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Figure 5
Strain ellipsoid of the thermal expansion between (Ia) and (Ib). The strain ellipsoid is defined by the equation X12/(1+α1ΔT)2 + X22/(1+α2ΔT)2 + X32/(1+α3ΔT)2 = 1 (Küppers, 2003BB12). View along the crystallographic b axis (same perspective as in Fig. 1[link]). Shown in grey (red in the electronic version of the paper) is the deviation (greatly exaggerated) from isotropic behaviour (black). The corresponding eigenvalues α of the strain tensor are 253.9 (19.56° to a), −38.3 (27.51° to c) and −51.1 (parallel to b) 10 −6 K−1.

Journal logoSTRUCTURAL
CHEMISTRY
ISSN: 2053-2296
Volume 65| Part 2| January 2009| Pages m69-m74
doi:10.1107/S0108270108043242
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