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- W2065084997 abstract "Thallium ruthenium oxides, Tl2Ru2O7−δ, with the pyrochlore structure were synthesized under a pressure of 1–5 GPa and 1173 K and characterized by resistivity, magnetization, and TOF neutron-diffraction measurements. The oxygen vacancy,δ, varied with the synthesis conditions and significantly affected their electrical properties. The pyrochlores synthesized at high pressure and atmospheric pressure are classified into four groups which depend on their oxygen nonstoichiometry. (i) Nonstoichiometric Tl2Ru2O6.71shows a metallic conductivity with almost temperature-independent magnetization. (ii) Stoichiometric Tl2Ru2O7synthesized under high oxygen pressure using KClO4shows a metallic–semiconducting transition at 120 K with magnetization anomalies at 120 and 40 K. (iii) Slightly nonstoichiometric Tl2Ru2O6.96shows spin-glass-like behavior around 40 K accompanying a resistivity increase at the transition. (iv) Tl2Ru2O7synthesized at 773 K and atmospheric pressure is semiconducting with magnetization anomalies at 120 and 40 K. The change from the metallic to semiconducting state is discussed from the viewpoint of structure changes." @default.
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- W2065084997 date "1998-11-01" @default.
- W2065084997 modified "2023-09-28" @default.
- W2065084997 title "High-Pressure Synthesis, Crystal Structure, and Metal–Semiconductor Transitions in the Tl2Ru2O7−δPyrochlore" @default.
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- W2065084997 doi "https://doi.org/10.1006/jssc.1998.7848" @default.
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