| Issue |
Europhys. Lett.
Volume 44, Number 5, December I 1998
|
|
|---|---|---|
| Page(s) | 620 - 626 | |
| Section | Condensed matter: structure, thermal and mechanical properties | |
| DOI | https://doi.org/10.1209/epl/i1998-00563-6 | |
| Published online | 01 September 2002 | |
Enhanced bulk modulus and reduced transition pressure in γ-
nanocrystals
1
Department of Physics, Building 307, Technical University of Denmark, DK-2800 Lyngby, Denmark
2
Niels Bohr Institute, Oersted Laboratory - DK-2100 Copenhagen, Denmark
Received:
5
January
1998
Accepted:
15
October
1998
Synchrotron
radiation X-ray diffraction studies of γ- have been performed with emphasis
on
the pressure-induced phase transformation 
and the equation of state
of the nanophase material. For γ- the bulk
modulus has been found to increase from 203 GPa
for the bulk material to
305 GPa for 9 nm size crystals. At the same time the transition pressure
decreases from 35 to 27 GPa. The reduced transition pressure is explained
in terms of nucleation
and growth, the larger volume change upon transition
in the nanocrystalline material being the main
factor.
PACS: 64.70.Kb – Solid-solid transitions / 68.35.Rh – Phase transitions and critical phenomena / 81.30.-t – Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
© EDP Sciences, 1998
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