Microstructure and dielectric properties of BF–PFN ceramics with negative dielectric loss

• Published in: Journal of materials science. Materials in electronics Vol. 29; no. 20; pp. 17262 - 17268
• Main Authors: Bartkowska, Joanna A., Bochenek, Dariusz
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.10.2018; Springer Nature B.V
• Subjects: Bismuth compounds; Ceramics; Characterization and Evaluation of Materials; Chemical composition; Chemistry and Materials Science; Construction materials; Dielectric loss; Dielectric properties; Electric fields; Electromagnetic radiation; Materials Science; Multiferroic materials; Optical and Electronic Materials; Organic chemistry; Permittivity; Radiation shielding; Temperature dependence
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-018-9820-7

Multiferroics with negative value of dielectric constant are very promising materials because of their modern applicability. These materials can be used as materials for the construction of electromagnetic radiation shields. The subject of the research is multiferroic BiFeO 3 –PbFe 1/2 Nb 1/2 O 3 (BF–PFN) ceramics. For all multiferroic materials the following studies are conducted: SEM, EDS and the temperature dependence of dielectric constant ε′(T) . Above a certain temperature (different for different chemical compositions) the value of dielectric constant reaches negative values. Such the behavior of the dielectric constant may indicate that the polarization inside the material has a reverse direction to the external electric field. That is, the electric field inside the material counteracts the applied external electric field. The obtaining materials also show negative dielectric losses. The Axelrod model is used to explain the mechanism that causes negative dielectric loss.