Surface state on first-order ferroelectrics

Chew, Khian Hooi and Halif, M.N.A. and Osman, J. and Tilley, D.R. and Teh, R. and Ishibashi, Y. (2006) Surface state on first-order ferroelectrics. European Physical Journal B, 52 (1). pp. 143-150. ISSN 1434-6028, DOI

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In the presence of a surface the Landau-Devonshire equations of ferroelectricity must be extended to include a boundary condition. For a ferroelectric with a second-order transition in the case when the polarization p(z) increases at the surface, it is well known that a surface state occurs in a range of temperature above the bulk critical temperature t(CB) . Here we explore the corresponding effect for a first-order ferroelectric. We show that a surface state can occur, but only if the surface effect is sufficiently strong. Analytic expressions are derived and illustrated for p(z), the surface value p(S) =p(0) and the free energy. The transition from the paraelectric state (p=0) to the surface state is first order, and for completeness we establish the dependence of the three critical temperatures (supercooling, thermodynamic and superheating) on a boundary-condition parameter y. In a final section, we derive and illustrate expressions for p(z)in the temperature range t < t(CB) .

Item Type: Article
Additional Information: Department of Physics, Faculty of Science Building, University of Malaya, 50603 Kuala Lumpur, MALAYSIA
Uncontrolled Keywords: Susceptibility tensor components, Phase-transitions, Landau theory, Films, Batio3, Computations, Particles
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Department of Physics
Depositing User: Miss Malisa Diana
Date Deposited: 29 Jul 2013 01:53
Last Modified: 27 Aug 2019 07:25

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