The Synthesis of A15-Type Materials at High Pressures: Comments and Critiques

  • A. W. Webb
  • T. L. Francavilla
  • R. A. Meussner
  • R. M. Waterstrat


Materials with the A15 structure are of interest principally because a number of them are superconductors. Nb3Ge, which has the highest known superconducting transition temperature To, 23.2 K, has this A15 structure [1]. Of 65 known A15 Compounds 41 are superconducting. Figure 1 shows the structure of an A15 unit cell. The B atoms, hatched here, form a body-centered cubic network. Woven through this network are three mutually orthogonal chains of A atoms, shown as stippled here. There is evidence that the integrity of these A chains is important to superconductivity [2]. Figure 2 shows the location of the A and B atoms in the Periodic Table. The A atoms (stippled) are from the Ta, V, and Cr groups, with V and Nb forming 30 of these A15 Compounds. Technetium has been reported acting as the A element in one Compound [3]. The B atoms (hatched) are from the groups of transition metals from Mn through Zn, and the groups of non-transition metals A1, Si and P. Beryllium is included because Mo3Be has been reported to form with the Al5 structure [4]. Nb3Te has been formed by high pressure, high temperature techniques [5].


Boron Nitride Elemental Powder Nitride Reaction Molybdenum Sheet High Temperature Technique 
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Copyright information

© Springer Science+Business Media New York 1979

Authors and Affiliations

  • A. W. Webb
    • 1
  • T. L. Francavilla
    • 1
  • R. A. Meussner
    • 1
  • R. M. Waterstrat
    • 2
  1. 1.Naval Research LaboratoryUSA
  2. 2.National Bureau of StandardsUSA

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