Study of barium titanate/nickel-zinc ferrite based composites: Electrical and magnetic properties and humidity sensitivity

Abstract

Composites based on barium titanate and nickel zinc ferrite doped with cooper and samarium were prepared by a mixing method. The formation of barium titanate tetragonal crystal structure and nickel zinc ferrite cubic spinel structure was identified. Polygonal grains were formed in all three types of ceramics. Due to the very high conductivity of ferrite phase in the materials the ferroelectric hysteresis loops were roundish and not typical for classical ferroelectric material. The break down field was found to be similar for all compositions. Leakage current measurements have shown the existence of different types of conductivity mechanisms in each material. The impedance analysis suggested a bit stronger impact of grain boundaries on total conductivity of the composites and the mechanism of polaronic conduction of two types. The magnetization of the composites is lower than for the pure ferrite phase and corresponds to the weight fraction of the ferrite phase. The soft magnetic nature of these composites might be very useful for development of multifunctional devices which will be able to switch the magnetization with small external magnetic field. Humidity sensing properties of the prepared ceramics were also investigated.

Effectuality of the Frequency Levels on the C&G/ω–V Data of the Polymer Interlayered Metal-Semiconductor Structure

“…Zinc ferrite (ZnFe2O4) was chosen as a dopant material in this study due to its properties that can contribute to the charge transitions between metal and semiconductor. Zinc ferrite is not only of interest for essential examination in magnetization, but ferrites also have low-hole semiconductors and separators at low temperatures; they have been utilized in various technologically significant applications, for example, gas sensors (Patil et al, 2014), magnetization materials (Vijatović-Petrović et al, 2020), photocatalysis (Hou et al, 2018), catalysts (Zhang et al, 2015), and absorbance materials (Shultz et al, 2006). Moreover, for medical and industrial purposes, zinc ferrite has been developing immensely since the most recent decade.…”