Substituted systems lattice parameter variation

In the system Mo,Fe3 x04, there is a regular variation with x, from Fe304 to MoFe204, in the lattice parameter (ao), the magnetization (Ms), the Curie temperature (Tc) and the electrical conductivity (a, AH ) apparently substitution of Fe by Mo leads to a mixed iron valence on both sites for 0 < x < 1. It is worth noting that AH varies smoothly with x from a AH < kT for x = 0 in the temperature interval 300 < T < 600 K to 0.027 eV for x = 1.0, where the narrow minority-spin band is maximally perturbed and filled by the introduction of substitutional Mo ... 

The Sc-Nb Si isothermal section at 800"C presented in fig. 61 has been reported by Kotur (1986). Solid solution of substitution Sc5 1.5Nbo-3.5Si3 occurs in the system. The variation of the lattice parameters show negative deviation from Vegard s rule. Other binary scandium and niobium silicides do not dissolve the third component. T vo ternary compounds exist in the system. Probably Sco.4Nb4.6Si3 is a solid solution of the binary... 

Similar calculations were carried out for the single impurity systems, niobium in Cu, vanadium in Cu, cobalt in Cu, titanium in Cu and nickel in Cu. In each of these systems the scattering parameters for the impurity atom (Nb, V, Co, Ti or Ni) were obtained from a self consistent calculation of pure Nb, pure V, pure Co, pure Ti or pure Ni respectively, each one of the impurities assumed on an fee lattice with the pure Cu lattice constant. The intersection between the calculated variation of Q(A) versus A (for each impurity system) with the one describing the charge Qi versus the shift SVi according to eqn.(l) estimates the charge flow from or towards the impurity cell.The results are presented in Table 2 and are compared with those from Ref.lc. A similar approach was also found succesful for the case of a substitutional Cu impurity in a Ni host as shown in Table 2. 

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