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Pichittra Thawong1, Sasipohn Prasertpalichat1,2, Tawat Suriwong2,3
1Department of Physics, Faculty of Science, Naresuan University, Phitsanulok, 65000, Thailand.
Scientific Reports
|July 2, 2025
Summary
This study synthesized novel lead-free multiferroic ceramics ((1-x)BNKLT-xBBF) using solid-state combustion. The 0.8BNKLT-0.2BBF composition demonstrated promising room-temperature ferroelectric and ferromagnetic properties for advanced applications.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Condensed Matter Physics
Background:
- Lead-free piezoelectric ceramics are crucial for sustainable electronic devices.
- Multiferroic materials exhibiting both ferroelectric and ferromagnetic properties are highly sought after for advanced applications.
- The development of novel compositions is essential to achieve desired multiferroic characteristics.
Purpose of the Study:
- To synthesize and characterize novel lead-free (1-x)Bi0.5(Na0.77K0.20Li0.03)0.5TiO3-xBi0.8Ba0.2FeO3 ((1-x)BNKLT-xBBF) ceramics.
- To investigate the structural, dielectric, ferroelectric, and ferromagnetic properties of these ceramics.
- To identify optimal compositions for room-temperature multiferroic applications.
Main Methods:
- Solid-state combustion technique for ceramic synthesis.
- X-ray diffraction (XRD) for structural analysis and phase identification.
- Rietveld refinement for detailed structural parameter determination.
- Measurement of electrical and magnetic properties, including hysteresis loops.
Main Results:
- Pure perovskite structure with coexisting rhombohedral and tetragonal phases was confirmed.
- Unit cell volume, grain size, and density increased with increasing Ba-Fe content (x).
- Resistivity decreased with increasing x.
- Compositions with x = 0.2-0.4 exhibited room-temperature multiferroic behavior.
- The 0.8BNKLT-0.2BBF ceramic showed excellent properties: high density (95.48%), high dielectric constant (1746), low dielectric loss (0.0296), strong ferroelectricity (Pr=6.46 µC/cm², Ec=11.84 kV/cm), and notable ferromagnetism (Mr=0.002 emu/g, Hc=110 Oe).
Conclusions:
- The substitution of Bi/Ti with Ba/Fe ions in the BNKLT ceramics effectively induces multiferroic properties.
- The 0.8BNKLT-0.2BBF composition represents a promising lead-free material for room-temperature multiferroic device applications.
- The study highlights the potential of tailored solid-state synthesis for developing advanced functional ceramics.
