Atomic structure of nanocrystalline metals studied by diffraction techniques and EXAFS
- 31 December 1995
- journal article
- Published by Elsevier BV in Nanostructured Materials
- Vol. 6 (1-4), 105-114
- https://doi.org/10.1016/0965-9773(95)00034-8
Abstract
The relation between the nanometer-scale structure and scattering and EXAFS experimental data is discussed on the basis of the atomic density distribution function. The available experimental information is reviewed, with an emphasis on the model substance Pd. Decreasing the grain-size to the nm-scale induces lattice strains and a modified Debye Waller parameter. Immediately after preparation, the grain boundaries are in a non-equilibrium state, which relaxes to a state with higher atomic short-range order upon aging at room temperature. Strong grain-growth at room temperature indicates a high atomic mobility in the grain boundary regions. Small-angle scattering appears to be dominated by porosity for all but the densest available samples.Keywords
This publication has 13 references indexed in Scilit:
- Alloy thermodynamics in nanostructuresJournal of Materials Research, 1994
- Alloy effects in nanostructuresNanostructured Materials, 1993
- The thermal properties of nanocrystalline Pd from 16 to 300 KPhilosophical Magazine Part B, 1992
- Secondary recrystallization effects in nanostructured elemental metalsScripta Metallurgica et Materialia, 1992
- Calorimetric measurements of the thermal relaxation in nanocrystalline platinumJournal of Applied Physics, 1992
- Characterization of nanocrystalline Pd by x-ray diffraction and EXAFSNanostructured Materials, 1992
- Structural characterization of nanometer-sized crystalline Pd by x-ray-diffraction techniquesPhysical Review B, 1991
- Exafs studies of nanocrystalline materials exhibiting a new solid state structure with randomly arranged atomsPhysics Letters A, 1989
- Computer simulation of normal grain growth in three dimensionsPhilosophical Magazine Part B, 1989
- X-ray diffraction studies of the structure of nanometer-sized crystalline materialsPhysical Review B, 1987