Magnetoelectric and magnetodielectric properties of LSMO–(BCT–BZT) composites

The present paper reports magnetoelectric and magnetodielectric properties of La 0.67 Sr 0.33 MnO 3 and (Ba 0.7 Ca 0.3 TiO 3 )–(BaZr 0.2 Ti 0.8 O 3 ) composites. y (La 0.67 Sr 0.33 MnO 3 ) + (1 − y )[ x (Ba 0.7 Ca 0.3 TiO 3 )–(1 − x )(BaZr 0.2 Ti 0.8 O 3 )] particulate composites are prepared for x = 0.40, 0.45, and 0.50 and for y = 0.1 and 0.175. Ferroelectric compositions [ x (Ba 0.7 Ca 0.3 TiO 3 )–(1 − x )(BaZr 0.2 Ti 0.8 O 3 )] are synthesized via ceramic route, while La 0.67 Sr 0.33 MnO 3 is synthesized via hydroxide co-precipitation route. Composites of La 0.67 Sr 0.33 MnO 3 and (Ba 0.7 Ca 0.3 TiO 3 )–(BaZr 0.2 Ti 0.8 O 3 ) are synthesized using ceramic method. The crystal structures of La 0.67 Sr 0.33 MnO 3 , [ x (Ba 0.7 Ca 0.3 TiO 3 )–(1 − x )(BaZr 0.2 Ti 0.8 O 3 )], and composites are investigated using X-ray diffractograms, while microstructures are investigated using scanning electron microscope. The dielectric properties of [ x (Ba 0.7 Ca 0.3 TiO 3 )–(1 − x )(BaZr 0.2 Ti 0.8 O 3 )] are determined as a function of temperature between 30 and 150 °C and at frequencies 1, 10, 100 kHz, and 1 MHz. The investigations on P – E hysteresis loops of [ x (Ba 0.7 Ca 0.3 TiO 3 )–(1 − x )(BaZr 0.2 Ti 0.8 O 3 )] show useful values of maximum polarization ( P max ) and remanent polarization ( P r ). Dielectric study on composites is carried out as a function of frequencies between 1 kHz and 1 MHz and for magnetic field between 0 and 6 KOe. The linear magnetoelectric coefficient “ α ” and quadratic magnetoelectric coefficient “ β ” are measured with the help of custom-designed setup. The results on magnetoelectric and magnetodielectric properties of composites are interesting.