Dysprosium doping induced effects on structural, dielectric, energy storage density, and electro-caloric response of lead-free ferroelectric barium titanate ceramics
Source abstract
Abstract
This work highlights the influence of dysprosium (Dy) doping on structural, dielectric, ferroelectric, energy storage density (ESD) and the electro-caloric(EC) response of solid state synthesized Ba1−xDyxTiO3 (BDT) ceramics with a composition of x varying from 0 to 0.05. The X-ray diffraction and Raman studies suggest that BDT ceramics exhibited pure perovskite tetragonal phase. Scanning electron microscopy (SEM) analysis evidences that Dy doping causes a significant reduction in grain size. The Ba0.99Dy0.01TiO3 ceramics exhibited enhanced dielectric constant and ferroelectric polarization due to the optimum mobility of domains. The temperature-dependent dielectric studies depict that the tetragonal ferroelectric—cubic paraelectric phase transition temperature (Tc) is shifted from 140 to 80 °C as x varies from 0 to 0.05. Further, BDT ceramics are found to be normal ferroelectric at low composition and is of relaxor type at x = 0.05. The Ba0.99Dy0.01TiO3 ceramics exhibited optimum recoverable ESD of 278 mJ/cm3 and an efficiency (η) of 67% at an electric field of 50 kV/cm. Moreover, the values of ESD and η are stable up to 107 cycles and at different operating temperatures ranging from RT to 70 °C. Besides, the Ba0.99Dy0.01TiO3 ceramics demonstrated an enhanced EC effect with an adiabatic temperature change (ΔT) $$approx$$ 1.92 K in the vicinity of Tc at a field of 50 kV/cm and an EC responsivity (ΔT/E) $$approx$$ 0.38 K m/MV compared to other BT based ceramics.
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Research context
OpenAlex topics: Ferroelectric and Piezoelectric Materials · Microwave Dielectric Ceramics Synthesis · Dielectric materials and actuators
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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