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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 + l1θscoth(θs/T), with θs = 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 β − 90° ∝ (Tc − T)1/4, consistent with a tricritical transition occurring at Tc ≃ 690 K.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 62| Part 1| January 2006| Pages 60-67
doi:10.1107/S0108768105041066
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