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Structure‐Optical Property Correlation of Epitaxial Potassium Niobate Thin Films Deposited on Magnesium Oxide (100) Substrates Using a Strontium Titanate Transition Layer
Author(s) -
Gopalan Venkatraman,
Raj Rishi
Publication year - 1995
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1995.tb08895.x
Subject(s) - materials science , orthorhombic crystal system , epitaxy , potassium niobate , strontium titanate , thin film , substrate (aquarium) , pulsed laser deposition , layer (electronics) , diffraction , analytical chemistry (journal) , ferroelectricity , mineralogy , crystal structure , crystallography , optics , optoelectronics , dielectric , nanotechnology , chemistry , oceanography , physics , chromatography , geology
Epitaxial thin films of orthorhombic KNbO 3 (100)/(010) were deposited on MgO (100) single‐crystal substrates by pulsed laser ablation using an ε120 Å SrTiO 3 (110) transition layer in between. From X‐ray diffraction, the orientation relationships were determined as (010) [100] or (100) [010] KNb0 3 ∥ (110) [110] SrTiO 3 ∥ (100) [011] MgO and (010) [001] or (100) [001] KNbO 3 ∥ (110) [001] SrTiO 3 ∥ (100) [011] MgO. The measured film refractive indices at 632.8 nm were 2.213 ± 0.003, 2.278 ± 0.003, and 2.285 ± 0.003, respectively, along MgO [100], [011], and [011] directions. A model was developed to correlate the measured effective refractive indices of the film to area fractions of domain variants in the film. Using the model, the area fraction of domains with their polarization axis normal to the substrate was estimated to be 60.0 ± 2.7%.