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Boosted piezoelectricity with excellent thermal stability in tetragonal NaNbO3-based ceramics

Journal Article · · Journal of Materials Chemistry. A
DOI:https://doi.org/10.1039/d0ta10470a· OSTI ID:1784907
 [1];  [1];  [1];  [2];  [1];  [1];  [1]
  1. Univ. of Science and Technology Beijing (China)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
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The realization of high piezoelectric performance and excellent temperature stability simultaneously in Pb-free ceramics is the key for replacing Pb-containing perovskites in the industry. In this study, large piezoelectric performance (d33 = 354 pC N–1) was achieved in a wide temperature sinterable potassium-free NaNbO3–BaTiO3–BaSnO3 system, which is twice more than the piezoelectricity found in NaNbO3–BaTiO3 binary ceramics. Structural refinement of high-energy synchrotron powder diffraction data suggests a single tetragonal structure with P4bm symmetry for the studied NaNbO3-based Pb-free ceramic. The results indicate that the small axial ratio favoring polarization reorientation benefits strong piezoelectricity, while the large oxygen octahedron tilt enhances the stability of the P4bm structure during the changing temperature according to the in situ high-energy synchrotron X-ray diffraction measurements and provides the foundation for the excellent thermal stability (20–100 °C) of the piezoelectric properties. Furthermore, a single tetragonal phase with a tiny axial ratio and large oxygen octahedron tilt effectively balances the piezoelectricity and thermal stability in Pb-free systems.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Natural Science Foundation of China (NSFC); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1784907
Alternate ID(s):
OSTI ID: 1759102
Journal Information:
Journal of Materials Chemistry. A, Journal Name: Journal of Materials Chemistry. A Journal Issue: 4 Vol. 9; ISSN 2050-7488
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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