Pyroelectricity of zinc oxide |
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| Affiliation: | 1. Université d’Artois, UCCS - Unité de Catalyse et de Chimie du Solide - CNRS UMR 8181, Faculté des Sciences Jean Perrin, Rue Jean Souvraz - SP 18, 62307 Lens, France;2. Ècole Nationale Supérieure de Chimie de Lille (ENSCL), CNRS UMR 8181, Unité de Catalyse et de Chimie du Solide (UCCS), Cité Scientifique, Bâtiment C7 - BP 90108, 59652 Villeneuve d’Ascq, France;1. Key Laboratory of Low Dimensional Materials and Application Technology, Xiangtan 411105, China;2. School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China;3. School of Physics and Optoelectronics, Xiangtan University, Xiangtan 411105, China |
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| Abstract: | Wurtzite lattices show piezoelectricity as well as pyroelectric effects. The pyroelectric change of polarisation with temperature has not yet been studied on ZnO. The pyroelectric constant pσ (constant stress) is reported here for the temperature range from 9.7 to 420°K. It is proportional to the specific heat at constant pressure for the whole temperature range. At low temperatures a T3 law holds. Furthermore the coefficients of thermal expansion are given for 300°K. This allows the determination of the pyroelectric constant pϵ(constant strain, 300°K) using piezoelectric constant observed by others. The data are compared with results for other crystals exhibiting wurtzite structure. |
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