Small amount of the newly formed ash was taken in a long silica tube and was heated in vacuum for 4 at 5 h different temperatures 600, 700, 800, 900 and 1000 ºC.
Small amount of the newly formed ash wastaken in a long silica tube and was heated in vacuum for 4 at5 h different temperatures 600, 700, 800, 900 and 1000 ºC.