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Conversion Process of Strontium–Titanium Bimetallic Methoxyethoxide Precursor into SrTiO 3 via Hydrolysis/Calcination
Author(s) -
Okayama Junko,
Takaya Itaru,
Nashimoto Keiichi,
Sugahara Yoshiyuki
Publication year - 2002
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2002.tb00434.x
Subject(s) - calcination , hydrolysis , bimetallic strip , inorganic chemistry , amorphous solid , chemistry , titanium , nuclear chemistry , catalysis , materials science , chemical engineering , organic chemistry , engineering
The conversion of a Sr–Ti bimetallic methoxyethoxide precursor into SrTiO 3 via hydrolysis and/or calcination was investigated. Hydrolysis with various water/metal molar ratios ( r H ; r H = 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 r H ≤ 2. At r H ≥ 8, SrTiO 3 was crystallized without calcination. Both the hydrolyzed and unhydrolyzed precursors ( r H = 0, 0.5, 2) were calcined in dry air at 550°–800°C. SrTiO 3 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.