Mn-Doped BaTiO3 Ceramics: Thermal and Electrical Properties for Multicaloric Applications

Abstract

Multiferroic materials are widely used in microelectronics because they are sensitive to elastic, magnetic, and electric fields and there is an intrinsic coupling between them. In particular, transition metal-doped BaTiO3 is considered as a viable multiferroic because of the simultaneous presence of ferroelectricity and magnetism. In this work, we study the electrical and thermal properties of Mn-doped BaTiO3 ceramics that can be used for multicaloric applications. We found that Mn doping leads to the broadening and shifting of the phase transition accompanied with simultaneous decrease of latent heat and entropy. Mn doping causes a decrease in the bulk resistivity while contact resistance remains intact. Doped ceramics can withstand high electric fields (up to 40 kV/cm) and exhibit linear I-V characteristics followed by the Schottky limited current in contrast to earlier observations. As such, these ceramics are promising for multicaloric applications.

Engineering the Microstructure and Functional Properties of 0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO3 Thin Films

“…With increasing temperature, its lossy behavior is effectively reduced due to manganese doping. − The strongly broadened dielectric permittivity peak is at about 55–75 °C. Lowering the Curie temperature upon manganese doping observed in the studied films was also reported for other perovskite oxides. , Despite a broad peak due to presumed phase transition, the dielectric properties are almost temperature-independent (Δε < 5% between 25 °C – 125 °C), which is favorable for implication in many applications.…”

“…Lowering the Curie temperature upon manganese doping observed in the studied films was also reported for other perovskite oxides. 52,54 Despite a broad peak due to presumed phase transition, the dielectric properties are almost temperature-independent (Δε < 5% between 25 °C − 125 °C), which is favorable for implication in many applications.…”

Enhanced electrocaloric effect of P(VDF-TrFE)-based nanocomposites with Ca and Sn co-doped BaTiO3 particles

“…For the estimations, density of the P(VDF-TrFE) was used as 1.77 g/cm 3 [21] and the value obtained from Archimedes method was used for the density of the BCST fillers. For the specific heat, 2000 J/kg.K and 500 J/kg.K were used for the pristine copolymer [22] and BCST particle [23], respectively. Using the rule of mixtures, 1784, 1681, 1585 J/kg.K was estimated for 5, 7.5 and 10 vol % BCST containing composites.…”

Mn- and Yb-Doped BaTiO3-(Na0.5Bi0.5)TiO3 Ferroelectric Relaxor with Low Dielectric Loss

“…The interesting physical properties of relaxor ferroelectrics that exhibit diffusion during phase transitions have gained considerable attention, as they have practical potential for applications such as electrostrictive components [ 1 ], PTCRs (positive temperature coefficient resistors) [ 2 , 3 ], multilayer ceramics capacitors (MLCCs) [ 4 ] and multicaloric applications [ 5 ]. Classic ferroelectrics can be transformed into relaxor ferroelectrics (RFEs) by means of a doping strategy, such as BaTiO 3 (BT)-based [ 6 ], (Na 0.5 Bi 0.5 )TiO 3 (NBT)-based [ 7 , 8 ] and other traditional ferroelectric systems [ 9 , 10 ].…”