Superconducting Metastable Compounds

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Science  07 Aug 1964:
Vol. 145, Issue 3632, pp. 581-583
DOI: 10.1126/science.145.3632.581


A number of metastable phases, germanides and tellurides of gold and silver, have been prepared, analyzed by x-ray diffraction, and investigated for superconductivity. The new superconductors and their transition temperatures are AgTe3 (2.6°K), Ag4Ge (0.85°K), Au3Te5 (1.62°K), and Au1-xGex (0.99°K-1.63°K) where (0.27 ≤ x ≤ 0.60). Au-Ge compositions with other values of x do not superconduct above 0.32°K.