Lattice Instability in Cubic Cu_<69.2>Al_<25.4>Ni_<5.4> Related to Martensitic Phase Transition
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概要
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The dispersion relation of [110] TA. phonon (e//[1T0]) of /7.-phase Cub...AIz...Ni 5 .4 was measured extensively at 261, 295 and 372 K by neutron scatteringtechnique. It was found that the dispersion surface of the transverse acousticmode has a pronounced valley along the [110] axis. The temperature dependenceof the phonon energy shows a partial softening of the phonon mode. An anomalousdip of the dispersion curve was observed around q=(2/3)q.... on the [110] axis.Interplaner force-constant analysis revealed that the lattice dynamics of thecrystal indicates dual instabilities both to the 2H and 18R type martensites.Quasielastic scattering was investigated on and in the vicinity of the [110] axis.Peaks attributable to the 2H and 18R martensites were observed as functions oftemperature, which also indicates that 2H and 18R are competing.
- 社団法人日本物理学会の論文
- 1985-08-15
著者
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MORII Yukio
Japan Atomic Energy Research Institute
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Morii Yukio
Advanced Science Research Center Japan Atomic Energy Research Inst.
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Morii Yukio
Japan Atomic Energy Research Inst.
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Morii Yukio
Tokai Establishment Japan Atomic Energy Research Institute
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Morii Yukio
Neutron Scattering Laboratory Japan Atomic Energy Research Institute Tokai
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Morii Yukio
Neutron Scattering Laboratory Japan Atomic Energy Research Insts
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Iizumi Masashi
Japan Atomic Enegy Research Institute
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Morii Yukio
Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki 319-1195, Japan
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