Abstract
Single crystals of the thallium ruthenium pyrochlore have been grown by flux method under high oxygen pressure. The growth conditions were determined by direct observations using in situ powder X-ray diffraction (XRD) method under high pressure and high temperature. The crystals were grown using NaCl–KCl flux at 1350 °C and B 2O 3 flux at 1150 °C. High growth temperature of 1350 °C for the NaCl–KCl flux caused Pt contamination from the crucible and oxygen deficiency for the crystals obtained. The crystal growth using B 2O 3 flux proceeded at lower temperature by grain growth with material transfer through B 2O 3. The crystal obtained was characterized by single-crystal XRD method, and was found to have a stoichiometric composition, Tl 2Ru 2O 7− δ ( δ=0), with a structural phase transition around 120 K. The grain growth technique with B 2O 3 is efficient for high-temperature single-crystal growth under high pressure.
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