Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 6, Issue 39, Pages 10618-10627Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8tc03610a
Keywords
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Funding
- Basic Science Center Project of NSFC [51788104]
- NSFC [51332002, 51761135118]
- Ministry of Science and Technology of China [2015CB654605]
- No. 62 Chinese Post-doc Foundation [2017M620042]
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(K,Na)NbO3 is a leading lead-free piezoelectric system, but its thermal instability of high piezoelectricity is still one of its shortcomings compared to its lead-containing counterparts. This work found that incorporating perovskite compounds with Zr ions at the B-site can lead to the simultaneous enhancement of piezoelectricity and thermal stability. The piezoelectric coefficient d(33) increased to similar to 450 pC N-1, and such a high d(33) value can be maintained within 10% change over a wide temperature range of 22-80 degrees C. The piezoelectric strain also reached 0.13% strain with a small variation (<10%) from room temperature to 130 degrees C. The intrinsic and extrinsic contributions to the piezoelectric effect were determined using a modified Rayleigh law as well as systematic analyses on the crystalline structure and electrical properties. A phenomenological interpretation is provided for the origin of the strong piezoelectricity and thermal stability in the diffused O-T phase transition. This study provides a new paradigm for the enhancement of electrical properties and thermal stability in lead-free piezoceramics.
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