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Realization of high tunability barium strontium titanate thin films by rf magnetron sputtering (1999)

Padmini, P. ; Taylor, T. R. ; Lefevre, M. J. ; [et al.]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 75 (1999), S. 3186-3188

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ISSN: 1077-3118

Source: AIP Digital Archive

Topics: Physics

Notes: Ferroelectric thin films are currently being used to develop tunable microwave circuits based on the electric-field dependence of the dielectric constant. (Ba0.5Sr0.5)TiO3 (BST) films prepared by sputtering on Pt/TiO2/SiO2/Si substrates are found to exhibit a capacitance change (tunability) of nearly 4:1. Higher tunability has been attributed to the (100) texturing of the BST films and is a result of the biaxial tensile stress imposed by Si on BST making the polar axis oriented in plane. Electrical characterization shows that the dielectric permittivity increases with increase in film thickness (up to ∼200 nm). © 1999 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.125272

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Phase equilibria of charged lamellar phases: Effect of adding surfactants with sugar headgroups on interbilayer repulsions (1997)

Ricoul, F. ; Dubois, M. ; Zemb, T. ; [et al.]

Springer

Colloid & polymer science 105 (1997), S. 351-359

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ISSN: 1435-1536

Keywords: Glycolipid ; didodecyldimethylammonium bromide ; phase diagram ; concentration gradient ; mixed micelles ; critical demixion

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Abstract The ternary phase diagram of the water/2-O LauroylSaccharose (LS)/didodecyl dimethyl ammonium bromide (DDAB) is determined versus temperature using an extension of the gradient method. Three phase equilibria regions are localized. The existence of these phase equilibria is due to a combination of electrostatic effects and steric effects. The high surface charge density of the double chain surfactant (DDAB) and the large polar volume of the single chain added surfactant (LS) induce coexisting repulsive mechanisms of steric and electrostatic origin which are directly measured using vapor pressure experiments. Critical demixtion of two lamellar phases formerly observed by temperature variation, can also be induced by adding LS.