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aInstitute of Applied Physics, University of Tsukuba,
Tukuba 305, Japan
bInstitute for Solid State Physics, University of Tokyo, Roppongi,
Minatoku, Tokyo 106, Japan
Trans .Mat. Res. Soc. Jpn., Vol.18B, pp827-830 (1994).
The martensitic transformation in sodium was studied by means of neutron scattering. The clear indication of the presence of the incubation time for the nucleation process of the martensitic phase has been obtained. This indicates that the nucleation process of the martensite in sodium is a thermally activated process at constant temperature, i.e., isothermal process. We are strongly inclined to propose that the martensitic trasformation in sodium which has appeared as an athermal one has been caused either by the presence of lattice defects or the cooling rate which has not been sufficiently slow.
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