Table 5. Products of the Three Alumina Hydrates under Different Calcination Temperatures.

alumina hydrates	300 °C	550 °C	800 °C	1000 °C	1200 °C
bayerite	boehmite + η	η	η + θ	θ + α	α
PB	boehmite	γ	δ	θ	α
boehmite	boehmite	γ	δ	θ	α