Title :
Structure and magnetic properties of Gd1-xSrxFeO3-δ
Author :
Kim, Chul Sung ; Um, Young Rang ; Park, Seung Iel ; Ji, Sang Hee ; Oh, Young Jei ; Park, Jae Yun ; Lee, Sung Joo ; Yo, Chul Hyun
Author_Institution :
Dept. of Phys., Kookmin Univ., Seoul, South Korea
fDate :
11/1/1994 12:00:00 AM
Abstract :
The perovskite type Gd1-xSrxFeO3-δ (x=0.0, 0.25, 0.5, 0.75 and 1.0) system has been studied by X-rays, Mohr´s salt analysis, and Mossbauer spectroscopy. From the results of X-ray diffraction measurement the structure of the Gd1-xSrxFeO3-δ system is orthorhombic with x values of 0.0, 0.25 and 0.5, and cubic with the x values of 0.75 and 1.0. Mossbauer spectra of Gd1-xSrx FeO3-δ have been taken at various temperatures ranging from 13 to 800 K. Analysis of Mossbauer spectra for this system demonstrated the existence of the mixed valence states of iron and the coordination state of Fe3+ and Fe4+ ions. The Neel temperature decreases linearly with Sr concentration, suggesting that the superexchange interaction for Gd-O-Fe link is stronger than that for Sr-O-Fe link
Keywords :
Mossbauer effect; Neel temperature; crystal structure; gadolinium compounds; mixed valence compounds; strontium compounds; superexchange interactions; 13 to 800 K; GdSrFeO3; Mohr´s salt analysis; Mossbauer spectroscopy; Neel temperature; Sr concentration; X-ray diffraction; cubic; mixed valence states; orthorhombic; perovskite; superexchange interaction; IEL; Iron; Magnetic properties; Materials science and technology; Physics; Solids; Spectroscopy; Strontium; Temperature; X-ray diffraction;
Journal_Title :
Magnetics, IEEE Transactions on
