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Which of the following is not a piezo-electric material?(a) quartz(b) rochelle salt(c) aluminium(d) barium titanateI had been asked this question during an online exam.My doubt is from Pressure Transducers in chapter Physiological Transducers of Biomedical Instrumentation

Answer»

Right choice is (a) quartz

Easiest explanation: Aluminium is not apiezo-electric material. Quartz is the most stable natural crystal with high mechanical and thermal stability and has voulme resistivity higher than 10^4 ohm-cm and SMALL internal electric loss. BARIUM titanate CERAMIC is a FERROELECTRIC crystal and has small voltage output.



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