Niobium ethoxide

To confirm this mechanistic feature and to examine the interaction between the niobium ethoxide species and the postadsorbed molecule, various electron-donating compounds were postadsorbed on the surface that had been preadsorbed with the same amount of ethanol, Si0 2Nb(=0)(0H)(0C2H5)... 

Lithium niobate is a ferroelectric material used as an optical switch. Preparation by the simple ceramic method leads to problems in obtaining the correct stoichiometry, and a mixture of phases often results. Several sol-gel preparations have been described, their advantage being the lower temperature required for the preparation and the greater homogeneity of the product. One such preparation starts with lithium ethoxide (LiOC2H5 (or LiOEt)) and niobium ethoxide Nb2(OEt)io. Each ethoxide was dissolved in absolute ethanol and the two solutions mixed. The addition of water leads to partial hydrolysis giving hydroxy-alkoxides, for example ... 

Niobium ethoxide or niobium oxalate was used to graft niobium on calcined as well as exchanged mesoporous MCM-41 and MCM-48 molecular sieves. Similar procedure was used as described for titanium grafting using titanium butaoxide. 

Niobium ethoxide [Nb(0C2H5)g] has traditionally been used as a precursor Tor the preparation oT supported niobium oxide catalysts. This non-aqueous preparation... 

Supports and Catalysts. The preparation of the supports used in this study was discussed in detail elsewhere. The two phosphate supports, A O AIPO and 4MgO lSA O 10A1P0 were co-precipi-tated using the necessary nitrate salts, phosphoric acid, and ammonium hydroxide at a fixed pH (.] ) Niobia was precipitated by adding ammonium hydroxide to a methanolic solution of niobium chloride (8). The niobia-silica support was prepared by impregnating SiO (Davison 952) to incipient wetness with a hexane solution of niobium ethoxide. The sample was then dried and calcined to obtain a homogeneous surface phase oxide (9). 

Piazza, G.J., T.A. FogUa, andA. Nunez, Enantioselective Conversion of Linoleate Hydroperoxide to an a,P-Epoxy Alcohol by Niobium Ethoxide, J. Am. Oil Chem. Soc. 75 939-943 (1998). 

Nb20s Niobium ethoxide Ethanol Acetic acid PVAc Viswanathamurthi et al. (2003b)... 

Yogo et al. have reported a UV patterning process for alkoxy-derived lithium niobate film (Yogo et al, 1995). Benzoylacetone was selected as a ligand on an alkoxide precursor for the sensitive absorption of UV light. Lithium ethoxide and niobium ethoxide were used as starting materials. Patterned lithium niobate films with preferred c-axis orientation were crystallized on sapphire substrates by a heat treatment at 550 C. 

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