Spectroscopic Studies of Alkoxide Precursors for the Synthesis of Ba(Mg_(1/3) Ta_(2/3))O_3

摘要

~1H and ~(13)C Fourier transform-nuclear magnetic resonance (FT-NMR) and mass spectrometric (MS) techniques were used to prove the structures of precursors used in the sol-gel synthesis of the high-frequency dielectric Ba(Mg_(1/3)Ta_(2/3))O_3. Various metal methoxyethoxides (MEO) of Ba, Ta, Mg-Ta and Ba-Mg-Ta systems were prepared in 2-methoxyethanol (MeOFtOH). The tantalum and the magnesium-tantalum precursors were determined to be Ta_2(MEO) to and MgTa_2(MEO)_(12), respectively. Similar spectroscopic studies for "Ba_3MgTa_2(MEO)_(15)" indicated that the Ba-Mg-Ta alkoxide precursor has a polymer structure of (Ba,Mg,Ta)(MEO) complex and contains the bridging alkoxy groups between Ta and the alkaline earth metals.