Multiferroic properties of hexagonal Ba3Ti2MnO9

摘要

The magnetic and electrical properties of hexagonal Ba3Ti2MnO9 are investigated. The material is a noncentrosymmetric evolution from hexagonal BaTiO3 with a space group P6(3)mc. The existence and distribution of both Mn4+ and Ti4+ are checked using an electron energy-loss spectroscopy line scan by high resolution transmission electron microscopy. Magnetic transitions are attributed to the short range ordering and magnetic frustration. The frequency independent behavior of the dielectric peak shows a ferroelectric transition at 222 K. Both Positive Up and Negative Down (PUND) techniques and the local piezoresponse confirm the ferroelectric behavior of Ba3Ti2MnO9.