Abstract
Magnetoelectric (ME) nanocomposites of sodium potassium lithium niobate-nickel/cobalt ferrite, with general formula x-NKLN− (1-x) (MFO), where M stands for Nickel or Cobalt, are synthesized and their ME properties investigated. Piezoelectric phase constituted by NKLN is synthesized by the solid-state reaction route, and magnetic nanoferrite phase by coprecipitation. Two phases are combined at different molar weight ratios and sintered to attain composites with built in ME properties. The samples are characterized for their structure, morphology, density, piezoelectric, dielectric, and ME properties. Samples with x=0.8 and 0.85 attained required densities to pole electrically and measure piezoelectric and ME properties. Nickel-based composites provide largest ME coefficient reported for such materials. Sample with x=0.85 have higher values for ME coefficients; so are better for applications as sensors and actuators. Again, Nickel-based composites provide better ME coupling than cobalt based one, which is attributed to magnetic softness of nickel.
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