The influence of TiO2 polymorph, mechanical milling and subsequent sintering on the formation of Ti-substituted spinel-related Li0.5Fe2.5O4
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Single-phased spinel-related titanium-substituted Li0.5Fe2.5O4 has been synthesized by sintering in air a mechanically pre-milled mixture of lithium carbonate, corundum-related iron (III) oxide and the rutile polymorph of titanium (IV) oxide at 700 °C (12 h). This temperature is ca. 450–500 °C less than the temperatures at which the material is normally prepared by conventional ceramic techniques. On replacing the rutile polymorph of titanium (IV) oxide in the pre-milled mixture by the anatase form the formation of single-phased titanium-substituted Li0.5Fe2.5O4 was not achieved even after sintering the mixture at 1,000 °C (12 h).
KeywordsTiO2 Milling Rutile Reflection Peak Increase Milling Time
We thank the Abdus Salam International Center for Theoretical Physics, ICTP, (Italy), and SIDA (Sweden) for financial and research support to HMW. We also thank the China Scholarship Council for financial support to XR. We are grateful to Professor FJ Berry for helpful discussion.
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