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Figure 5 Lattice parameters for Nd0.7Ti0.9Al0.1O3 as a function of temperature. The dashed curves fitted to the cell edges are of the form l = l0 + l1scoth(s/T), with s = 350 K, to describe the saturation effects at lower temperatures. Extrapolation on a and b suggests the structure would become tetragonal at around 1480 K. The curve fitted to the monoclinic angle is of the form - 90° (Tc - T)1/4, consistent with a tricritical transition occurring at Tc 690 K.

© International Union of Crystallography 2006