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M Ellner – One of the best experts on this subject based on the ideXlab platform.

  • Crystal chemical investigation of the solid solutions of antimony and bismuth in palladium and platinum
    Journal of Alloys and Compounds, 2006
    Co-Authors: M Ellner

    Abstract:

    Abstract Unit cell parameters were measured for the solid solutions Pd(Sb), Pd(Bi) and Pt(Sb) in the whole range of homogeneity. The composition dependence of the average Atomic Volume was investigated for the binary systems Pd–Sb and Pd–Bi. For the solid solutions Pd(Sb) and Pd(Bi), the partial Atomic Volumes of antimony and bismuth were determined. They are compared with the partial Atomic Volumes of the 4d (Ag⋯Te) and 5d (Au⋯Pb) elements measured in the palladium-based solid solutions. The increase in the partial Atomic Volume for the 4d elements Ag and Sb amounts to 16.3%, for the analogous heavy elements Au and Bi to 26.1%.

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  • partial Atomic Volume and partial molar enthalpy of formation of the 3d metals in the palladium based solid solutions
    Metallurgical and Materials Transactions A-physical Metallurgy and Materials Science, 2004
    Co-Authors: M Ellner

    Abstract:

    The composition dependence of the average Atomic Volume, as well as of the enthalpy of formation, was investigated for the palladium-containing binary systems with the 3d metals. The partial Atomic Volume and the partial molar enthalpy of formation of the 3d metals were determined for the palladium-based solid solutions (Pearson symbol cF4, space group \(Fm\bar 3m\), Cu type). The 3d early transition metals (scandium, titanium, and vanadium) as well as the 3d104s2 … 3d104s24p metals (zinc and gallium) show (1) the partial Atomic Volume for the palladium-based solid solutions smaller than is their Atomic Volume in the nonbonded state and (2) significantly large (negative) values of the partial molar enthalpy of formation indicating a strong bond energy between atoms of palladium and those of the 3d early transition metals (as well as a strong bond energy between atoms of palladium and zinc or gallium atoms). The 3d late transition metals (and chromium) show (1) the partial Atomic Volume for the palladium-based solid solutions larger than is their Atomic Volume in the nonbonded state and (2) low (negative) values of the partial molar enthalpy of formation indicating weak bond energy between atoms of palladium and those of the 3d late transition metals.

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  • Partial Atomic Volume of Early Transition Metals in A10 Metal-Based Solid Solutions
    Zeitschrift für Metallkunde, 2004
    Co-Authors: M Ellner

    Abstract:

    Unit-cell parameters were measured for the A 10 metal-based (= Ni, Pd, Pt) solid solutions (Pearson symbol cF4, space group Fm3m, Cu type) with the A 5 transition metals (V, Nb, Ta) in the whole range of homogeneity. Composition dependence both of the average Atomic Volume and the enthalpy of formation were investigated for the A 10 metal-based solid solutions with the A 5 and A 6 transition metals; the partial Atomic Volume and the partial molar enthalpy of formation of the A 5 and A 6 transition were determined for the A 10 -rich terminal phases. Among the systems investigated, only the solid solutions Pd(Cr) and Pt(Cr) show partial Atomic Volume of chromium larger than the chromium Atomic Volume. In the nickel-based solid solution, the partial Atomic Volume of chromium is equal to the chromium Atomic Volume. The partial molar enthalpy of formation for the A 5 transition metals – in the nickel, palladium and platinum-rich alloys – shows larger negative values than values evaluated for the A 6 transition metals. An enlarged investigation of the data available in literature shows that both the relative Volume change, resulting from the dissolving process of the early transition metals in the A 10 metal-based alloys, and the negative values of the partial molar enthalpy of formation increase with decreasing number of the 3d and 4d electrons of the early transition elements. For the 5d quasihomologous transition metals, this observation is valid for the A 4 … A 6 elements as well.

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Tomasz Czujko – One of the best experts on this subject based on the ideXlab platform.

  • the effect of Atomic Volume on the hydrogen storage capacity of hexagonal metals intermetallics
    Scripta Materialia, 2002
    Co-Authors: Robert A. Varin, Tomasz Czujko

    Abstract:

    Abstract A detailed analysis of a large number of data on the gravimetric hydrogen (H) capacity of hexagonal metals and intermetallic alloys shows that their maximum gravimetric hydrogen capacity increases linearly with increasing Atomic Volume, starting from some threshold value of about 120×10 −4 nm 3 /atom.

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  • The effect of Atomic Volume on the hydrogen storage capacity of hexagonal metals/intermetallics
    Scripta Materialia, 2002
    Co-Authors: Robert A. Varin, Tomasz Czujko

    Abstract:

    Abstract A detailed analysis of a large number of data on the gravimetric hydrogen (H) capacity of hexagonal metals and intermetallic alloys shows that their maximum gravimetric hydrogen capacity increases linearly with increasing Atomic Volume, starting from some threshold value of about 120×10 −4 nm 3 /atom.

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Robert A. Varin – One of the best experts on this subject based on the ideXlab platform.

  • the effect of Atomic Volume on the hydrogen storage capacity of hexagonal metals intermetallics
    Scripta Materialia, 2002
    Co-Authors: Robert A. Varin, Tomasz Czujko

    Abstract:

    Abstract A detailed analysis of a large number of data on the gravimetric hydrogen (H) capacity of hexagonal metals and intermetallic alloys shows that their maximum gravimetric hydrogen capacity increases linearly with increasing Atomic Volume, starting from some threshold value of about 120×10 −4 nm 3 /atom.

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  • The effect of Atomic Volume on the hydrogen storage capacity of hexagonal metals/intermetallics
    Scripta Materialia, 2002
    Co-Authors: Robert A. Varin, Tomasz Czujko

    Abstract:

    Abstract A detailed analysis of a large number of data on the gravimetric hydrogen (H) capacity of hexagonal metals and intermetallic alloys shows that their maximum gravimetric hydrogen capacity increases linearly with increasing Atomic Volume, starting from some threshold value of about 120×10 −4 nm 3 /atom.

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