铝置换诱导的Mg1-xAlxB2（x = 0.0 ~ 0.50）超结构的X射线衍射研究
Aluminium substitution induced superstructures in Mg1-xAlxB2 (x = 0.0 to 0.50): An X-ray diffraction study
摘要：
报道了Mg_（1-x）Al_xB_2（x = 0.0 ~ 0.50）体系的物理性能表征。详细讨论了与相形成、结构转变、电阻率R（T）和磁化强度M（T）测量有关的结果。结果表明，通过Al向MgB_2中加入电子导致超导电性的丧失。还可以看到的是与硼层的崩溃所反映的c参数的连续下降相关联的结构转变。本文的主要重点是慢扫描X射线衍射（XRD）的结果，证实了存在的超结构沿c方向的x = 0.50的样品。一些额外的峰的出现，即[103]，[004]，[104]和[112]，导致沿着c轴的晶格参数加倍。这可能表明在MgAlB 4中Al和Mg被六方硼层隔开但仍保持相同的六方AlB 2型结构的交替有序。
英文摘要：
The physical property characterization of Al doped Mg1-xAlxB2 system with x = 0.0 to 0.50 is reported. The results related to phase formation, structural transition, resistivity R(T) and magnetization M(T) measurements are discussed in detail. It is shown that the addition of electrons to MgB2 through Al results in loss of superconductivity. Also seen is a structural transition associated with the collapse of boron layers reflected by the continuous decrease in the c parameter. The main emphasis in this paper is on slow scan X-ray diffraction (XRD) results, which confirm the existence of a superstructure along the c-direction for the x = 0.50 sample. The appearance of some additional peaks, viz. [103], [004], [104] and [112], results in doubling of the lattice parameter along the c-axis. This possibly indicates the alternative ordering of Al and Mg in MgAlB4 separated by hexagonal boron layers but still maintaining the same hexagonal AlB2 type structure.
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