Electrocaloric properties of epitaxial strontium titanate films
Zhang, J. and Mısırlıoğlu, Burç and Alpay, S. P. and Rossetti, G. A., Jr. (2012) Electrocaloric properties of epitaxial strontium titanate films. Applied Physics Letters, 100 (22). ISSN 0003-6951 (Print) 1077-3118 (Online)
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Official URL: http://dx.doi.org/10.1063/1.4721668
The electrocaloric (EC) response of strontium titanate thin films is computed as a function of misfit strain, temperature, electric field strength, and electrode configuration using a nonlinear thermodynamic theory. For films in a capacitor configuration on compressive substrates, the transition between paraelectric and strain-induced ferroelectric tetragonal phases produces a large adiabatic temperature change, Delta T = 5K, at room temperature for electric field changes Delta E = 1200 kV/cm. For films on tensile substrates, the transition between the paraelectric and strain-induced ferroelectric orthorhombic phases can also be accessed using inter-digitated electrodes (IDEs). The maximum EC response occurs for IDEs with a  orientation.
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