Significantly enhanced energy storage density of NNT ceramics using aliovalent Dy3+ Dopant
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American Chemical Society
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Abstract. Full text article available at: https://doi.org/10.1021/acssuschemeng.0c08714
Sodium niobate (NN)-based lead-free ceramic DyxNa1āx(Nb0.9Ta0.1)O3 denoted as (DNNT) x = 0, 0.05, 0.1, 0.2, and 0.3 was synthesized via a conventional solid-state method to achieve bulk lead-free dielectric ceramics having an improved energy storage capability that can conceivably be used in pulsed power technology. The addition of Dy3+ broadened the phase transition peak, thereby strengthening the relaxor properties of the DNNT ceramic materials. The sampleās microstructure was explored using a scanning electron microscope, and its corresponding phase structure via X-ray diffraction (XRD). A systematic study was carried out for energy storage properties of 0.2 mol of Dy3+ (DNNT20) where a recoverable energy storage density (Wrec) of 4.61 J cmā3 with a breakdown strength (BDS) of 478 kV cmā1 and an energy storage efficiency (Ī·) of ā84% were achieved. Additionally, the DNNT20 ceramics displayed comparatively reasonable temperature stability (20ā140 Ā°C), excellent frequency stability (0.1ā100 Hz), and also fast chargeādischarge speed (ā¤0.5 Ī¼s). Thus, the DNNT20 ceramic materials can be of probable use for future energy storage applications.
Sodium niobate (NN)-based lead-free ceramic DyxNa1āx(Nb0.9Ta0.1)O3 denoted as (DNNT) x = 0, 0.05, 0.1, 0.2, and 0.3 was synthesized via a conventional solid-state method to achieve bulk lead-free dielectric ceramics having an improved energy storage capability that can conceivably be used in pulsed power technology. The addition of Dy3+ broadened the phase transition peak, thereby strengthening the relaxor properties of the DNNT ceramic materials. The sampleās microstructure was explored using a scanning electron microscope, and its corresponding phase structure via X-ray diffraction (XRD). A systematic study was carried out for energy storage properties of 0.2 mol of Dy3+ (DNNT20) where a recoverable energy storage density (Wrec) of 4.61 J cmā3 with a breakdown strength (BDS) of 478 kV cmā1 and an energy storage efficiency (Ī·) of ā84% were achieved. Additionally, the DNNT20 ceramics displayed comparatively reasonable temperature stability (20ā140 Ā°C), excellent frequency stability (0.1ā100 Hz), and also fast chargeādischarge speed (ā¤0.5 Ī¼s). Thus, the DNNT20 ceramic materials can be of probable use for future energy storage applications.
Keywords
Dielectric properties, Lead-free, Chargeādischarge properties, Particle size distribution, Energy storage, Sodium niobate, Power technology