Abstract
The spinel ZnFe2O4 specimens were obtained via a hydrothermal and a ceramic method, respectively, and their structural and magnetic properties were comparatively studied. It was found that all the specimens exhibited a single-phase and mixed spinel structure. The magnetism of specimens synthesized via the hydrothermal method is obviously better than that of specimen prepared via the ceramic method. This can be ascribed to the different occupancy of Fe ions resulted from the loss of Zn during the hydrothermal process.
Highlights
The spinel structure with a formula of AB2O4 is widely studied and used in the fields of electronics, magnetism, catalyst, energy storage and so on [1,2,3,4,5,6,7,8]
ZFO without any other impurity peaks is revealed in the three XRD patterns, indicating their single-phase spinel ZFO structure (PDF#22-1012) in the space group Fd-3m
The characteristic absorption bands at around 450 cm-1 and 575 cm-1 can be ascribed to the bending or stretching vibrations of A-O4 and B-O6 in spinels, which is consistent with the results in previous reports [10, 20], suggesting the formation of spinel structure
Summary
The spinel structure with a formula of AB2O4 is widely studied and used in the fields of electronics, magnetism, catalyst, energy storage and so on [1,2,3,4,5,6,7,8]. Spinel ferrites (AFe2O4) are usually used as the magnetically soft materials, such as MgFe2O4[6], MnFe2O4[7], NiFe2O4 [8] and so on Their magnetic properties are related to the site occupancy of cations. If partial Fe3+ ions in B sites are forced to locate in A sites, the magnetism in ZFO could transform from antiferromagnetism to ferrimagnetism. This is instructive to the study of magnetism in spinel structures, and the magnetism in ZFO aroused the interest of some researchers [16,17,18]. We prepared the ZFO specimens via a hydrothermal method and a traditional ceramic method, respectively, and proved that the Zn-deficiency can cause the transition of magnetism from antiferromagnetism to ferrimagnetism in ZFO
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