【摘要】 本文报道一个新Ａｌ－Ｃｕ相具有正交结构，空间群Ｆｄｄｄ．点阵常数为：ａ＝０．８１６６ｎｍ，ｂ＝０．９９９５ｎｍ，ｃ＝１．４１４９ｎｍ，表达式为Ａｌ４３．２Ｃｕ５６．８．该相与Ａｌ－Ｃｕ－Ｆｅ准晶的价电子浓度相同，是一个由ＣｓＣｌ结构衍生的类似相．更多还原

【Abstract】 he present paper reports a new quasicrystal-related Al43.2Cu56.8 phase. It has an orthorhombic structure with space group Fddd and lattice parameters a=0.8166 nm,b=0.9995 nm,c= 1.4149 nm. Note that their parameters satisfy the relative ratios of a:b:c=1:. Its valence electron concentration per atom is equal to that of the Al-Cu-Fe quasicrystal so that is considered as an approximant of the latter. It is often in 3-fold twinning form with twinning axis POinting towards the [010] direction. This evidence, plus some parameter coincidences, indicate that it may be a decomposition product of the high-temperature ε2-A12Cu3 phase with hexagonal symmetry. The orientation relationship with the basic CsCl structure is also pointed out.更多还原