Structural Investigation on Ti^<3+> Ion in Soda-silicate Slag(MATERIALS METALLURGY AND WELDABILITY)

概要

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State of titanium ion in soda silicate slags was investigated by optical absorption and electron spin resonance (ESR) spectroscopies in order to clarify the effect of titanium ion in slag on the properties of weld metal and spolling property of slag in welding process. An optical absortion with a shoulder was observed at about 20,000 cm^<-1> in the slags produced under the reducing condition (Po_2=2.1×10^<-9> atm.). ESR absorption was also observed near g=1.924 in these slags. These absortions were assigned to Ti^<3+> ions in an octahedral environment with tetragonal distortion. The observations of another optical absorption near 8,300 cm^<-1> and appearance of a shoulder near g=1.985 suggested that there exists Ti^<3-> ions in an octahedral environment with trigonal distortion in high silica content. Based on the structural consideration of silicate slag, it is indicated that tetragonally and trigonally distorted environments arise from the octahedrally coordination of free and non-bridged oxygens to Ti^<3+> ions, that is, Ti^<3+> O^-_<6-n> O^<2->_n units, and the former environment is due to Ti^<3-> O^-_4 O^<2->_2 and Ti^<3+> O^-_5 O^<2-> units.
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