Details

Autor(en) / Beteiligte

• Zhigadlo, N.D.

Titel

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.