Premium
Effects of pH and Temperature on Sol‐Gel Processing within the Pbo‐TiO 2 System
Author(s) -
Lee MoonHo,
Park YoungHo,
Yang CheulKee
Publication year - 1987
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.1151-2916.1987.tb04945.x
Subject(s) - calcination , sol gel , titanium tetrachloride , amorphous solid , chemistry , nuclear chemistry , titanium , inorganic chemistry , materials science , crystallography , nanotechnology , catalysis , organic chemistry
Effects of sol formation temperature and pH value on sol‐gel processing within the PbO‐TiO 2 system were investigated. PbO‐TiO 2 gels were prepared from the mixed solution of lead nitrate and titanium tetrachloride at 30° to 70°C under various pH values of 1.0 to 10.8, and dehydrated at 60° to 80°C for 72 h under vacuum. The dried gels are amorphous. The crystalline phases of the products after calcination at 70°C for 1 h in air are dependent upon the sol formation conditions as follows: (l)TiO 2 :30°C, pH 1.0 to 4.6; and 40° C, pH l.0 to 2.O. (2) PbTi 3 O 7 :50° to 70°C, pH 1.0 to 4.6. (3) PbTiO 3 : 70°C, pH 8.0 to 10.8. (4) PbTiO 3 and traces of PbTi 3 O 7 : 30° to60°C, pH 7.1 to 10.8.