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Title: Structural and Dynamical Fluctuations in Off-Stoichiometric NiMnGa Shape-Memory Alloys

3D diffuse scattering dataset in the temperature region of the existence of high temperature cubic L21 phase reveals localized intensity maxima related to phason modes. Peierls instability induced tetragonal distortions in the pre-martensitic phase cause strong diffuse scattering. Around (H0H) reflections diffuse scattering is strongly compressed along the [H0H] and enhanced along the [-H0H] direction.
 [1] ;  [1] ;  [2] ;  [1]
  1. ORNL
  2. University of Illinois, Urbana-Champaign
Publication Date:
OSTI Identifier:
DOE Contract Number:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 24
Research Org:
Oak Ridge National Laboratory (ORNL)
Sponsoring Org:
ORNL LDRD Seed-Money
Country of Publication:
United States
shape memory alloys; diffuse scattering