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Li0.5Bi2.5Nb2O9: An alkali‐metal bismuth layer structured ferroelectric with high TC and small orthorhombic distortion

Li0.5Bi2.5Nb2O9: An alkali‐metal bismuth layer structured ferroelectric with high TC and small... Bismuth layer structured ferroelectrics (BLSFs) have drawn much attention due to their great potential for high‐temperature applications. It is generally accepted that BLSFs with small orthorhombic distortion should have low TC. In this paper, we report an anomalous example Li0.5Bi2.5Nb2O9 (LBN), which has small orthorhombic distortion but very high TC. LBN shows the highest TC (834°C) among currently reported prototype alkali‐metal BLSFs, which is attributed to its small tolerance factor. However, the refinement result reveals that LBN is orthorhombic with the space group of A21am, and the orthorhombic distortion of LBN a/b is merely 1.0019. The measurement of piezoelectric coefficient (d33 ∼ 6 pC/N) and observation of striped domain structure confirm the ferroelectricity nature of LBN. This work deepens our understanding of BLSFs and may lead to the finding of more novel BLSFs with high performance. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of the American Ceramic Society Wiley

Li0.5Bi2.5Nb2O9: An alkali‐metal bismuth layer structured ferroelectric with high TC and small orthorhombic distortion

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References (52)

Publisher
Wiley
Copyright
© 2023 The American Ceramic Society.
ISSN
0002-7820
eISSN
1551-2916
DOI
10.1111/jace.19174
Publisher site
See Article on Publisher Site

Abstract

Bismuth layer structured ferroelectrics (BLSFs) have drawn much attention due to their great potential for high‐temperature applications. It is generally accepted that BLSFs with small orthorhombic distortion should have low TC. In this paper, we report an anomalous example Li0.5Bi2.5Nb2O9 (LBN), which has small orthorhombic distortion but very high TC. LBN shows the highest TC (834°C) among currently reported prototype alkali‐metal BLSFs, which is attributed to its small tolerance factor. However, the refinement result reveals that LBN is orthorhombic with the space group of A21am, and the orthorhombic distortion of LBN a/b is merely 1.0019. The measurement of piezoelectric coefficient (d33 ∼ 6 pC/N) and observation of striped domain structure confirm the ferroelectricity nature of LBN. This work deepens our understanding of BLSFs and may lead to the finding of more novel BLSFs with high performance.

Journal

Journal of the American Ceramic SocietyWiley

Published: Sep 1, 2023

Keywords: Aurivillius piezoceramics; bismuth layer structured ferroelectrics; high‐temperature piezoceramics; Li 0.5 Bi 2.5 Nb 2 O9; structural distortion

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