期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 43, 页码 37298-37306出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b14958
关键词
(K,Na)NbO3; lead free; perovskite; piezoelectric; manganese doping
资金
- National Nature Science Foundation of China [51332002, 51572143, 51522212, 51702252]
- Science Challenge Project [JCKY2016212A503]
- China Postdoctoral Science Foundation [2016M602812]
Driven by an ever-growing demand for environmentally compatible materials, the past two decades have witnessed the booming development in the field of piezoelectrics. To maximally explore the potential of lead-free piezoelectrics, chemical doping could be an effective approach, referenced from tactics adopted in lead-based piezoelectrics. Herein, we reveal the distinct role of manganese in a promising lead-free perovskite (K, Na)NbO3 (denoted by KNN) in comparison to that in market-dominating lead-based counterparts [Pb(Zr, Ti)O-3, PZT]. In contrast to the scenario in PZT, manganese doping in KNN results in tremendously improved piezoelectric coefficient d(33) by nearly 200%, whereas the same doping species in PZT deteriorates the d(33) down to less than 30% of its original value. The result is rationalized from macroscopic and local electrical characterizations down to atomic-scale visualization. This study demonstrates that there is enormous space to further enhance piezoelectricity in lead-free systems because the chemical doping effect may completely differ in lead-containing and lead-free perovskites.
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