Lead zirconate titanate

A ferroelectric substance is a material that exhibits a spontaneous electric polarization that can be reversed by the application of an external electric field. This property allows ferroelectric materials to be used in various applications such as memory storage devices, sensors, and actuators. Examples of ferroelectric substances include lead zirconate titanate (PZT) and barium titanate.

Not ferrous, but ferroelectric !

Piezoelectric materials are typically made from ceramic crystals such as quartz, lead zirconate titanate (PZT), or polyvinylidene fluoride (PVDF). These materials have the ability to generate an electric charge in response to mechanical stress and vice versa, making them useful in a variety of applications such as sensors, actuators, and energy harvesting devices.

Hands can generate electricity through a phenomenon called piezoelectricity. When pressure or mechanical stress is applied to certain materials like quartz or lead zirconate titanate, they produce an electric charge. This means that activities like squeezing, tapping, or even just moving can create small amounts of electrical energy.