Conversion Process of Strontium?Titanium Bimetallic Methoxyethoxide Precursor into SrTiO<sub>3</sub>via Hydrolysis/Calcination
作者:Junko Okayama、Itaru Takaya、Keiichi Nashimoto、Yoshiyuki Sugahara
DOI:10.1111/j.1151-2916.2002.tb00434.x
日期:2002.9
The conversion of a Sr–Ti bimetallic methoxyethoxide precursor into SrTiO3 via hydrolysis and/or calcination was investigated. Hydrolysis with various water/metal molar ratios (rH; rH= 0.5, 2, 4, 6, 8, 10) in tetrahydrofuran at reflux resulted in a decrease in the amount of the methoxyethoxyl groups, and the hydrolyzed products were soluble with rH≤ 2. At rH≥ 8, SrTiO3 was crystallized without calcination. Both the hydrolyzed and unhydrolyzed precursors (rH= 0, 0.5, 2) were calcined in dry air at 550°–800°C. SrTiO3 was crystallized on calcination at ≥550°C from amorphous materials with a considerable loss of carbon, which was present as both chars and carbonate ions.