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Microscopic interpretation of sign reversal in the electrocaloric effect in a ferroelectric PbMg1/3Nb2/3O3-30PbTiO3 single crystal
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10.1063/1.4794543
/content/aip/journal/apl/102/10/10.1063/1.4794543
http://aip.metastore.ingenta.com/content/aip/journal/apl/102/10/10.1063/1.4794543
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic, not to scale, showing the three different phases, resulting dipole moments and the corresponding five entities describing the entropy changes from polarization and phase changes with corresponding free energy barriers uoa-aT and uob-bT.

Image of FIG. 2.
FIG. 2.

(a) and (b): The model (2a) describing the trends of field induced negative electrocaloric compared with experimental results (2b) of the same temperature region and applied field. The non-zero interaction parameters (in units of k) are: J11  = J22  = J33  = J44  = J45  = J54 = −900, J12  = J21  = J34  = J43  = 900, and J55  = −1.35 · 103. The dipole moments are μa = 0.6 · 10−28 cm and μb = 0.95 · 10−27 cm. The free energy coefficients a and b are 1.65 k and 5.6 k, respectively, and the energy barriers uoa and uob are 700 k and 3000 k, respectively.

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/content/aip/journal/apl/102/10/10.1063/1.4794543
2013-03-11
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Microscopic interpretation of sign reversal in the electrocaloric effect in a ferroelectric PbMg1/3Nb2/3O3-30PbTiO3 single crystal
http://aip.metastore.ingenta.com/content/aip/journal/apl/102/10/10.1063/1.4794543
10.1063/1.4794543
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