1. Research in pyroelectricity became more sophisticated in the 19th century. 2. The process of pyroelectricity has been known from ancient times. 3. Pyroelectricity is also a necessary consequence of ferroelectricity.4. Ha�y's name is also known for the observations he made in pyroelectricity . 5. However, note that some piezoelectric materials have a crystal symmetry that does not allow pyroelectricity . 6. Very small changes in temperature can produce an electric potential due to a materials'pyroelectricity . 7. The piezoelectric effect is generally stronger in materials that also exhibit pyroelectricity , and all pyroelectric materials are also piezoelectric. 8. In 1824 William Thomson in 1878 and Woldemar Voigt in 1897 helped develop a theory for the processes behind pyroelectricity . 9. Theophrastus made the first known reference to the phenomenon of pyroelectricity , noting that the mineral tourmaline becomes charged when heated. 10. The property of pyroelectricity is the measured change in net polarization ( a vector ) proportional to a change in temperature.
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