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- 저자 : Patel Satyanarayan (검색결과 2 건)
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Impedance and modulus analysis of barium calcium titanate ferroelectric ceramics
Patel Satyanarayan,Kodumudi Venkataraman Lalitha,Yadav Harekrishna 한국세라믹학회 2021 한국세라믹학회지 Vol.58 No.3
BaTiO 3 -based derivatives have been explored in recent times for potential applications in energy harvesting and ultrasonics. To this end, energy harvesting and conversion applications require an understanding of the conduction and loss mechanisms. The conduction mechanism in Ba 0.9 Ca 0.1 TiO 3 (BCT) ceramics is studied using impedance spectroscopy at different temperatures. Impedance analysis suggests the presence of two types of relaxation processes corresponding to grain and grain boundary contributions. The relaxation mechanism follows non-Debye-type behavior. The high resistance of the grain (bulk) in the ferroelectric region does not contribute to the high losses; the losses probably result from the phase transition. In addition, BCT ceramics exhibit a negative temperature coefficient of resistance (NTCR). The open-circuit pyroelectric voltage shows a twofold increase compared to (Ca, Zr) modification in BaTiO3.
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Patel Satyanarayan,Yadav Harekrishna,Kumar Manish 한국세라믹학회 2021 한국세라믹학회지 Vol.58 No.4
In this work, a systematic approach of waste (thermal/mechanical) energy harvesting and storage potential is studied in Ba 0.85 Zr 0.15 TiO 3 (BZT) ceramics. The eff ect of stress on energy storage density (harvesting/storage) and electrocaloric per- formance is also studied. For this purpose, polarization–electric fi eld hysteresis loops were recorded at various temperatures and uniaxial compressive stress. The Olsen cycle and electro-mechanical cycle are used for direct waste heat or mechanical energy to electrical energy conversion. A thermal energy-harvesting density of 42 kJ/m 3 per cycle was obtained when the Olsen cycle was operated between 296–343 K and 0.25–1.5 MV/m. The electro-mechanical cycle-based energy harvesting is estimated as 78 kJ/m 3 under the applied stress of 5–160 MPa and the electric fi eld of 0.25–1.5 MV/m. The energy storage density is found as 39 kJ/m 3 at zero stress fi eld and 343 K, which increases to 53 kJ/m 3 under the biased stress of 80 MPa in a wide operating temperature range of 296–328 K. It is observed that the high energy storage is a result of the reduction of the hysteresis loss. The electrocaloric temperature is found as 0.16 K and 0.18 K under the 0 and 80 MPa stress fi elds, respectively. Overall, the reported fi ndings will enrich our understanding of the stress eff ect on BZT materials, which off ers high performance for energy harvesting and storage-based applications. Moreover, this work can be also helpful in improv- ing the energy storage density and electrocaloric eff ect via stress confi nement.
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