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The U-type hexaferrites (Ba[Formula: see text]La[Formula: see text]Co2Fe[Formula: see text]O[Formula: see text] ([Formula: see text]= 0, 0.05, 0.10, 0.15, 0.20, 0.25) have been synthesized by auto-combustion method. The work involves the study of structural, microstructural, dielectric, magnetic and magneto-dielectric properties of the prepared materials. The structural analysis has been done by X-ray diffraction technique along with Le Bail refinement which confirmed the pure hexagonal phase for all the samples. The microstructural analysis has been carried out by field-emission scanning electron microscopy. The vibrating sample magnetometer is used to measure the magnetic properties. The sample with a composition of [Formula: see text] = 0.15 has shown the maximum magnetization of approximately 73.31 emu/g with the remnant magnetization of 38.89 emu/g and coercive field of 1.77 kOe at room temperature. Moreover, the same sample has delivered the maximum magneto-dielectric response of about 54.18% at 1.5-T field.

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This work promotes the room temperature energy storage properties of the multiferroics. In this approach, impacts of PrFeO3 doping on PT-based solid solutions (Pb[Formula: see text][Formula: see text]Pr[Formula: see text]Ti[Formula: see text][Formula: see text]Fe[Formula: see text]O3, [Formula: see text] = 0.21, 0.22, 0.23, 0.24, 0.25 and 0.26) have been explored. X-ray diffraction (XRD) patterns were used to estimate the crystallographic parameters, confirming the single phase tetragonal structure. The ferroelectric Curie temperature ([Formula: see text][Formula: see text]) is observed to drop from 410 K to below room temperature as the Pr concentration increases. The ferroelectric P-E loops were used to determine the energy storage values at room temperature. The sample [Formula: see text] = 0.24 achieved the maximum value of energy storage density of 362.25 mJ/cm3 with the efficiency of 40.5%. The ferroelectric P-E loops were used to determine the energy storage values at room temperature. The validity of magnetoelectric coupling in all samples was confirmed by magneto-dielectric studies and found that the sample [Formula: see text] = 0.24 shows the maximum response with the coupling coefficient ([Formula: see text]) = 15.54 g2/emu2.

This work harmonizes the experimental and theoretical study of electrocaloric effect (ECE) in (Pb[Formula: see text]Bi[Formula: see text](Zr[Formula: see text]Ti[Formula: see text]O3 solid solution by optimizing sintering temperature. Bi[Formula: see text]-doped PbZr[Formula: see text]Ti[Formula: see text]O3 solid solutions were synthesized by the conventional solid-state reaction method. Different samples were prepared by varying the sintering temperature. X-ray diffraction study confirms the crystalline nature of all the samples. An immense value of polarization has been acquired in the optimized sample. The maximum adiabatic temperature change of order 2.53 K with electrocaloric strength of 1.26 K mm kV[Formula: see text] has been achieved experimentally. Whereas a comparatively close value of ECE has been acquired from the theoretical calculations using a phenomenological approach. Furthermore, a large value (218 mJ cm[Formula: see text] of thermal energy conversion has been obtained using the Olsen cycle.