TY - JOUR
T1 - Low temperature crystal structure of Ni-Mn-Ga alloys
AU - Wedel, B.
AU - Suzuki, M.
AU - Murakami, Y.
AU - Wedel, C.
AU - Suzuki, T.
AU - Shindo, D.
AU - Itagaki, K.
N1 - Funding Information:
The generous support of a foundation donated by the Japanese Ministry of Education is gratefully acknowledged. Special thanks are given to Dr. Z. Wang for a discussion of the material preparation problems, Dr. C.M. Young for TEM discussions and Dr. S. Ritsch for the preparation of the TEM photographs.
PY - 1999
Y1 - 1999
N2 - 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.
AB - 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.
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U2 - 10.1016/S0925-8388(99)00198-X
DO - 10.1016/S0925-8388(99)00198-X
M3 - Article
AN - SCOPUS:0032690409
VL - 290
SP - 137
EP - 142
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
SN - 0925-8388
IS - 1-2
ER -