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X-ray Diffuse Scattering in “Premartensitic Phase” of A–15 Compounds

The origin of “premartensitic state” of Nb3Sn with A–15 type structure has been investigated by x-ray diffraction technique. The diffuse scattering along the [112̄] direction around the (666) reflection has been found above Tm (martensitic transformation temperature) and develops with lowering temperature to Tm. The origin of the diffuse scattering is associated with “tweed pattern” observed by electron microscopy.