The spectroscopy function and line shape of slow responses are defined in time domain.In dielectric and piezoelectric relaxations experimental results show that this method has high resolution.When an action is applie...The spectroscopy function and line shape of slow responses are defined in time domain.In dielectric and piezoelectric relaxations experimental results show that this method has high resolution.When an action is applied to a substance gystem,there are two parts of response presented in the system.One of which is the fast response.展开更多
The electrocaloric effect(ECE) of multilayer ceramic capacitor(MLCC) of Y5 V type was directly measured via a differential scanning calorimetry(DSC) method and a reference resistor was used to calibrate the heat flow ...The electrocaloric effect(ECE) of multilayer ceramic capacitor(MLCC) of Y5 V type was directly measured via a differential scanning calorimetry(DSC) method and a reference resistor was used to calibrate the heat flow due to the heat dissipation. The results are compared with those calculated from Maxwell relations by using the polarization data obtained from the polarization–electric field hysteresis loops. The direct method shows a larger ECE temperature change, which is accounted for the situation approaches an ideal condition. For the indirect method using Maxwell relations, only the polarization projection along the electric field was taken into account, which will be less than the randomly distributed real polarizations that contribute to the ECE. The MLCCs exhibit a broad peak of ECE around 80 C, which will be favorite for the practical ECE cooling devices.展开更多
基金Supported by the National Natural Science Foundation of China
文摘The spectroscopy function and line shape of slow responses are defined in time domain.In dielectric and piezoelectric relaxations experimental results show that this method has high resolution.When an action is applied to a substance gystem,there are two parts of response presented in the system.One of which is the fast response.
基金supported by the National Natural Science Foundation of China(Grant No.51372042)the Department of Education of Guangdong Province of People’s Republic of China(Grant No.2014GKXM039)+1 种基金Guangdong Provincial Natural Science Foundation(Grant No.2015A030308004)the NSFC-Guangdong Joint Fund(Grant NoU1501246)
文摘The electrocaloric effect(ECE) of multilayer ceramic capacitor(MLCC) of Y5 V type was directly measured via a differential scanning calorimetry(DSC) method and a reference resistor was used to calibrate the heat flow due to the heat dissipation. The results are compared with those calculated from Maxwell relations by using the polarization data obtained from the polarization–electric field hysteresis loops. The direct method shows a larger ECE temperature change, which is accounted for the situation approaches an ideal condition. For the indirect method using Maxwell relations, only the polarization projection along the electric field was taken into account, which will be less than the randomly distributed real polarizations that contribute to the ECE. The MLCCs exhibit a broad peak of ECE around 80 C, which will be favorite for the practical ECE cooling devices.
