Abstract
Variable temperature scanning surface potential microscopy is used to determine thermodynamic and kinetic parameters associated with polarization screening on BaTiO3(100) surfaces. The temperature dependence of the surface potential is indicative of the interplay between the fast dynamics of atomic polarization and slower dynamics of screening charge. The screening charge relaxation kinetics are found to be weakly dependent on temperature with activation energy Ea∼4 kJ/mole. Equilibrium domain potential difference depends linearly on temperature; the zero potential contrast is observed at ∼110 °C. At room temperature the sign of domain potential is determined by the screening charges rather than polarization charge. A thermodynamic model for screening of ferroelectric surfaces based on Ginzburg–Devonshire theory is developed so that the enthalpy and entropy of charge compensation can be derived from the temperature dependence of surface potential contrast. In the case of BaTiO3 in air, the charge compensation mechanism is surface adsorption.
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Dates
Type | When |
---|---|
Created | 23 years, 1 month ago (July 26, 2002, 9:26 a.m.) |
Deposited | 1 year, 6 months ago (Feb. 5, 2024, 2:54 p.m.) |
Indexed | 3 weeks, 4 days ago (Aug. 2, 2025, 12:39 a.m.) |
Issued | 23 years, 5 months ago (March 15, 2002) |
Published | 23 years, 5 months ago (March 15, 2002) |
Published Print | 23 years, 5 months ago (March 15, 2002) |
@article{Kalinin_2002, title={Domain polarity and temperature induced potential inversion on the BaTiO3(100) surface}, volume={91}, ISSN={1089-7550}, url={http://dx.doi.org/10.1063/1.1446230}, DOI={10.1063/1.1446230}, number={6}, journal={Journal of Applied Physics}, publisher={AIP Publishing}, author={Kalinin, Sergei V. and Johnson, C. Y. and Bonnell, Dawn A.}, year={2002}, month=mar, pages={3816–3823} }