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Low Temperature Production of Lead-Free Piezoelectric Thick Films

Lead-free piezoelectric materials have grown in importance through increased environmental concern and subsequent EU legislation. Integration of the next generation lead-free piezoelectric materials with substrates to form functional micro devices has received less attention. A low temperature molten salt powder synthesis combined with a hybrid powder/sol gel ink film have been used to produce lead free NaNbO3/Ka0.5Na0.5NbO3 thick films on substrates. The films have exhibited ferroelectric behaviour with piezoelectric coefficients in the region of 18pC/N.