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Title: Electro-optic properties of epitaxial Sr0.6Ba0.4Nb2O6 films grown on MgO substrates using LixNi2-xO buffer layer
Authors: Li, XT
Du, PY
Ye, H
Mak, CL 
Wong, KH
Issue Date: 2008
Source: Applied physics. A, Materials science & processing, 2008, v. 92, no. 2, p. 397-400
Abstract: Textured LixNi2-xO (LNO) thin films have been fabricated on (001)MgO substrates by pulsed laser deposition technique. The as-deposited LNO films shows a conductivity of 2.5 x 10(-3) Omega m and possess a transmittance of about 35% in the visible region. Subsequent deposition of Sr0.6Ba0.4Nb2O6 (SBN60) thin film on these LNO-coated MgO substrates resulted in a textured SBN layer with a < 001 > orientation perpendicular to the substrate plane. Phi scans on the (221) plane of the SBN layer indicated that the films have two in-plane orientations with respect to the substrate. The SBN unit cells were rotated in the plane of the film by +/- 8.2 degrees as well as +/- 45 degrees with respect to the LNO/MgO substrate. Besides the highly (00l)-orientation, the SBN films also exhibited a dense microstructure as shown by scanning electron microscopy. The electro-optic coefficient (r(33)) of the SBN film was measured to be 186 pm/V. On the basis of our results, we have demonstrated that the LNO film can be used as a buffer layer as well as a transparent bottom electrode for waveguide applications. The SBN/LNO heterostructure is also a suitable candidate for integrated electro-optics devices.
Publisher: Springer
Journal: Applied physics. A, Materials science & processing 
ISSN: 0947-8396
EISSN: 1432-0630
DOI: 10.1007/s00339-008-4537-8
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