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To provide a means for dissemination of a new temperature scale below 0.65 K, a device is being developed consisting of a number of superconducting reference points, the SRD1000. In comparison with the former SRM768 of NIST, the poisonous Be has been omitted, and IrRh alloys are introduced to fill in the gap between 15 and 100 mK. At the high temperatures Al and Zn are used to provide overlap with...
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