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Direct and indirect electrocaloric measurements on 〈001〉-PbMg1/3Nb2/3O3-30PbTiO3 single crystals
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10.1063/1.4730338
/content/aip/journal/jap/111/12/10.1063/1.4730338
http://aip.metastore.ingenta.com/content/aip/journal/jap/111/12/10.1063/1.4730338
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

EC response measured for a 〈001〉-oriented PMN-30PT single crystal under a 12 kV/cm applied electric field.

Image of FIG. 2.
FIG. 2.

Estimation of the correction factor required to compensate the thermal losses during the direct ECE measurements.

Image of FIG. 3.
FIG. 3.

Comparison between the permittivity of the poled and unpoled 〈001〉-PMN-30PT crystals measured upon heating at 100 kHz.

Image of FIG. 4.
FIG. 4.

Remanent and maximum polarization measured as a function of temperature for the 〈001〉-PMN-30PT single crystal with a 10 kV/cm electric field applied in the 〈001〉 direction.

Image of FIG. 5.
FIG. 5.

Hysteresis loops measured at 87 °C, 105 °C, 135 °C, and 165 °C for the 〈001〉-PMN-30PT single crystal prepoled in the 〈001〉 direction.

Image of FIG. 6.
FIG. 6.

Evolution of the direction of the polarization when the system undergoes a transformation from rhombohedral to tetragonal under the application of an electric field in the 〈001〉 direction.

Image of FIG. 7.
FIG. 7.

Comparison between the ECE obtained by direct and indirect measurements as a function of temperature for the 〈001〉-PMN-30PT single crystal with a 10 kV/cm electric field applied in the 〈001〉 direction. The horizontal dotted line marks the line of zero electrocaloric effect.

Image of FIG. 8.
FIG. 8.

Comparison between the ECE obtained by direct and indirect measurements as a function of applied electric field in the three different temperature regions.

Image of FIG. 9.
FIG. 9.

ECE as a function of applied electric field for the three different temperature regions by indirect measurement. Arrows indicate increasing temperature: from 60 °C to 90 °C for region I, from 97 °C to 125 °C for region II, and from 130 °C to 165 °C for region III.

Image of FIG. 10.
FIG. 10.

Polarization and corresponding ECE as a function of applied electric field at two different temperatures in region I: 85 °C (upper) and 90 °C (lower).

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/content/aip/journal/jap/111/12/10.1063/1.4730338
2012-06-22
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Direct and indirect electrocaloric measurements on 〈001〉-PbMg1/3Nb2/3O3-30PbTiO3 single crystals
http://aip.metastore.ingenta.com/content/aip/journal/jap/111/12/10.1063/1.4730338
10.1063/1.4730338
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