Premium
Comparison of direct electrocaloric characterization methods exemplified by 0.92 Pb(Mg 1/3 Nb 2/3 )O 3 ‐0.08 PbTiO 3 multilayer ceramics
Author(s) -
Molin Christian,
Peräntie Jani,
Le Goupil Florian,
Weyland Florian,
Sanlialp Mehmet,
Stingelin Natalie,
Novak Nikola,
Lupascu Doru C.,
Gebhardt Sylvia
Publication year - 2017
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.14805
Subject(s) - electrocaloric effect , materials science , electric field , characterization (materials science) , thermocouple , dielectric , refrigerant , pyroelectricity , ceramic , voltage , ferroelectricity , thermistor , optoelectronics , composite material , electrical engineering , thermodynamics , nanotechnology , physics , engineering , quantum mechanics , gas compressor
Electrocaloric device structures have been developed as multilayer ceramics ( MLC s) based on fundamental research carried out on PMN ‐8 PT bulk ceramics. Two different MLC structures were prepared with nine layers each and layer thicknesses of 86 μm and 39 μm. The influence of the device design on its properties has been characterized by microstructural, dielectric, ferroelectric, and direct electrocaloric measurement. For direct characterization two different methods, ie temperature reading (thermistor and thermocouple) and heat flow measurement (differential scanning calorimetry), were used. A comparison of results revealed a highly satisfactory agreement between the different methods. This study confirms that MLC s are promising candidates for implementation into energy‐efficient electrocaloric cooling systems providing large refrigerant volume and high electrocaloric effect. Due to their micron‐sized active layers, they allow for the application of high electric fields under low operation voltages. We measured a maximum electrocaloric temperature change of Δ T =2.67 K under application/withdrawal of an electric field of Δ E =16 kV mm −1 , which corresponds to operation voltages below 1.5 kV.