A mid-infrared radiometric (MIR) method for precise in situ temperature measurements when studying pyroelectric and electrocaloric properties of bulk and film materials is presented. The method uses new MIR-temperature sensors based on narrowband high-speed and high-sensitive uncooled immersion lens A3B5 photodiodes with a precalibration procedure. They are completely insensitive to the background illumination with λ ≤ 1 µm and provide contactless temperature measurements directly in the area of laser heating action. An accuracy of 50 mK at the temperature around 20 °C, rapidly improving up to 1 mK at 200 °C, is achieved at the operation speed of 1 ms. The reliable and reproducible conditions of measurements of pyroelectric and electrocaloric properties of various samples are formulated, and the novel experimental setup is described in detail. The experimental verification of the method is performed by the measurements of pyroelectric properties of single crystals, bulk ceramics, and AlN film. The results of joint measurements of the pyroelectric and electrocaloric properties of the ferroelectric relaxor ceramics are also presented.
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January 2020
Research Article|
January 28 2020
Mid-infrared radiation technique for direct pyroelectric and electrocaloric measurements
Galina Yu. Sotnikova
;
Galina Yu. Sotnikova
a)
Ioffe Institute
, Politekhnicheskaya 26, St. Petersburg 194021, Russian Federation
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Gennadii A. Gavrilov
;
Gennadii A. Gavrilov
Ioffe Institute
, Politekhnicheskaya 26, St. Petersburg 194021, Russian Federation
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Alexander A. Kapralov
;
Alexander A. Kapralov
Ioffe Institute
, Politekhnicheskaya 26, St. Petersburg 194021, Russian Federation
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Kirill L. Muratikov
;
Kirill L. Muratikov
Ioffe Institute
, Politekhnicheskaya 26, St. Petersburg 194021, Russian Federation
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Elena P. Smirnova
Elena P. Smirnova
Ioffe Institute
, Politekhnicheskaya 26, St. Petersburg 194021, Russian Federation
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a)
E-mail: g.sotnikova@mail.ioffe.ru
Rev. Sci. Instrum. 91, 015119 (2020)
Article history
Received:
May 06 2019
Accepted:
December 15 2019
Citation
Galina Yu. Sotnikova, Gennadii A. Gavrilov, Alexander A. Kapralov, Kirill L. Muratikov, Elena P. Smirnova; Mid-infrared radiation technique for direct pyroelectric and electrocaloric measurements. Rev. Sci. Instrum. 1 January 2020; 91 (1): 015119. https://doi.org/10.1063/1.5108639
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