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The swung gel fibers were heated to 400 ℃ at 0.5, 1, 1.5, 2, 2.5, 3 and 4 ℃·min-1 of heating rate, respectively, and soaked for 1 h; then heated to 600 ℃ at 3 ℃·min-1 of heating rate and soaked for 1 h; at last calcined at 1 000, 1 100, 1 200, 1