INVESTIGATION OF THE DOUBLE-PHASE TRANSITION OF Tm3Fe5O12, BY EXAFS SPECTROSCOPYReport as inadecuate




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Abstract : Coprecipitated Thulium-iron hydroxides with garnet stoichiometry TmIG have been investigated at several annealing temperatures from 333 K to 1453 K using differential thermal analysis DTA, x-ray diffraction XRD and EXAFS at the LIII edge of Tm. Two phase transitions at 1043 K and 1091 K are observed by DTA. XRD proves that the crystallization of TmIG is completed at 1091 K. The analysis of the nearest neighbour shell of the EXAFS data shows the presence of three temperature regions separated by the two phase transitions. The different oxide geometries in these regions are elucidated by EXAFS fits.





Author: H. Beuthien D.V. Ahlften W. Girnus A. Torkler W. Gunsser W. Niemann

Source: https://hal.archives-ouvertes.fr/



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