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Composition-tuning in a solid-state electrotransport furnace with active thermal expansion compensation.
Review of Scientific Instruments 2016 December
A new solid-state electrotransport (SSE) apparatus for refining ultra-pure single crystals of metallic compounds under ultra-high vacuum is described. The setup employs a novel thermal expansion compensation mechanism to minimize mechanical stress on the sample during refinement with cold clamps for contamination-less purification at elevated temperatures. The apparatus is designed to tune the composition of initially slightly off-stoichiometric samples. The expansion compensation and stress-free operation were tested by recording the thermal expansion of elemental cerium in a treatment up to 655 °C. SSE refinement was then performed on a high-quality single crystal of U6 Fe resulting in a 50% increase of its residual resistivity ratio to the highest value obtained for a single crystal to date.
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