We have synthesized and isolated a number of unique niobium alkoxide compounds and introduced them into novel solution processes for the production of lead magnesium niobate oxide (PMN) and niobium-doped lead zirconate titanate oxide (PNZT) materials. A more sterically demanding analogue to Nb(OEt)5 (Et = CH2CH3) was isolated as [Nb(μ-OEt)-(ONp)4]2 (1, Np = CH2C(CH3)3) by alcoholysis exchange. 1 crystallized in an edge-shared bioctahedral dinuclear arrangement with the smaller ligands acting as the bridging moieties. Multidentate ligands such as bis(hydroxymethyl)propionic acid (BHMP-H3) and tris-(hydroxymethyl)ethane (THME-H3) were independently reacted with Nb(OEt)5 to reduce the number of terminal ligands, yielding [(μ-BHMP)Nb2(μ-O)(OEt)5]2 (2) and [(μ-THME)-Nb(OEt)2]2 (3) respectively. For 2, two unsymmetrical "(EtO)2Nb(μ-O)Nb(OEt)3" units are bridged by two tetradentate BHMP ligands. The THME moiety of 3 acts as a chelating, unidentate-bridging ligand forming a symmetrical dinuclear species, wherein each Nb atom possesses two terminal ethoxides. The synthesis, characterization, structural aspects, and solution properties of 1-3 are reported. The resulting morphological and electrical changes in the properties of the resulting electroceramic PMN and PNZT films due to the incorporation of these Nb alkoxides are also reported.
|Original language||English (US)|
|Number of pages||12|
|Journal||Chemistry of Materials|
|State||Published - Dec 1 1997|
ASJC Scopus subject areas
- Chemical Engineering(all)
- Materials Chemistry