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

Abstract

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 ''a'' and quadratic magnetoelectric coefficient ''b'' are measured with the help of custom-designed setup. The results on magnetoelectric and magnetodielectric properties of composites are interesting.

Dielectric and Energy Storage Properties of Ba(1−x)CaxZryTi(1−y)O3 (BCZT): A Review

“…The tanδ was found to be maximum at T m for the composition 0.50BCT–0.50BZT. With the increase in frequency, the dielectric loss first decreased then nearly reached a constant value [128]. Pakpoom Jarupoom et al investigated the effects of LSMO additive on the dielectric properties of BZT ceramics.…”

Magnetodielectric Effect in Microwave-Sintered Ba0.8Sr0.2TiO3 and Co0.9Ni0.1Fe2O4 Composite

“…Mc is observed in composites with or without ME coupling. Typically, the magnitude of Mc may be positive or negative, depending on the nature of the composite; if the composite shows high ME coupling, the Mc value is negative [7]. Based on the aforementioned discussion, (1-x)Ba 0.8 Sr 0.2 TiO 3 xCo 0.9 Ni 0.1 Fe 2 O 4 ((1-x)BST xCNFO) composite is prepared via hydroxide co-precipitation in this study.…”