Maghemite particle (fine size) was prepared from iron containing waste sources like scrap, mill scale and so on by precipitation-calcination method, using hydrochloric acid, sodium carbonate, sodium hydroxide..

We identified the first 3 wt losses, The first weight loss due to desorption of moisture and physisorption of water 2nd one, small amount chemisorb of water. 3rd… due to losss of water because of iron hydroxide bond breaking.. but last one .. couldn't.. so, need help regarding this..