Field-induced thermal response and irreversible phase transition enthalpy change in Pb(Mg₁<sub>/</sub>₃Nb₂<sub>/</sub>₃)O₃–PbTiO₃
Peräntie, J.; Hagberg, J.; Uusimäki, A.; Jantunen, H. (2009-03-12)
Peräntie, J., Hagberg, J., Uusimäki, A., Jantunen, H. (2009) Field-induced thermal response and irreversible phase transition enthalpy change in Pb(Mg1/3Nb2/3)O3–PbTiO3. Applied Physics Letters, 94 (10), 102903. doi:10.1063/1.3098067
© 2009 American Institute of Physics. Published in this repository with the kind permission of the publisher.
In order to determine the enthalpy change in an irreversible field-induced phase transition, the thermal response to an electric field in 0.87Pb(Mg₁/₃Nb₂/₃)O₃-0.13PbTiO₃ was measured and dismantled into characteristic dielectric hysteresis, reversible electrocaloric, and irreversible phase transition responses. Below the depolarization temperature Tdp = 18 °C, the phase transition enthalpy change increases rapidly to a maximum value of |ΔH| = 77 J / kg. Above Tdp, the field-induced thermal response shows a reversible nature with an increased electrocaloric effect. In addition to earlier enthalpy data presented for temperature-induced transitions, this letter provides information on the enthalpy change in a field-induced phase transition of relaxor ferroelectrics.
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