1981 Volume 89 Issue 1027 Pages 134-139
The moisture absorption, potassium extraction and thermal behavior of K2Ti4O9 fibers grown from various starting temperatures of slow cooling by the flux method are investigated.
The fibers obtained from the high starting temperature of 1200°C or 1100°C have the large content of absorbed moisture, the small extractability of K+ ions in a dilute acid solution, the small amount of interlayer water and bound water which dehydrate at high temperature in comparison with them grown from the low starting temperature of 1000°C.
The thermal behavior of hydrated titania fibers prepared by extracting K+ ions from the various K2Ti4O9 fibers mentioned above was also examined. The dehydration behavior of them resembles to that of the original K2Ti4O9 phases. In addition, during the heating of them originated from the high starting temperature, an inversion to an intermediate phase were represented by a sharp exothermic peak, and continuously, a transformation to anatase phase occurred to begin at relatively low temperature.
The relationship between fabrication histories and the differences of chemical properties of K2Ti4O9 fibers is based on the temperature dependence of flux growth reaction, especially, on the differences of crystal size and quality.
