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
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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
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发表时间:
2012
期刊:
影响因子:
--
通讯作者:
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
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.
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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
影响因子:
3.7
作者:
NARIKAWA;Takahiro;山田庸公
通讯作者:
山田庸公