Lattice dynamics of the high-temperature shape-memory alloy NbRu

S. M. Shapiro, G. Xu, G. Gu, J. Gardner, and R. W. Fonda
Phys. Rev. B 73, 214114 – Published 23 June 2006

Abstract

NbRu is a high-temperature shape-memory alloy that undergoes a martensitic transformation from a parent cubic β-phase into a tetragonal β phase at TM900°C. Measurements of the phonon dispersion curves on a single crystal show that the [110]-TA2 phonon branch, corresponding in the q=0 limit to the elastic constant C=12(C11C12) 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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  • Received 1 March 2006

DOI:https://doi.org/10.1103/PhysRevB.73.214114

©2006 American Physical Society

Authors & Affiliations

S. M. Shapiro1, G. Xu1, G. Gu1, J. Gardner1,2, and R. W. Fonda3

  • 1Brookhaven National Laboratory, Condensed Matter Physics/Materials Science Department, Upton, New York 11973, USA
  • 2NIST Center for Neutron Research, 100 Bureau Drive, MS8562, Gaithersburg, Maryland 20899-8562, USA
  • 3Materials Science and Technology Division, Naval Research Laboratory Code 6356, Washington, D.C. 20375, USA

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Issue

Vol. 73, Iss. 21 — 1 June 2006

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