Positron-annihilation studies of stable Al-based icosahedral quasicrystals
Positron-annihilation studies of stable Al-based icosahedral quasicrystals
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稳定铝基二十面体准晶的正电子湮没研究
DOI：
10.1103/physrevb.59.6712
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发表时间：
1999
影响因子：
3.7
通讯作者：
S. Takeuchi
中科院分区：
文献类型：
--
作者：
Kiminori Sato;Y. Takahashi;H. Uchiyama;I. Kanazawa;R. Tamura;K. Kimura;F. Komori;R. Suzuki;T. Ohdaira;S. Takeuchi
测定了Al-Pd-Re合金体系中的正电子湮灭寿命谱，Al 70.7 Pd 21.34 Re 7.96和Al 71.5 Pd 20.3 Mn 8.2合金中的慢变单能正电子束的正电子湮灭多普勒增宽谱，Al 71.5 Pd 20.3 Mn 8.2合金中的正电子湮灭寿命谱。这些测量表明，每个样品都含有密集分布的结构空缺型位点。这一结果与我们先前对团簇中空中心的存在与二十面体准晶体稳定性之间关系的预期一致。此外，Al 70.7 Pd 21.34 Re 7.96和Al 71.5 Pd 20.3 Mn 8.2的二十面体准晶体的结构空位密度分别为7.7× 10 20和5.0× 10 20 cm−3。
The positron-annihilation lifetime spectra in the Al-Pd-Re alloy system, the positron-annihilation Doppler-broadening spectra by slow variable monoenergetic positron beam in Al 70.7 Pd 21.34 Re 7.96 and Al 71.5 Pd 20.3 Mn 8.2 alloys, and positron-annihilation lifetime spectra by slow positron beam in Al 71.5 Pd 20.3 Mn 8.2 were measured. These measurements indicate that every sample contains a dense distribution of structural vacancy-type sites. This result is consistent with our previous expectation of the relationship between the presence of vacant centers in clusters and the stability of icosahedral quasicrystals. Furthermore, the structural vacancy densities in icosahedral quasicrystals of Al 70.7 Pd 21.34 Re 7.96 and Al 71.5 Pd 20.3 Mn 8.2 have been estimated to be 7.7× 10 20 and 5.0× 10 20 cm− 3, respectively.