Discussion
Which of the following are piezoelectric substances ?
(1) Barium titanate
(2) Lead titanate
(3) Lead zirconate
(4) Cadmium and sulphate
Answer: C
The piezoelectric substances are 1, 2 and 3.
Barium titanate and lead titanate are perovskite ferroelectric ceramics with strong piezoelectric effects, and lead zirconate is the other component of lead zirconate titanate (PZT), the most widely used piezoelectric ceramic. These are the materials used in ultrasonic transducers, buzzers and accelerometers.
'Cadmium and sulphate' is not a piezoelectric material; the cadmium compound with piezoelectric properties is cadmium sulphide, a semiconductor, and a sulphate salt is not used as a transducer. So every option including 4 is wrong.
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