Thermoelastic properties of magnesiowüstite, (Mg1−xFex)O: determination of the Anderson–Grüneisen parameter by time-of-flight neutron powder diffraction at simultaneous high pressures and temperatures

Wood, I.G.; Vočadlo, L.; Dobson, D.P.; Price, G.D.; Fortes, A.D.; Cooper, F.J.; Neale, J.W.; Walker, A.M.; Marshall, W.G.; Tucker, M.G.; Francis, D.J.; Stone, H.J.; McCammon, C.A.

doi:10.1107/S0021889808025417

Figure 2
(a) Neutron powder diffraction pattern from (Mg_0.8Fe_0.2)O at 390 K and 4.92 GPa [data collected using the pressure cell as described by Le Godec et al. (2001

); see Fig. 1

(a)]. Observed data are shown as points, with the calculated pattern from the Rietveld refinement as a continuous line. The uppermost set of reflection markers are for Fe, the lower set for (Mg_0.8Fe_0.2)O. The very weak peak at about 2.3 Å is from the Ta foil used to measure the sample temperature; the small feature between the reflections from Fe and (Mg_0.8Fe_0.2)O at about 2.05 Å is residual γ-iron/iron carbide (for details see text). (b) Neutron powder diffraction pattern from (Mg_0.7Fe_0.3)O at 621 K and 9.82 GPa [data collected using the pressure cell with toroidal gaskets; see Fig. 1

(b)]. Symbols are as described for (a), but with an additional (uppermost) set of reflection markers for ZrO₂. The additional `background', from the ZrO₂ gasket material, was seen at all pressures and temperatures and is especially noticeable for 1.5 < d < 2.0 Å (note, however, that an incident beam collimator that was larger than optimal was used when collecting these data).

JOURNAL OF
APPLIED
CRYSTALLOGRAPHY

ISSN: 1600-5767

Volume 41| Part 5| September 2008| Pages 886-896

doi:10.1107/S0021889808025417

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