In a gas lighter, mechanical energy is converted into electrical energy by using crystals of barium titanate. Barium titanate is :

piezoelectric but not ferroelectric

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both piezoelectric as well as ferroelectric

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ferroelectic

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neither ferroelectioc nor piezoelectric

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Solution

The correct option is B both piezoelectric as well as ferroelectric
Barium titanate is the inorganic compound with the chemical formula $B a T i O_{3}$ . This titanate is a ferroelectric ceramic material, with a photorefractive effect and piezoelectric properties. It is used in capacitors, electromechanical transducers and nonlinear optics. So barium-tintate acts like piezoelectric as well as ferroelectric. Hence option B is correct.

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