Deviations from additivity of lattice spacings in transition metal alloy systems

Abstract

Abstract Using published lattice spacing/composition curves, deviations Δa from additivity of lattice spacings have been calculated for solid solutions in the metals of groups IVA, VA and VIA of the periodic table of transition metals of group numbers 4 to 11 from the three long periods. The results are presented as typical diagrams. Where the components have the same group number, Δa is zero unless one component is from the first long period, when Δa is positive. In such cases the Δa/composition curves are similar in form. Pairs of systems involving a common component also frequently correspond with similar Δa/composition curves. For solvents of group VIA of the periodic table solutes of lower and higher group number give negative and positive Δa values, respectively. This regularity is less marked for group VA solvents, and lost for group IVA solvents, for solid solutions in which Δa is predominantly negative. The results are discussed, and it is suggested that they are consistent with the operation of ...