This part of IEC 61788 addresses a test method for the determination of the residual resistance ratio (RRR),rRRR, of cavity-grade niobium. This method is intended for high-purity niobium grades with 15 < rRRR < 600. The test method should be valid for specimens with rectangular or round cross-section, cross-sectional area greater than 1 mm2 but less than 20 mm2, and a length not less than 10 nor more than 25 times the width or diameter.
IEC 61788-23:2018 Referenced Document
IEC 60050-815:2015 International Electrotechnical Vocabulary - Part 815: Superconductivity
IEC 61788-23:2018 history
0000 IEC 61788-23:2021 RLV
2018IEC 61788-23:2018 Superconductivity - Part 23: Residual resistance ratio measurement - Residual resistance ratio of Nb superconductors