Journal
ADVANCED MATERIALS
Volume 34, Issue 29, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202202558
Keywords
defect engineering; hardening effect; oxygen vacancy; piezoelectric
Categories
Funding
- Basic Science Centre Program of NSFC [51788104]
- National Nature Science Foundation of China [52032005, 81922019, 51972005, 52172128]
- National Key Research and Development Program of China [2020YFA0711700, 2021YFB3201100]
- Beijing Natural Science Foundation [JQ20009]
Ask authors/readers for more resources
This study proposes a method based on isolated oxygen vacancies to achieve a well-balanced performance of mechanical quality factor and piezoelectric coefficient in piezoelectric materials. The hardening effect associated with oxygen vacancies shows exceptional stability with increasing vibration velocity. This research has important implications for high-power applications such as pharmaceutical extraction and ultrasonic osteotomes.
Defect engineering is a well-established approach to customize the functionalities of perovskite oxides. In demanding high-power applications of piezoelectric materials, acceptor doping serves as the state-of-the-art hardening approach, but inevitably deteriorates the electromechanical properties. Here, a new hardening effect associated with isolated oxygen vacancies for achieving well-balanced performances is proposed. Guided by theoretical design, a well-balanced performance of mechanical quality factor (Q(m)) and piezoelectric coefficient (d(33)) is achieved in lead-free potassium sodium niobate ceramics, where Q(m) increases by over 60% while d(33) remains almost unchanged. By atomic-scale Z-contrast imaging, hysteresis measurement, and quantitative piezoresponse force microscopy analysis, it is revealed that the improved Q(m) results from the inhibition of both extrinsic and intrinsic losses while the unchanged d(33) is associated with the polarization contributions being retained. More encouragingly, the hardening effect shows exceptional stability with increasing vibration velocity, offering potential in material design for practical high-power applications such as pharmaceutical extraction and ultrasonic osteotomes.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available