Which material is known for mechanical and electrical stability, insolubility in liquids, and resistance to aging when used in transducers?

• A. Lithium sulfate
• B. Barium titanate
• C. Quartz
• D. Rochelle salts

Answer: (C)

Quartz is prized in transducers because its crystal lattice provides exceptional stability in both mechanical and electrical properties. This material is chemically inert and insoluble, so it resists degradation when exposed to liquids during immersion or operation. It also exhibits very little aging of its piezoelectric coefficients, meaning its performance remains consistent over long periods. In contrast, Rochelle salts are water-soluble, lithium sulfate isn’t used for durable transducers, and barium titanate, while effective, is a ceramic that tends to show more aging and temperature sensitivity. So quartz best fits the needs for mechanical and electrical stability, insolubility in liquids, and resistance to aging in transducers.