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Title: Mechanical confinement for improved energy storage density in BNT-BT-KNN lead-free ceramic capacitors

Abstract

With the advent of modern power electronics, embedded circuits and non-conventional energy harvesting, the need for high performance capacitors is bound to become indispensible. The current state-of-art employs ferroelectric ceramics and linear dielectrics for solid state capacitance. However, lead-free ferroelectric ceramics propose to offer significant improvement in the field of electrical energy storage owing to their high discharge efficiency and energy storage density. In this regards, the authors have investigated the effects of compressive stress as a means of improving the energy storage density of lead-free ferroelectric ceramics. The energy storage density of 0.91(Bi{sub 0.5}Na{sub 0.5})TiO{sub 3}-0.07BaTiO{sub 3}-0.02(K{sub 0.5}Na{sub 0.5})NbO{sub 3} ferroelectric bulk ceramic was analyzed as a function of varying levels of compressive stress and operational temperature .It was observed that a peak energy density of 387 mJ.cm{sup -3} was obtained at 100 MPa applied stress (25{sup o}C). While a maximum energy density of 568 mJ.cm{sup -3} was obtained for the same stress at 80{sup o}C. These values are indicative of a significant, 25% and 84%, improvement in the value of stored energy compared to an unloaded material. Additionally, material's discharge efficiency has also been discussed as a function of operational parameters. The observed phenomenon has been explained onmore » the basis of field induced structural transition and competitive domain switching theory.« less

Authors:
; ;  [1]
  1. School of Engineering, Indian Institute of Technology Mandi, 175 001 (India)
Publication Date:
OSTI Identifier:
22299793
Resource Type:
Journal Article
Journal Name:
AIP Advances
Additional Journal Information:
Journal Volume: 4; Journal Issue: 8; Other Information: (c) 2014 Author(s); Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 2158-3226
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CERAMICS; COMPARATIVE EVALUATIONS; DENSITY; EFFICIENCY; ENERGY DENSITY; ENERGY STORAGE; FERROELECTRIC MATERIALS; NIOBATES; STRESSES; TITANATES; TITANIUM OXIDES

Citation Formats

Chauhan, Aditya, Patel, Satyanarayan, and Vaish, Rahul. Mechanical confinement for improved energy storage density in BNT-BT-KNN lead-free ceramic capacitors. United States: N. p., 2014. Web. doi:10.1063/1.4892608.
Chauhan, Aditya, Patel, Satyanarayan, & Vaish, Rahul. Mechanical confinement for improved energy storage density in BNT-BT-KNN lead-free ceramic capacitors. United States. https://doi.org/10.1063/1.4892608
Chauhan, Aditya, Patel, Satyanarayan, and Vaish, Rahul. 2014. "Mechanical confinement for improved energy storage density in BNT-BT-KNN lead-free ceramic capacitors". United States. https://doi.org/10.1063/1.4892608.
@article{osti_22299793,
title = {Mechanical confinement for improved energy storage density in BNT-BT-KNN lead-free ceramic capacitors},
author = {Chauhan, Aditya and Patel, Satyanarayan and Vaish, Rahul},
abstractNote = {With the advent of modern power electronics, embedded circuits and non-conventional energy harvesting, the need for high performance capacitors is bound to become indispensible. The current state-of-art employs ferroelectric ceramics and linear dielectrics for solid state capacitance. However, lead-free ferroelectric ceramics propose to offer significant improvement in the field of electrical energy storage owing to their high discharge efficiency and energy storage density. In this regards, the authors have investigated the effects of compressive stress as a means of improving the energy storage density of lead-free ferroelectric ceramics. The energy storage density of 0.91(Bi{sub 0.5}Na{sub 0.5})TiO{sub 3}-0.07BaTiO{sub 3}-0.02(K{sub 0.5}Na{sub 0.5})NbO{sub 3} ferroelectric bulk ceramic was analyzed as a function of varying levels of compressive stress and operational temperature .It was observed that a peak energy density of 387 mJ.cm{sup -3} was obtained at 100 MPa applied stress (25{sup o}C). While a maximum energy density of 568 mJ.cm{sup -3} was obtained for the same stress at 80{sup o}C. These values are indicative of a significant, 25% and 84%, improvement in the value of stored energy compared to an unloaded material. Additionally, material's discharge efficiency has also been discussed as a function of operational parameters. The observed phenomenon has been explained on the basis of field induced structural transition and competitive domain switching theory.},
doi = {10.1063/1.4892608},
url = {https://www.osti.gov/biblio/22299793}, journal = {AIP Advances},
issn = {2158-3226},
number = 8,
volume = 4,
place = {United States},
year = {Fri Aug 15 00:00:00 EDT 2014},
month = {Fri Aug 15 00:00:00 EDT 2014}
}