Abstract
Mossbauer studies of Fe 3+ ions on Si-gel, Al 2 O 3 and a natural zeolite mineral natrolite, treated with Fe(NO 3 ) 3 and FeCl 3 solutions and subsequently heated in steps upto 950°C, have been carried out to study the adsorption and change of chemical species caused by thermal treatment. It is inferred that iron ions exist as superparamagnetic particles of α-FeOOH on all the surfaces studied upto 200°C. Further heating to 400°C, transforms it partly into fine particles of α-Fe 2 O 3 , the conversion however, becoming complete by 600°C. At 800–950°C, Fe 3+ enters the Al 2 O 3 lattice substitutionally, while in the case of Si-gel, α-Fe 2 O 3 particles register an increase in crystallite size only. In the case of natrolite, there results particles of α-Fe 2 O 3 with size greater than 150 A, when heated to 800–950°C.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
