Quenching and recovery experiments on molybdenum

Abstract

Abstract Quenching experiments in superfluid helium have been performed on high-purity wire specimens obtained from a Mo single crystal with a residual resistance ratio of 40 000. Quenching from various temperatures near the melting point to 1·5 K resulted in quenched-in resistivities which are interpreted in terms of quenched-in vacancies. The following parameters were derived: H 1v F=3·2eV (formation enthalpy of monovacancies) and S 1v F=1·5 k (formation entropy). The recovery of the quenched-in resistivity showed a recovery stage at 520 K, which is compatible with a migration enthalpy of H 1v M=1·35 eV. The results are compared with recently published positron annihilation data.