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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.
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Category :
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.
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Category :
Languages : en
Pages : 11
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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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Category : Aeronautics
Languages : en
Pages : 328
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Author: Ph Komninou
Publisher:
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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 : Power resources
Languages : en
Pages : 754
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Author: C. Suryanarayana
Publisher: Minerals, Metals, & Materials Society
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 520
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This volume records the proceedings of the International Symposium on Processing and Properties of Nanocrystalline Materials held at Materials Week '95 in Cleveland, Ohio, October 29-November 2, 1995. It contains a stale-of-the-art review of various aspects of nanocrystalline materials, including fundamentals, synthesis/processing, characterization, consolidation, mechanical properties, magnetic properties, and applications.
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Category :
Languages : en
Pages : 7
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Category : Science
Languages : en
Pages : 1528
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Author:
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ISBN:
Category : Government reports announcements & index
Languages : en
Pages : 1450
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