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Title: Effect of A–site substitutions on energy storage properties of BaTiO3–BiScO3 weakly coupled relaxor ferroelectrics

Journal Article · · Journal of the American Ceramic Society
DOI:https://doi.org/10.1111/jace.16449· OSTI ID:1561219

Abstract Weakly coupled relaxors based on compositions (1‐ x ) BaTiO 3 ‐ x Bi Me O 3 , where Me is a metal ion, have attracted attention as potential candidates for high‐temperature high‐energy density capacitors. However, the necessary Bi content is typically high with x  = 0.3‐0.4. In order to reduce problems associated with compatibility for base metal electrodes and due to additional problems due to Bi volatility, it is desirable to lower the Bi content in the overall composition for these materials. Here, we have explored a possible way to reduce BiMeO 3 content through additional A‐site substitutions viz. Ca and Sn. The relaxor nature and energy storage properties of Sn‐modified (Ba,Ca)(Ti)O 3 ‐BiScO 3 ceramics were determined from their dielectric and ferroelectric behaviors. The material showed attractive properties in terms of a frequency‐independent (200 Hz‐1 MHz) dielectric response from room temperature to 200°C, extremely low loss and high‐energy storage efficiency. The structural phenomena underlying the functional properties of Sn‐modified (Ba,Ca)TiO 3 ‐BiScO 3 are characterized from temperature‐dependent X‐ray diffraction and pair distribution function analysis. In broader terms, the study illustrates the potential for tailoring relaxor behavior in Pb‐free ferroelectrics by combining phenomena, such as quantum fluctuations and lone pair stereochemical effect associated with different solid‐solution substitutions.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
City University of Hong Kong; Aarhus University; Danish Ministry of Higher Education and Science - Danish Agency for Science, Technology and Innovation; Danish National Research Foundation; USDOE
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1561219
Alternate ID(s):
OSTI ID: 1506133
Journal Information:
Journal of the American Ceramic Society, Vol. 102, Issue 10; ISSN 0002-7820
Publisher:
American Ceramic SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 27 works
Citation information provided by
Web of Science

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