Abstract
Abstract The structural and magnetic properties of 5(Fe2O3)−3(Al2O3)−(Ga2O3)−(SiO) have been investigated using Mossbauer spectroscopy and x-ray diffraction. The X-ray diffraction pattern shows that the crystal structure is of a cubic spinel type. The lattice constant (a= 8.324 A ) has been found by extrapolation using the Nelson-Riley function and it decreases slightly with Ga concentration although the Ga3+ ions are larger than the Al3+ ions, which can be attributed to a higher degree of covalency in Ga-O bonds than in Al-O and Fe-O bonds, which can also be explained with the help of the observed Mossbauer parameters. The zero-field Mossbauer spectra at 50K ≤ T ≤ 750K are various and anomalous as shown in Fig.2,3. The spectra at low temperature consist of two sextets which are identified to arise from Fe3+ ions at tetrahedral(A−) sites and octahedral(B−) sites, of two sextets and a doublet for R.T. ≤ T ≤ 600K. The central lines are asymmetric. This asymmetry can be ascribed to the preferred orientation of crystallites because of the temperature independence of the asymmetry.
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.
