Origin of Orientation in Sol‐Gel‐Derived Lead Titanate Films

Abstract

The origin of orientation in sol-gel-derived PbTi03 films is investigated in detail. Aging of the solution is found to promote (100) orientation of the films. Characterizing the solution by viscometry indicates that the preferred orientation might be attributable to the change of molecular size in the solution. The substrate also influences the film orientation: more strongly (100)-oriented film forms on Pt-coated Si than on fused quartz. Highly c-axis-oriented films with azimuthal orientation are grown on a (100) SrTiO, single-crystal disk.

Sintering of sol-gel films

“…Similarly, Kushida et al [42] found that the degree of orientation of lead titanate films varied with the compatibility of the substrate, increasing in the order: fused silica < (Pt on Si) << (SrTiO3 single crystal); the silica and silicon substrates yielded (100) orientation, but the strontium titanate produced epitaxial (00k) orientation. The connection between the orientation of the film and that of the substrate is clearly illustrated by a study by Tani and Payne [62].…”

“…Similar results were obtained by Kato et al [41 ], where the film consisted of acicular zirconia crystals. Kushida et al [42] find that the orientation of their lead titanate films increases with the age of the sol, and attribute this to the growth of longer linear chains that are easier to align. Such orientation is commonly observed in films of chainlike organic polymers, such as gelatin [43].…”

Processing Technologies for High‐Permittivity Thin Films in Capacitor Applications

“…PZT‐based thin films that are deposited on Pt electrodes typically acquire the texture of the underlying electrode, but several groups have shown that varying the thermal profile used for crystallization can result in significantly different texture of the PZT film 133–142 . One example of this is shown in Fig.…”

Growth mode of sol-gel derived PLT seeding layers on glass substrates and its effect on templating the oriented growth of PLZT thin films

“…4-7 PLT can also enhance epitaxial growth of PLZT films on sapphire. [10][11][12][13] However, systematical studies on the processing parameters are less available yet. [9][10][11] The orientation degree of the films derived from sol-gel process was strongly dependent on size and aspect ratio of gel particles, concentration of the sol-gel solution, film thickness and pyrolysis, etc.…”