Abstract
A single-source molecular precursor [Ba4Hf2(μ6-O)(μ3,η2-OR)8(μ-OR)2(μ-ROH)4Cl4] (ROH = CH3OCH2CH2OH) for mixed-metal oxide materials was prepared via elimination of the cyclopentadienyl ring from Cp2HfCl2 as CpH, in the presence of Ba(OR)2 in an alcohol ROH as a source of protons. The precursor was characterized by elemental analysis, infrared (IR) and nuclear magnetic resonance (NMR) spectroscopy, and single-crystal X-ray structural analysis. This complex undergoes thermal decomposition at 800 °C to a BaCl2/BaHfO3 mixture. After barium dichloride has been leached from the raw powder using deionized water, the resulting particles are of submicrometer size (30–50 nm). Preliminary studies of barium hafnate doped with Eu3+ sintered at 900 °C showed that a dominant luminescence band belongs to the strong electric dipole transition 5D0→7F2.
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