• Stijepovic, Ivan
• Ilić, Nikola
• Dzunuzovic, Adis
• Bobic, Jelena
• Vijatovic-Petrovic, Mirjana
• Stojanovic, Biljana

Abstract

<jats:p>Composites based on barium titanate and nickel zinc ferrite doped with cooperand samarium were prepared by a mixing method. The formation of bariumtitanate tetragonal crystal structure and nickel zinc ferrite cubic spinelstructure was identified. Polygonal grains were formed in all three types ofceramics. Due to the very high conductivity of ferrite phase in thematerials the ferroelectric hysteresis loops were roundish and not typicalfor classical ferroelectric material. The break down field was found to besimilar for all compositions. Leakage current measurements have shown theexistence of different types of conductivity mechanisms in each material.The impedance analysis suggested a bit stronger impact of grain boundarieson total conductivity of the composites and the mechanism of polaronicconduction of two types. The magnetization of the composites is lower thanfor the pure ferrite phase and corresponds to the weight fraction of theferrite phase. The soft magnetic nature of these composites might be veryuseful for development of multifunctional devices which will be able toswitch the magnetization with small external magnetic field. Humiditysensing properties of the prepared ceramics were also investigated.</jats:p>

Topics

• impedance spectroscopy
• grain
• nickel
• phase
• zinc
• composite
• ceramic
• magnetization
• Barium
• Samarium