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|Metrology of pyroelectric and electrocaloric measurements in ferroelectric ceramics and thin films|
|Keywords: pyroelectrics, electrocalorics, thin films|
|The pyroelectric ceramics and thin films are extensively used in numerous applications, such as motion detection, environmental monitoring, thermal imaging energy harvesting and electrocaloric cooling [1,2]. Different techniques can be used to measure the pyroelectric coefficient [3,4]. The most commonly used technique involves the measurement of the pyroelectric current induced by controlled temperature variations. However, no limits in the applicability of this technique are given. In this work the metrology of pyroelectric measurements when different types of temperature profiles are used, is evaluated with the specific focus on the determination of pyroelectric response in thin film ceramic films. The domain of technique applicability as a function of temperature change, precision of current measurements and the temperature variation of pyroelectric coefficient is provided. The results are verified on typical pyroelectric materials in single crystalline (LaTaO3), bulk (BST) and thin film forms (PZT) without and with an applied electric field. The optimal conditions for the pyroelectric measurements in thin films where the pyroelectric coefficient exhibits either smooth temperature variation or peak response are provided. Finally, the electrocaloric coefficient was calculated from the pyroelectric measurements under varying applied electric fields and compared with the one directly measured by DSC setup. Acknowledgement Funding from the Technology Strategy Board (UK) under award number 73299- 501336, project “Advanced manufacturable sputtering of high performance pyroelectric thin film” is gratefully acknowledged.|
|Dr Andrey Berenov,
Department of Materials, Imperial College London
London, Greater London