction, with lattice parameters a = 12.2909(8) Å and c = 7.2478(5) Å. The structural analysis suggests P42nm or P42/mnm as a possible space group. In general, the structure belongs to the pyrochlore type and is composed of a network of symmetrically arranged OsO6 octahedra. Resistivity measurements evidence a metallic behavior, accompanied by a temperature-independent paramagnetism. Heat capacity measurements reveal a slightly enhanced value of the Sommerfeld coefficient γ = 34 mJ/mol K2. Superconductivity has not been observed down to 2 K.