The most successful piezoelectric ceramics are based on lead zirconate and lead titanate. Environmental concerns over their lead content could disappear with the advent of a new ceramic that is lead-free.
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Cross, E. Lead-free at last. Nature 432, 24–25 (2004). https://doi.org/10.1038/nature03142
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DOI: https://doi.org/10.1038/nature03142
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