Fabrication of 0.7BaTiO₃-0.3Ni_0.7Zn_0.3Fe₂O₄ Multiferroic Composite Ceramics Prepared by the Solid-State Combustion Technique

Abstract

Lead-free multiferroic composite ceramics of 0.7BaTiO₃-0.3Ni_0.7Zn_0.3Fe₂O₄ (BT-NZF) were prepared by the solid-state combustion technique. The BT and NZF powders were calcined in the range of 1100 to 1200 °C for 4 h and 900 to 1100 °C for 2 h, respectively. Afterward, BT-NZF composite ceramics were sintered between 1100 and 1250 °C for 4 h. The effect of the firing temperature on the phase formation, microstructure, electrical, and magnetic properties of BT-NZF composite ceramics was investigated. X-ray diffraction of BT and NFZ powders showed the highest purity phase were prepared the calcination temperatures of 1100 and 1050 °C, respectively. The BT-NZF composite ceramics exhibited coexisting tetragonal perovskite and cubic spinel phases. The maximum density of 5.85 g/cm³ was obtained when sintering the composite ceramics at 1125 °C. The dielectric constant at room temperature increased with increased sintering temperature. The hysteresis loops showed leakage current in all samples. Ferromagnetic properties showed the highest M_s ∼ 24.56 emu/g measured under a magnetic field of 10,000 Oe from the sample sintered at 1150 °C.

Keywords:

• BT-NZF
• composites
• multiferroic
• ferroelectric
• ferromagnetic

Acknowledgments

This project is funded by National Research Council of Thailand (NRCT): (N41A650100), Naresuan University (NU) and National Science, Research and Innovation Fund (NSRF) with Grant No. R2565B059. Appreciations are also given to Asst. Prof. Dr. Kyle V. Lopin for his help in editing the manuscript.

Disclosure Statement

No potential conflict of interest was reported by the author(s).