Alternative Transformation Behavior in Sulfides: Direct Observations by Transmission Electron Microscopy

See allHide authors and affiliations

Science  30 Jul 1976:
Vol. 193, Issue 4251, pp. 417-418
DOI: 10.1126/science.193.4251.417


Structural phase transformations in Ni7S6 and Cu7S4 have been observed dynamically by in situ experiments in a transmission electron microscope. In this way it is possible to demonstrate the possibility of two fundamentally different types of behavior: (i) the ideal transformation from the stable high-temperature form to the stable low-temperature form and vice versa and (ii) alternative metastable processes which operate when the formation of the low-temperature state is impeded.