Low temperature crystal structure of Ni-Mn-Ga alloys

B. Wedel, M. Suzuki, Y. Murakami, C. Wedel, T. Suzuki, D. Shindo, K. Itagaki

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Abstract

Transmission electron microscope (TEM) observation at room temperature of the low temperature phase of Ni2.14Mn0.86Ga shows stress-induced 5 periodicity modulation along a pseudo-[111] cubic zone axis. On cooling to 173 K, the periodicity changes to 7. In stress-free areas, a [001] zone axis with new lattice parameters for the tetragonal phase was observed. The new lattice parameters are smaller by a factor of √ 2 than the expected lattice parameters. A new model for the tetragonal compound Ni2MnGa and the non-stoichiometric phases was developed with the help of TEM data, X-ray powder diffraction measurements, and a computational simulation based on the X-ray powder diffraction patterns.

Original languageEnglish
Pages (from-to)137-142
Number of pages6
JournalJournal of Alloys and Compounds
Volume290
Issue number1-2
DOIs
Publication statusPublished - Jan 1 1999
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Wedel, B., Suzuki, M., Murakami, Y., Wedel, C., Suzuki, T., Shindo, D., & Itagaki, K. (1999). Low temperature crystal structure of Ni-Mn-Ga alloys. Journal of Alloys and Compounds, 290(1-2), 137-142. https://doi.org/10.1016/S0925-8388(99)00198-X