Lattice dynamics of the high temperature shape memory alloy Nb-Ru

Details Lattice dynamics of the high temperature shape memory alloy Nb-Ru Lattice dynamics of the high temperature shape memory alloy Nb-Ru

2006-03-01

arxiv.org/abs/cond-mat/0603031v1

Physics

Condensed Matter

Materials Science

Scientific paper

10.1103/PhysRevB.73.214114

Nb-Ru is a high temperature shape memory alloy that undergoes a Martensitic transformation from a parent cubic b-phase into a tetragonal b' phase at TM 900 C. Measurements of the phonon dispersion curves show that the [110]-TA2 phonon branch, corresponding in the q=0 limit to the elastic constant C'=1/2(C11-C12) has an anomalous temperature dependence. Nearly the entire branch softens with decreasing temperature as TM is approached. The temperature dependence of the low-q phonon energies suggests that the elastic constants would approach 0 as T approaches TM, indicating a second order transition. No additional lattice modulation is observed in the cubic phase.

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