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首页> 外文会议>Symposium on Quasicrystals held November 30-December 2,1998,Boston,Massachusetts,U.S.A. >Thermal expansion and gruneisen parameters of quasicrystals
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Thermal expansion and gruneisen parameters of quasicrystals

机译：准晶体的热膨胀和格氏指数

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摘要

To investigate anharmonic phonon properties,thermal expansion measurements have been performaed for icosahedral (i-)Al-Pd-Mn and decagonal (d-) Al-Cu-Co quasicrystals by X-ray diffractometry in the temeprature range between 100 and 800 K.the linear thermal expansion coefficient #alpha#(T) of i-Al-Pd-Mn is 1.1 x 10~-5K~-1 at 300 K,which is about a half of that of pure Al phase.The measured #alpha#(T) of a-Al-Cu-Co coincides almost completely with that of i-Al-Pd-Mn and no appreciable anisotropy was detected between the tenfold periodic direction and a quasiperiodic direction perpendicular to it.the Gruneisen parameter #gamma#(T),has been evaluated from the measured #alpha#(T) usifng hte data of lattice specific heat and elastic moduli previously reported.The #gamma#(T) values for the two phases are ocmparable to those for conventional metallic crystals and almost constant over the temeprature range studied.
机译：为了研究非谐声子的性质，已通过X射线衍射法在100至800 K的温度范围内对二十面体（i-）Al-Pd-Mn和十边形（d-）Al-Cu-Co准晶体进行了热膨胀测量。 i-Al-Pd-Mn的线性热膨胀系数＃alpha＃（T）在300 K下为1.1 x 10〜-5K〜-1，约为纯Al相的一半。 a-Al-Cu-Co的（T）与i-Al-Pd-Mn几乎完全重合，并且在十倍周期方向和与其垂直的准周期方向之间未检测到明显的各向异性.Gruneisen参数＃gamma＃（ T）是根据先前报道的晶格比热和弹性模量的测得的＃alpha＃（T）数据进行评估的。两相的＃gamma＃（T）值与常规金属晶体的值几乎无可比拟，几乎在所研究的温度范围内保持恒定。

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