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首页> 外文期刊>Philosophical Magazine Letters >Phonon-phason coupling in a Mg-Ga-Al-Zn icosahedral quasicrystal
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Phonon-phason coupling in a Mg-Ga-Al-Zn icosahedral quasicrystal

机译:Mg-Ga-Al-Zn二十面体准晶体中的声子-声子耦合

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摘要

Precise X-ray diffraction measurements have revealed that phonon (conventional) strain is introduced at the phase transition from an icosahedral quasicrystal to its orthorhombic crystal approximant in a Mg-Ga-Al-Zn alloy. From the magnitude of the measured phonon strain, the phonon-phason coupling constant has been evaluated. This constant is approximately - 0.03 mu (mu: shear modulus) and it is in good agreement with the result of a theoretical calculation reported previously (W.-J. Zhu and C.L. Henley, Europhys. Lett. 46 748 (1999)). This is the first study that experimentally evaluates the phonon-phason coupling constant in any existing quasicrystalline phase.
机译:精确的X射线衍射测量表明,在Mg-Ga-Al-Zn合金中,从二十面体准晶体到其正交晶体的近似相变,会引入声子(常规)应变。从测得的声子应变的大小,已经评估了声子-声子耦合常数。该常数约为-0.03μm(μ:剪切模量),并且与先前报道的理论计算的结果(W.-J.Zhu and C.L.Henley,Europhys.Lett.46748(1999))非常吻合。这是第一项通过实验评估任何现有准晶相中的声子-声子耦合常数的研究。

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