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Relation between incommensurate satellites and phonon softening in Ti-Ni-based shape memory alloys

机译:Ti-Ni基形状记忆合金中不相称卫星与声子软化的关系

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摘要

In Ti-44.0 Ni-6.0 Fe alloy, diffuse satellites appear at incommensurate positions given by g_(B2) + q when the zone axis is [1 1 1] or [0 0 1], but not [1 1 0]. This result implies that the satellites appear because of a transverse wave consistent with the displacement of atoms in the (1 1 0) direction, which is perpendicular to the propagation vector q = {ξ ξ 0}, for ξ ~ 1/3. This transverse wave occurs as a result of the phonon softening of the TA_2 branch.
机译:在Ti-44.0 Ni-6.0 Fe合金中,当区域轴为[1 1 1]或[0 0 1]而不是[1 1 0]时,扩散卫星出现在g_(B2)+ q给出的不适当位置。该结果表明,出现卫星的原因是横波与原子在(1 1 0)方向上的位移一致,垂直于传播矢量q = {ξξ0},且ξ〜1/3。该横向波是TA_2分支的声子软化的结果。

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