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- W3113110788 abstract "Zirconia gels, precipitated at pH4, 6, 8 and 10 from zirconyl chloride solutions, have been calcined at temperatures up to 1200/sup 0/C and the products investigated by nitrogen adsorption and thermogravimetric, DTA and X-ray diffraction techniques. The apparent surface area, pore volume and average pore size increased with pH of precipitation. Crystallization occurred at 390 to 420/sup 0/C yielding the monoclinic phase (pH 10 sample), the metastable tetragonal phase (pH 4 sample) or a mixture of the two (pH 6 and 8 samples). There was no relationship between the average crystallite size and the existence of the metastable phase. Increasing the calcination temperature of the pH 10 gel brought about a decrease in the surface area, resulting largely from the extensive crystallite growth, and an increase in the average size of the intercrystallite pores. Sintering of the crystallites also occurred, however, and an estimate of the grain boundary area as a function of calcination temperature was obtained from the crystallite and BET surface areas." @default.
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- W3113110788 date "1979-01-01" @default.
- W3113110788 modified "2023-09-26" @default.
- W3113110788 title "Calcination of zirconia gels" @default.
- W3113110788 hasPublicationYear "1979" @default.
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