Which of the following ceramics exhibits piezoelectricity?
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A.
BaTiO3
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B.
ZrO2
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C.
Al2O3
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D.
MgO
Correct Answer:
A. BaTiO3
Explanation:
Barium titanate (BaTiO3) is the correct answer because it is a well-known synthetic ceramic with a perovskite crystal structure that exhibits strong piezoelectric properties. Piezoelectricity is the ability of certain materials to generate an electric charge in response to applied mechanical stress, or conversely, to undergo mechanical deformation when an electric field is applied. While other materials listed like zirconium oxide (ZrO2), aluminum oxide (Al2O3), and magnesium oxide (MgO) are important industrial ceramics, they do not possess the non-centrosymmetric crystal structure required to exhibit piezoelectricity. Barium titanate is widely used in various applications, including capacitors, electromechanical transducers, and sensors, due to its high dielectric constant and efficient energy conversion.
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