High pressure synthesis of LiMeO₂–ZnO (Me=Fe ³⁺, Ti³⁺) solid solutions with a rock salt structure

Abstract

Metastable LiMeO₂–ZnO (Me=Fe ³⁺, Ti³⁺) solid solutions with a rock salt crystal structure have been synthesized by the solid-state reaction of ZnO with LiMeO₂ complex oxides at 7.7 GPa and 1350–1450 K. The structure, phase composition, thermal stability and thermal expansion of the recovered samples have been studied by X-ray diffraction with synchrotron radiation. At ambient pressure, rock salt LiMeO₂–ZnO solid solutions are kinetically stable up to 670–800 K, depending on the composition.

Keywords:

• oxides
• high pressure
• high temperature
• chemical synthesis
• solid solutions
• X-ray diffraction

Acknowledgements

The authors are grateful to T. Chauveau, K.S. Napolskii and L.A. Trusov for help with X-ray diffraction, TG and SEM studies, respectively, to J. Bednarcik for assistance with experiments at beamlime BW5, HASYLAB-DESY and to V.A. Lebedev for hydrothermal synthesis of LiTiO₂. X-ray diffraction measurements at the B2 beamline have been carried out 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. P.S.S. is grateful to the French Ministry of Foreign Affairs for funding provided (BGF fellowship no. 2007 1572).