Abstract
Polycrystalline samples of cation-deficient FeAl2O4 spinel with Fe3+ ions and vacancies on both octahedral and tetrahedral sites have been investigated by electron spin resonance (ESR). For samples annealing at 1100° C and slightly oxidized (⩽0.16 wt % Fe3+), the ESR spectrum originates from Fe3+ ions located in trigonally distorted octahedral sites ofα-Al2O3 formed during the annealing and also from Fe3+ ions introduced by oxidation at low temperature in octahedral sites of spinel structure. The samples with concentration between 0.16 and 1.6 wt % Fe3+ show the majority of Fe3+ ions to be on tetrahedral sites and the rhombic symmetry around the Fe3+ ions is attributed to the presence of cation vacancies.
Sign-in/Register to access full text options 
Free) 
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 call
