Characterization of (Ba0.5Sr0.5)TiO3 thin films for Ku-band phase shifters

Publication Type:

Journal Article

Authors:

C.H. Mueller; F.W. Van Keuls; R.R. Romanofsky; F.A. Miranda; J.D. Warner; C.L. Canedy; Ramamoorthy Ramesh

Source:

Integrated Ferroelectrics, Taylor and Francis Inc., Volume 28, Number 1-4, p.139-149 (2000)

Keywords:

Barium compounds, Crystal microstructure, Dislocations (crystals), ferroelectricity, Film crystallinity, High resolution X ray diffractometry, Interfaces (materials), lanthanum compounds, Lanthanum strontium oxides, Paraelectric films, Phase shifters, Strain, thin films

Abstract:

The microstructural properties of (Ba0.5Sr0.5)TiO3 (BSTO) thin films (300, 700, and 1400 nm thick) deposited on LaAlO3 (LAO) substrates were characterized using high-resolution x-ray diffractometery. Film crystallinity was the parameter that most directly influenced tunability, and we observed that a) the crystalline quality was highest in the thinnest film and progressively degraded with increasing film thickness; and b) strain at the film/substrate interface was completely relieved via dislocation formation. Paraelectric films such as BSTO offer an attractive means of incorporating low-cost phase shifter circuitry into beam-steerable reflectarray antennas. © 2000 OPA (Overseas Publishers Association) N.V. Published by license under the Gordon and Breach Science Publishers imprint.

Notes:

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