Improvement in the structural, dielectric, and magnetic properties of CFO-doped KNNS-BKT ceramics

• Published in: Journal of materials science. Materials in electronics 2023-02, Vol.34 (4), p.311, Article 311
• Main Authors: Thakur, Priyanka, Gupta, Kritika, Thakur, Prashant, Kumar, Ajith S., Sudarsanan, Vivek, Sharma, Pankaj, Lal, Madan
• Format: Article
• Language: English
• Subjects: Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Cobalt ferrites; Composite materials; Coupling coefficients; Curie temperature; Dielectric properties; Ferroelectricity; Ferromagnetism; Hysteresis loops; Magnetic properties; Materials Science; Morphology; Optical and Electronic Materials; Phase transitions; Physics; Random access memory; Room temperature
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-022-09782-6

Multiferroics/Magnetoelectric materials have received global interest due to the exhibiting ordered coupling between magnetic and ferroelectric phases and simultaneously showing a large magnetoelectric coupling coefficient. In the present work, CoFe 2 O 4 -doped 0.97(K 0.4 Na 0.6 Nb 0.96 Sb 0.04 O 3 )–0.03(Bi 0.5 K 0.5 TiO 3 ) ceramics were synthesized by a modified two-step solid-state reaction method. Moreover, the correlation between structural, dielectric, and magnetic properties was investigated in detail. X-ray diffraction, along with Rietveld refinement, shows the co-existence of rhombohedral (Amm2), tetragonal (P4mm), and cubic (Fd3m) phases in the CoFe 2 O 4 -doped ceramics. The scanning electron microscope shows that all the ceramics have rod-like and spherical cuboid-shaped grain morphology. Dielectric study indicates an increase in Curie temperature ( T C ) with the rise in CoFe 2 O 4 content. These composites have a well-saturated hysteresis loop, confirming the ferromagnetic behavior of composites at room temperature. The composite with x  = 0.15 shows a maximum ME coupling coefficient of 21.88 mV/(cm.Oe).