The phase relationship of Na+-beta-aluminas synthesized by a sol-gel process in the ternary system Na2O-Al2O3-Li2O
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Na+-β"-alumina was synthesized by a sol-gel process in the ternary system Li2O-Na2O-Al2O3. In order to research the phase formation of Na+-β"-alumina by varying the composition and calcination temperature in the range of pH 1-9, the sodium concentration was varied within the molar ratio range, [Na2O] : [Al2O3] = 1 : 4-1 : 8, and the calcination temperature was varied between 1100-1500 oC. The phase fraction of Na+-β"-alumina indicated a tendency to increase continually to 1500 oC. It was shown that up to about 88% in the molar ratio of [Na2O] : [Al2O3] = 1 : 5, the transient eutectic liquid in the Li2O-Na2OAl2O3system at about 1460 oC promoted the transformation of β-alumina to β"-alumina at higher temperatures. The average particle size of the synthesized powder was 300-500 nm.
Abstract
Na+-β"-alumina was synthesized by a sol-gel process in the ternary system Li2O-Na2O-Al2O3. In order to research the phase formation of Na+-β"-alumina by varying the composition and calcination temperature in the range of pH 1-9, the sodium concentration was varied within the molar ratio range, [Na2O] : [Al2O3] = 1 : 4-1 : 8, and the calcination temperature was varied between 1100-1500 oC. The phase fraction of Na+-β"-alumina indicated a tendency to increase continually to 1500 oC. It was shown that up to about 88% in the molar ratio of [Na2O] : [Al2O3] = 1 : 5, the transient eutectic liquid in the Li2O-Na2OAl2O3system at about 1460 oC promoted the transformation of β-alumina to β"-alumina at higher temperatures. The average particle size of the synthesized powder was 300-500 nm.
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