Journal
APPLIED PHYSICS LETTERS
Volume 77, Issue 11, Pages 1695-1697Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1308531
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A series of heteroepitaxial Ba0.6Sr0.4TiO3 were grown on 0.29(LaAlO3):0.35(Sr2TaAlO6) substrates using pulsed-laser deposition. X-ray characterization revealed compressive in-plane stresses in the thinnest films, which were relaxed in a continuous fashion with increasing thickness. A theoretical treatment of the misfit strain was in good agreement with the measured out-of-plane lattice parameter. The low-frequency dielectric constant was measured to be significantly less than the bulk value and found to decrease rapidly for films less than 100 nm. A thermodynamic model was developed to understand the reduction in dielectric constant. By observing the microstructure using plan-view and cross-section transmission electron microscopy, we identified local strain associated with a threading dislocation density on the order of 10(11) cm(-2) as a possible mechanism for dielectric degradation in these films. (C) 2000 American Institute of Physics. [S0003-6951(00)00937-2].
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