Ordering and dynamics of the central tetrahedron in the 1/1 Zn6Sc periodic approximant to quasicrystal

Ordering and dynamics of the central tetrahedron in the 1/1 Zn6Sc periodic approximant to quasicrystal
复制标题

1/1 Zn6Sc 周期近似准晶中中心四面体的有序性和动力学

DOI:
10.1088/0953-8984/24/41/415403
复制
发表时间:
2012
期刊:
Journal of Physics: Condensed Matter
影响因子:
--
通讯作者:
M. Boissieu
M. Boissieu
中科院分区:
--
文献类型:
--
作者:
H. Euchner;Tsunetomo Yamada;H. Schober;S. Rols;M. Mihalkovič;R. Tamura;T. Ishimasa;M. Boissieu

文献摘要

参考文献

被引文献

相似文献

准晶的周期性近似为更好地理解准晶的结构、物理性质和稳定机制提供了一个独特的机会。我们详细地研究了在约160K发生的有序-无序相变,该相变发生在与二十面体准晶I-MgZnSc近似的立方相中。这种转变伴随着位于bcc晶格上的大原子团中心的四面体的反平行有序。单晶X射线漫反射表明,四面体在T_c以上显示出过渡前的短程有序性(Yamada等人,2012年正在准备)。利用准弹性中子散射(QENS),我们清楚地证明了这种短程有序在T_c以上具有动力学性质。QENS的数据与分子动力学模拟支持的四面体在几乎相等的位置之间跳跃的模型是一致的。这表明,即使在室温下,Zn6Sc结构也具有独特的动态柔性。
Periodic approximants to quasicrystals offer a unique opportunity to better understand the structure, physical properties and stabilizing mechanisms of their quasicrystal counterparts. We present a detailed study of the order–disorder phase transition occurring at about 160 K in the Zn6Sc cubic approximant to the icosahedral quasicrystal i-MgZnSc. This transition goes along with an anti-parallel ordering of the tetrahedra located at the centres of large atomic clusters, which are packed on a bcc lattice. Single crystal x-ray diffuse scattering shows that the tetrahedra display pre-transitional short range ordering above Tc (Yamada et al 2012 in preparation). Using quasielastic neutron scattering (QENS) we clearly evidence this short range order to be dynamical in nature above Tc. The QENS data are consistent with a model of tetrahedra ‘jumping’ between almost equivalent positions, which is supported by molecular dynamics simulations. This demonstrates a unique dynamical flexibility of the Zn6Sc structure even at room temperature.
DOI: --
发表时间: 2010
期刊: Phys. Rev. B 82
影响因子: --
作者:
T.Yamada;R.Tamura;Y.Muro;K.Motoya;M.Isobe;Y.Ueda.
通讯作者: Y.Ueda.
DOI: --
发表时间: 2007
期刊: Phil. Mag. (印刷中)
影响因子: --
作者:
T.Ishimasa;Y.Kasano;A.Tachibana;S.Kashimoto;T.Ishimasa
通讯作者: T.Ishimasa
DOI: --
发表时间: 2005
期刊: Physical Review B 72
影响因子: --
作者:
R.Tamura;K.Edagawa;K.Shibata;K.Nishimoto;S.Takeuchi;K.Saitoh;M.Isobe;Y.Ueda
通讯作者: Y.Ueda
DOI: --
发表时间: 2010
期刊: Physical Review B
影响因子: 3.7
作者:
NARIKAWA;Takahiro;山田庸公
通讯作者: 山田庸公