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Science 30 July 1976:
Vol. 193. no. 4251, pp. 417 - 418
DOI: 10.1126/science.193.4251.417
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Articles

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

A. PUTNIS 1

1 Department of Mineralogy and Petrology, University of Cambridge, Cambridge CB2 3EW, England

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.

Submitted on March 5, 1976
Accepted on April 28, 1976

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Science. ISSN 0036-8075 (print), 1095-9203 (online)