Quantum stress on valence electron, named electron stress (σ), in K and Al has been calculated by using pseudopotential method under strict uniaxial strain deformation. Electron pressure (
p) and electron stiffness parameter (
c) have been defined from σ. Though some properties of simple metals are characterized from free electron gas, density of σ showed certain localization, like atomic bond. Changes of distributions on σ and
p were discussed from Bain's bct structure path on fcc/bcc phase transformation. Rapid increases of σ were also observed. These peculiar spatial and quantity changes of σ might imply switching of atomic bond during fcc/bcc phase transformation.
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