FeTiTaO6: A Lead-Free Relaxor Ferroelectric Based on the Rutile Structure


  • We thank the Department of Science and Technology (DST), Government of India, for support of this research. We also thank CSIR, New Delhi, for grant of a research project (J.G.) and a fellowship (R.M.). J.G. thanks the DST for awarding a Ramanna Fellowship. Supporting Information is available online from Wiley InterScience or from the authors.


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High-temperature relaxor ferroelectric behavior (Tm ∼ 550 K) is reported for the rutile-based oxide, FeTiTaO6. Our investigations of the structure and dielectric properties of MTiTaO6 (M = Al, Cr, Fe) have revealed that all the oxides possess disordered rutile structure but only the iron member shows a strong relaxor ferroelectric effect. The new material is lead-free and it is based on the rutile structure, unlike the conventional relaxors which are mostly derived from the perovskite structure.