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Abstract
X-ray diffraction with synchrotron radiation has been used for the first time to study chemical interaction in the FeO–ZnO system at 4.8 GPa and temperatures up to 1300 K. Above 750 K, the chemical reaction between FeO and ZnO has been observed to result in the formation of rock salt (rs) Fe1−x Zn x O solid solutions (0.3≤x≤0.85). The lattice parameters of these solid solutions have been measured in situ as a function of temperature under pressure, and corresponding thermal expansion coefficients have been calculated.
Acknowledgements
We thank Dr V.Z. Turkevich for his stimulating discussions. Experiments have been performed during beamtime allocated to the Project I-20070033 EC at HASYLAB-DESY and have received funding from the European Community's Seventh Framework Programme (FP7/2007-2013) under grant agreement no. 226716. This work was also supported by the Russian Foundation for Basic Research (Project No. 
). P.S.S. is grateful to the French Ministry of Foreign Affairs for financial support (BGF fellowship no. 2007 1572).
Notes
(), where γ is the concentration of turbostratic stacking faults Citation9.
At 4.8 GPa and 1200 K, the lattice parameters of FeO and Fe0.5Zn0.5O solid solution are 4.315(6) and 4.307(2) Å, respectively.
For rs-Fe0.7Zn0.3O an abrupt (more than by one order of magnitude) increase in intensity of 220 reflection is observed, while 331 and 400 reflections disappear almost completely; for Fe0.3Zn0.7O, 400 and 420 reflection intensities increase twice, and the intensity of 331 reflection decreases. No change in reflection intensities is observed for pristine iron (II) oxide at the same p, T conditions.
Melting point of iron (II) oxide is 1650 K at ambient pressure and ∼1800 K at 5 GPa Citation10.
Average value of the 300–1273 K temperature and 3.2–10.4 GPa pressure domain.