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Figure 8
Symmetry-adapted strains calculated from lattice parameters for MgxCu1 − xCr2O4 with x = 0, 0.10, 0.18, 0.46. (a) The symmetry-adapted tetragonal strains follow the classical pattern of a first-order phase transition driven by a single-order parameter. (b) Volume strain, Vs, data have been fit with standard solutions to a Landau expansion assuming that Vs scales with the square of the order parameter. On this basis the transition is first order in character at x = 0, 0.10, 0.18 and second order at x = 0.46. (c) Strain–strain relationships: tetragonal strains and volume strains vary linearly with each other at each composition and, within experimental uncertainty, extrapolate to the origin. Same symbols as for Fig. 6[link].

IUCrJ
Volume 3| Part 5| September 2016| Pages 354-366
ISSN: 2052-2525
doi:10.1107/S2052252516012574