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