Synthesis of nano-sized alpha alumina using solvothermal and hydrothermal methods: A comparative study

Alumina (Al₂O₃) is an aluminium compound with many crystalline forms or polymorphs. Alpha alumina is the only stable form amongst the different polymorphs. The biggest usage of alpha alumina is the electronic sector that accounts for 64.7% of the total advanced ceramics applications in year 2005 [1]. A majority of this is in the form of alumina capacitors, insulator and also packaging materials. Another important usage of alumina is as ceramic and structural material such as industrial nozzle, synthetic biomaterial, cutting tools, abrasive, etc. Alpha alumina stable at very high temperature and this property is also used as refractory and thermal barrier.