Barium titanate deposition

Barium titanate thin films can be deposited on various substances by treating with an aqueous solution containing barium salts and an alkanolamine-modifted titanate such as TYZOR TE (151). In a similar fashion, reaction of a tetraalkyl titanate with an alkah metal hydroxide, such as potassium hydroxide, gives oxyalkoxide derivatives (KTi O(OR) ), which can be further processed to give alkali metal titanate powders, films, and fibers (152—155). The fibers can be used as adsorbents for radioactive metals such as cesium, strontium, and uranium (156). 

M. Nagai, K. Yamashita, T. Umegaki and Y. Takuma, Electrophoretic Deposition of Ferroelectric Barium TiTanate Thick Films and Their Dielectric Properties J. Am. Ceram. Soc. 76 (1993) 253-255. 

Li J, Wu YJ, Tanaka H, Yamamoto T, Kuwabara M (2004) Preparation of a monodispersed suspension of barium titanate nanoparticles and electrophoretic deposition of thin films. J Am Ceram Soc 87 1578-1581... 

Yong JW, Li J, Tomomi K, Makoto K. Low-temperature synthesis of barium titanate thin film by nanoparticles electrophoretic deposition. J Electroceram 2008 21 189-92. 

Pyro-dad. Trade-name. A process for depositing multilayer coatings of metals and ceramics. (Aremco Products Inc. USA). Pyroelectric Materials. Pyroelectrics develop an observable spontaneous electric moment only when heated. Cf ferroelectrics. Pyroelectric ceramics include some niobate-zirconate systems, barium titanate modified with zirconia and hafnia, and lanthanum-modified lead... 

Hosokura, T., Sakabe, Y., and Kuwabara, M. (2005) Preparation of barium titanate with patterned microstructure by a novel electrophoretic deposition method. /. Sol-Gel Sci. TechnoL, 33, 221-228. 

Thin film ceramic materials with important magnetic, optical, electronic, and mechanical properties are often highly anisotropic. Thus, the ability to control orientation is critically important in thin film applications. For many of the oxide materials, as well as Ae ionic materials, aqueous solution or sol-gel routes are the most convenient or the only method of preparation. Examples of these include barium titanate (BaTiOs) used in multilayer capacitors, lead-zirconate-titanate (Pb(Zr,Ti)03, "PZT") used as a piezoelectric material, and zinc oxide (ZnO) used in varistors. Thus, the use of substrates to control orientation can eliminate major problems in deposition of thin films. In some cases, e.g., the many magnetic and non-magnetic phases of iron oxide, the ability to control the phase formed is critical to production of the desired properties. While this can be controlled by solution conditions, the proper surface can add an additional and very effective mechanism of control. 

Additional work on dielectrics includes deposition of silica, PABS (lead aluminum boron silicates), PLZT (lead lanthanum zirconium titanate) and BST (barium strontium titanate) on Si-Ti-Pt wafers (Figure 2). The wafer specimens were patterned with metal electrodes and electronic properties were characterized. 

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