Sintering and grain growth behaviour of magnesium aluminate spinel: Effect of lithium hydroxide addition

• Using LiOH, as a sintering aid, reduces the activation energy of MgAl 2 O 4 from 790 kJ.mol ?1 to 510 . Reactions between magnesium aluminate spinel and LiOH yield secondary phases that prevent grain growth. There is critical concentration ca. 0.3 wt%, above which growth promoted. The due preferential incorporation Li + Lithium hydroxide, in amounts ranging 0.1 1.2 wt% has been used aid improve densification addition promotes limits sintering, calculated using master curve approach, decreases ± 20 with LiOH. In addition, was also mixed 10 amplify formation reaction products. High-temperature XRD results showed (MgO LiAlO ) are produced 1040 °C. start disappear at T > 1200 °C, produced. While adding small up beneficial for suppressing growth, there exists accounted by lithium ions into crystal lattice.