Lattice changes, due to Ti diffusion into monocrystals, were characterized by means of double crystal rocking curve measurements using the (220)hex, (226)hex and (00¯1¯2)hex reflections. The narrow full widths at half-maxima of these reflections, at low Ti concentrations, indicated a high degree of lattice uniformity in spite of an appreciable intrinsic defect density. The a lattice parameter varied bilinearly with the Ti concentration, while the c lattice parameter variation was almost zero. This result was consistent with the existence of a concentration-dependent Ti site. A break in the bilinear function of the a lattice parameter occurred between Ti concentrations of 3 and 6% of the Li or Nb lattice sites. This strongly suggested that Ti, below a concentration of 6%, replaced the Nb which was located in about 6% of the Li sites of the congruent material.

P.Skeath, S.B.Qadri, F.A.Stevie: Journal of Alloys and Compounds, 1993, 191[1], 15-9