金属アルコキシド加水分解法によるTiO_2-SnO_2系結晶の合成(<小特集>セラミック材料小特集)

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The very fine oxide particles in TiO_2-SnO_2 System were prepared by the hydrolysis of titanium isopropoxide and tin isopropoxide in propanol solution. The following hydrolysis conditions were found to be necessary for the controlled synthesis of crystalline oxide precipitates, 1) process of water addition to propanol solution of metal isopropoxides, 2) the amount of water added to the metal isopropoxide solution, 3) hydrolysis time and aging time of the precipitate at boiling temperature (reflux time). The crystalline TiO_2 of anatase structure was precipitated by the hydrolysis of 0.05 mol/l titanium isopropoxide with the amount of water 300 times more of the equivalent value for the oxide formation and the subsequent reflux, while the decrease of the amount of water to 70 times of the equivalent value resulted in the formation of amorphous TiO_2. The crystalline phase of the precipitate changed depending on the amount of SnO_2 in the system. The precipitate of the composition Ti_<0.9>Sn_<0.1>O_2 was the mixture of anatase and rutile phases with the particle size of 50Å, and the increase of SnO_2 to x=0.2 in Ti_<1-x>Sn_xO_2 solid solution gave the oxide precipitate composed of only rutile phase with the particle size of 23〜25Å. On heating the precipitates, the grain of the anatase phase of TiO_2 precipitates grew significantly at about 630℃, at which the phase transformation from anatase to rutile phase took place. On the precipitates of rutile structure, grain growth seemed to be more constrained and the neck growth between the grains became remarkable with an increase of the amount of SnO_2.
社団法人日本材料学会の論文
1982-10-15

金属アルコキシド加水分解法によるTiO_2-SnO_2系結晶の合成(<小特集>セラミック材料小特集)

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