| http://www.w3.org/ns/prov#value | - The piezoelectric material can be quartz, Rochelle salt, barium titanate, zinc oxide, lead titanate, lead zirconate titanate, lead lanthanum zirconate titanate, lead magnesium niobate, potassium niobate, potassium sodium niobate, potassium tantalate niobate, lead niobate, lithium niobate, lithium tantalate, fluoride poly(vinylidene flouride or other suitable material.
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