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Bismuth ferrite belongs to magnetoelectric compounds which join, in the same crystal phase, two mutually excluding order parameters like magnetic and ferroelectric. In case of BiFeO3 both of these transition temperatures are considerably above room temperature what is important form the point of view of applications. In this paper electronic band structure calculations are presented. In the calculations, hybrid exchange interaction potential is applied, which gives the possibility to obtain correct insulating character of the compound without application of arbitrary Hubbard U parameter. The calculated densities of electronic states and magnetic properties are described. [ABSTRACT FROM AUTHOR]

Pb-based complex perovskites with Fe3+ like Pb(Fe⅔W⅓)O3 were found to be interesting because of their unique properties such as relaxor and magnetoelectric behavior. Pb(Fe⅔W⅓)O3 is ferroelectric with ferroelectric Curie temperature TC between 150 and 200 K and at the same time is antiferromagnetic with magnetic Néel temperature about 400 K. BiFeO3 is a well known perovskite compound which exhibits ferroelectric (TC = 1103 K) and antiferromagnetic (TN = 643 K) ordering simultaneously. The polycrystalline sample of 0.3Bi0.95Dy0.05FeO3-0.7Pb(Fe⅔W⅓)O3 were synthesized using standard sintering procedure. Magnetization vs. magnetic field (at 4.2 K) curves were measured. Magnetoelectric properties of the sample were obtained. [ABSTRACT FROM AUTHOR]

A polycrystalline ceramic of 0.5Bi0.95Dy0.05FeO3-0.5Pb(Fe2/3W1/3)O3 was synthesized from a solid-state reaction method. At room temperature material exhibits both magnetic and electric dipolar properties simultaneously. Detailed X-ray diffraction analysis and Mössbauer effect studies have been done to determine the crystallographic structure and magnetic properties of 0.5Bi0.95Dy0.05FeO3-0.5Pb(Fe2/3W1/3)O3. TN temperature was estimated at around 600 K. [ABSTRACT FROM AUTHOR]