Diffraction Studies of the Thermal Properties of Nanocrystalline Pd and Cr PDF Download
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Languages : en
Pages : 7
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Author:
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Languages : en
Pages : 7
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Author:
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Category :
Languages : en
Pages : 7
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Quantitative X-ray and neutron diffraction measurements were made on nanocrystalline and coarse-grained samples of Pd and Cr. For both materials, Debye-Waller parameter comparisons over a temperature range of approximately 20-300 K indicate that the nanocrystalline materials have increased static displacements of atoms from their equilibrium sites compared to coarse-grained material. No grain-size-correlated differences in thermal vibrational amplitude, lattice parameter, or thermal expansion coefficients were observed in either material. In contrast to earlier results on nanocrystalline Pd, significantly more non-peak intensity is observed from a nanocrystalline Cr sample than from a coarse-grained Cr sample. Impurities may account for the increased background intensity from nanocrystalline Cr. These results indicate that there is no significant grain boundary excess volume in nanocrystalline Pd, and therefore the reduced density typically observed in nanocrystalline Pd samples must be due to porosity.
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Languages : en
Pages : 11
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Comparisons of diffraction data from nanocrystalline and coarse-grained Pd samples indicate that grain boundaries in nanocrystalline Pd are reasonably ordered. Lattice parameter measurements show no significant grain boundary excess volume in nanocrystalline Pd, and therefore the reduced density typically observed in nanocrystalline Pd samples must be due to porosity. The lack of any significant change in both thermal expansion coefficients and average atomic vibrational amplitudes may indicate that rigid-body motions normal to grain boundaries in nanocrystalline Pd are severely constrained. Nanocrystalline Cr shows many similarities in behavior with nanocrystalline Pd, except that significantly more non-peak intensity is observed from a nanocrystalline Cr samples than from a coarse-grained Cr sample. Impurities may account for this behavior.
Author: Aleksandr Ivanovich Gusev
Publisher: Cambridge Int Science Publishing
ISBN: 1898326266
Category : Technology & Engineering
Languages : en
Pages : 365
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In the monograph, the first of this type in the world, the authors discuss systematically the current state of investigations into nanocrystalline materials. The experimental results on the effect of the nanocrystalline state on the microstructure and the mechanical, thermophysical, optical, and magnetic properties of metals, alloys and solid-phase compounds are generalised. Special attention is given to the main methods of production of isolated nanoparticles, ultrafine powders and dense nanocrystalline materials. The dimensional effects in isolated nanoparticles and high-density nanocrystalline materials are discussed in detail, and the important role of the interface in the formation of the structure and properties of dense nanocrystalline materials is shown. The modelling considerations, explaining special features of the structure and anomalous properties of substances in the nanocrystalline condition, are analysed.
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Category : Aeronautics
Languages : en
Pages : 702
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Category : Power resources
Languages : en
Pages : 654
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Author: Ph Komninou
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Category : Technology & Engineering
Languages : en
Pages : 890
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The review and research papers presented in this volume may be subdivided into three aims:
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Category : Physics
Languages : en
Pages : 1162
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Category :
Languages : en
Pages : 11
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Category : Electronic journals
Languages : en
Pages : 390
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