Account for Mutual Influence of Electrical, Elastic, and Thermal Phenomena for Ferroelectric Domain Wall Modeling

Starkov, A. S.; Pakhomov, O. V.; Starkov, Ivan A.

doi:10.1080/00150193.2013.773854

Cited by 9 publications

(2 citation statements)

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“…When considering the inter action of four fields (the temperature, electric, mag netic, and elastic ones), there exist 12 of these effects. Some of them are listed in [21]. They include, for example, the thermopolarization effect [22] describ ing the influence of the temperature gradient on the polarization.…”

Section: Allowance For the Gradient Termsmentioning

confidence: 99%

“…For example, the second equal ity in (3) should be replaced with the more general one (19) Since the derivatives with respect to the tempera ture in the free energy under consideration are absent, the entropy can be found from the first formula in (3) as before, but the total derivative (20) should be understood as the derivative with respect to the temperature. The entropy differential in this case is (21) Given the expression for the differential of the function X i, j , the formulas for the changes in entropy in an isothermal process and in temperature in an adi abatic process caused by the gradient terms in the free energy follow from this equation:…”

Section: Allowance For the Gradient Termsmentioning

confidence: 99%

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Multicaloric effect in a solid: New aspects

Starkov

2014

J. Exp. Theor. Phys.

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The multicaloric effect that is the result of interaction between various caloric effects has been studied theoretically. The effects attributable to the pairwise interactions of fields (piezomagnetocaloric, piezoelectrocaloric, and magnetoelectrocaloric effects) have been added to the previously known electroca loric, magnetocaloric, and elastocaloric effects that exist when the electric, magnetic, and elastic fields change. These new effects are shown to be determined by the temperature dependence of the piezomagnetic (magnetostrictive), piezoelectric (electrostrictive), and magnetoelectric coefficients. According to the esti mates obtained, the change in entropy in an isothermal process under the magnetoelectrocaloric effect for Cr 2 O 3 is 2-5 mJ kg -1 K -1 . The caloric effects caused by the influence of the gradient in one of the fields on other fields are shown to contribute to the multicaloric effect. One of these gradient effects, the flexocaloric one, which consists in a change in temperature and/or entropy when a strain gradient is applied or removed, has been studied in detail as an example. It follows from the derived formulas that the greatest values of this effect should be expected for materials with strong temperature dependences of the flexocaloric coefficient, permittivity, or permeability. The change in temperature calculated from experimental data for a PMN fer roelectric is estimated as 2-6 mK at a strain gradient of 1 m -1 . The interaction between fields of a different nature is known to lead to the synergetic effect, and the multicaloric effect can reach values that are com monly called giant ones, expanding considerably the possible domains of its application.

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Section: Allowance For the Gradient Termsmentioning

confidence: 99%