The atomic mechanism of the body-centred cubic to σ-phase transformation. Corrections

The following corrections should be made in the article (Kitchingman, 1968) published under the above title: Fig.7, page 286: In the section labelled ATOM in the table, position C should be shown as occupied by Nb and position D by Al, in the second column. Page 285, column 2, lines 20–25 should read: Similarly in the case of 2NbAl incompatibility occurs in the replacement C→D and B→D, since aluminium atoms of coordination number 12 must be replaced by niobium atoms of coordination numbers 14 and 15. Aluminium shows only coordination number 12 and niobium coordination numbers 14 and 15 in the structure.