Structure and Optical Characteristics of Barium–Strontium Niobate Films on Al2O3 Substrates

The structure and optical characteristics of thin films of relaxor ferroelectric Ba 0.5 Sr 0.5 Nb 2 O 6 grown by RF sputtering in an oxygen atmosphere on an Al 2 O 3 substrate ( c cut) have been studied. X-ray diffraction analysis shows that Ba 0.5 Sr 0.5 Nb 2 O 6 films are c -oriented and unit-cell...

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Bibliographic Details
Published in:Optics and spectroscopy 2019-05, Vol.126 (5), p.487-491
Main Authors: Pavlenko, A. V., Kara-Murza, S. V., Korchikova, A. P., Tikhii, A. A., Stryukov, D. V., Kovtun, N. V.
Format: Article
Language:English
Subjects:
Aluminum oxide
Barium
Crystals
Ellipsometry
Ferroelectric materials
Ferroelectricity
Lasers
Mesostructures
Metamaterials
Optical Devices
Optical properties
Optics
Optics of Low-Dimensional Structures
Photonics
Physics
Physics and Astronomy
Relaxors
Substrates
Thin films
Transition layers
Unit cell
X-ray diffraction
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Summary:The structure and optical characteristics of thin films of relaxor ferroelectric Ba 0.5 Sr 0.5 Nb 2 O 6 grown by RF sputtering in an oxygen atmosphere on an Al 2 O 3 substrate ( c cut) have been studied. X-ray diffraction analysis shows that Ba 0.5 Sr 0.5 Nb 2 O 6 films are c -oriented and unit-cell parameter c is 3.948(1) Å. Ellipsometric measurements confirm that SBN-50 films are characterized by a natural growth direction, which coincides with the direction of the optical crystal axis. An analysis of ellipsometric results shows that there is no transition layer at the film/substrate interface; the damaged layer on the free film surface is 7.5 nm thick, and the volume filling factor is estimated to be 0.625.
ISSN:0030-400X
1562-6911
DOI:10.1134/S0030400X19050229