67Zn Mössbauer study of Zn metal and Cu−Zn alloys at high pressure

A high pressure Mössbauer spectrometer for the 93.3keV resonance in⁶⁷Zn has been used to investigate Zn metal and two Cu?Zn alloys with Zn concentrations of 41.9at% and 48.0at% at 4.2K and pressures up to ～58kbar. For Zn metal the c/a-ratio plays an important role to describe the change of the Mössbauer parameters with pressure. Most striking is the increase of the recoil-free fraction by a factor of ～3. In the brass alloys a new phase is observed at 4.2K and high pressures which we tentatively identify with a martensitic α₁-phase.