The nature of the electrode state is produced in certain crystals by temperature changes. When certain dielectric (non-conductive) crystals are subjected to a uniform temperature change ΔT, they exhibit an electrode polarization ΔP. A material having a thermoelectric effect is called a thermoelectric material. Typical examples of the pyroelectric crystal of tourmaline, lithium sulfate monohydrate compound, sucrose and ferroelectric barium titanate.
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