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Life cycle assessment and environmental profile evaluation of lead-free piezoelectrics in comparison with lead zirconate titanate

Ibn-Mohammed, T., Reaney, I.M., Koh, S.C.L., Acquaye, Adolf, Sinclair, D.C., Randall, C.A., Abubakar, F.H., Smith, L., Schileo, G., Ozawa-Meida, L. and others. (2018) Life cycle assessment and environmental profile evaluation of lead-free piezoelectrics in comparison with lead zirconate titanate. Journal of the European Ceramic Society, 38 (15). pp. 4922-4938. ISSN 0955-2219. (doi:10.1016/j.jeurceramsoc.2018.06.044) (KAR id:71837)

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The prohibition of lead in many electronic components and devices due to its toxicity has reinvigorated the race to develop substitutes for lead zirconate titanate (PZT) based mainly on the potassium sodium niobate (KNN) and sodium bismuth titanate (NBT). However, before successful transition from laboratory to market, critical environmental assessment of all aspects of their fabrication and development must be carried out in comparison with PZT. Given the recent findings that KNN is not intrinsically ‘greener’ than PZT, there is a tendency to see NBT as the solution to achieving environmentally lead-free piezoelectrics competitive with PZT. The lower energy consumed by NBT during synthesis results in a lower overall environmental profile compared to both PZT and KNN. However, bismuth and its oxide are mainly the by-product of lead smelting and comparison between NBT and PZT indicates that the environmental profile of bismuth oxide surpasses that of lead oxide across several key indicators, especially climate change, due to additional processing and refining steps which pose extra challenges in metallurgical recovery. Furthermore, bismuth compares unfavourably with lead due to its higher energy cost of recycling. The fact that roughly 90–95% of bismuth is derived as a by-product of lead smelting also constitutes a major concern for future upscaling. As such, NBT and KNN do not offer absolute competitive edge from an environmental perspective in comparison to PZT. The findings in this work have global practical implications for future Restriction of Hazardous Substances (RoHS) legislation for piezoelectric materials and demonstrate the need for a holistic approach to the development of sustainable functional materials.

Item Type: Article
DOI/Identification number: 10.1016/j.jeurceramsoc.2018.06.044
Uncontrolled keywords: Piezoelectric materials, Life cycle assessment, Environmental legislation, Policy and decision making
Divisions: Divisions > Kent Business School - Division > Kent Business School (do not use)
Depositing User: Adolf Acquaye
Date Deposited: 24 Jan 2019 10:40 UTC
Last Modified: 16 Feb 2021 14:01 UTC
Resource URI: (The current URI for this page, for reference purposes)
Acquaye, Adolf:
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