Towards a better understanding of the structure of nano-minerals at ambient and extreme conditions
- Stony Brook University, Department of Geosciences and Mineral Physics Institute (United States)
- X-ray Science Division, Argonne National Laboratory, Argonne IL 60439 (United States)
The high-pressure (HP) behavior of nano-crystalline mackinawite (n-FeS) with particle sizes of 6, 7, and 8 nm has been investigated by high-energy X-ray total scattering and pair distribution function analysis. An irreversible first-order structural phase transition from tetragonal mackinawite to orthorhombic FeS-II was observed at about 3 GPa. The transition is induced by the closure of the van-der-Waals gap in the layered mackinawite structure. A grain size effect on the transition pressure and the compressibility was observed. The n-FcS study is an example of a broad class of nano-crystalline minerals where the total scattering (TS) approach provides significant new information on local-, intermediate- and long-range structure. Under extreme conditions, of pressure in this case, straightforward modifications allow quantitative descriptions of the transformations mechanisms.
- OSTI ID:
- 21260233
- Journal Information:
- AIP Conference Proceedings, Vol. 1092, Issue 1; Conference: 6. international conference on synchrotron radiation in materials science, Campinas (Brazil), 20-23 Jul 2008; Other Information: DOI: 10.1063/1.3086231; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
Similar Records
Understanding the breathing phenomena in nano-ZIF-7 upon gas adsorption
Toward an Understanding of Surface Layer Formation, Growth, and Transformation at the Glass–Fluid Interface