Abstract

ROBINSON 859 very similar, yet the A11 atoms approach unusually close to the Cr atoms, whilst the Al~ atoms remain at a more normal distance. Similar relationships between electron deficiencies and shortened transition metalaluminium interatomie distances have been noted in MnsSiA19 and in MnA16 and in both these cases it has been possible to give more reliable evidence for absorption of electrons into the vacancies in the 3d shells of the transitional metal atoms.