TY - JOUR
T1 - Nanocasting of mesoporous In-TM (TM = Co, Fe, Mn) oxides: Towards 3D diluted-oxide magnetic semiconductor architectures
AU - Pellicer, Eva
AU - Cabo, Moisés
AU - Rossinyol, Emma
AU - Solsona, Pau
AU - Suriñach, Santiago
AU - Barõ, Maria Dolors
AU - Sort, Jordi
PY - 2013/2/18
Y1 - 2013/2/18
N2 - Transition metal (Co, Fe, Mn)-doped In2O3-y mesoporous oxides are synthesized by nanocasting using mesoporous silica as hard templates. 3D ordered mesoporous replicas are obtained after silica removal in the case of the In-Co and In-Fe oxide powders. During the conversion of metal nitrates into the target mixed oxides, Co, Fe, and Mn ions enter the lattice of the In2O3 bixbyite phase via isovalent or heterovalent cation substitution, leading to a reduction in the cell parameter. In turn, non-negligible amounts of oxygen vacancies are also present, as evidenced from Rietveld refinements of the X-ray diffraction patterns. In addition to (In 1-xTMx)2O3-y, minor amounts of Co3O4, α-Fe2O3, and Mn xOy phases are also detected, which originate from the remaining TM cations not forming part of the bixbyite lattice. The resulting TM-doped In2O3-y mesoporous materials show a ferromagnetic response at room temperature, superimposed on a paramagnetic background. Conversely, undoped In2O3-y exhibits a mixed diamagnetic-ferromagnetic behavior with much smaller magnetization. The influence of the oxygen vacancies and the doping elements on the magnetic properties of these materials is discussed. Due to their 3D mesostructural geometrical arrangement and their room-temperature ferromagnetic behavior, mesoporous oxide-diluted magnetic semiconductors may become smart materials for the implementation of advanced components in spintronic nanodevices. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
AB - Transition metal (Co, Fe, Mn)-doped In2O3-y mesoporous oxides are synthesized by nanocasting using mesoporous silica as hard templates. 3D ordered mesoporous replicas are obtained after silica removal in the case of the In-Co and In-Fe oxide powders. During the conversion of metal nitrates into the target mixed oxides, Co, Fe, and Mn ions enter the lattice of the In2O3 bixbyite phase via isovalent or heterovalent cation substitution, leading to a reduction in the cell parameter. In turn, non-negligible amounts of oxygen vacancies are also present, as evidenced from Rietveld refinements of the X-ray diffraction patterns. In addition to (In 1-xTMx)2O3-y, minor amounts of Co3O4, α-Fe2O3, and Mn xOy phases are also detected, which originate from the remaining TM cations not forming part of the bixbyite lattice. The resulting TM-doped In2O3-y mesoporous materials show a ferromagnetic response at room temperature, superimposed on a paramagnetic background. Conversely, undoped In2O3-y exhibits a mixed diamagnetic-ferromagnetic behavior with much smaller magnetization. The influence of the oxygen vacancies and the doping elements on the magnetic properties of these materials is discussed. Due to their 3D mesostructural geometrical arrangement and their room-temperature ferromagnetic behavior, mesoporous oxide-diluted magnetic semiconductors may become smart materials for the implementation of advanced components in spintronic nanodevices. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
KW - diluted magnetic semiconductors
KW - indium oxide
KW - magnetic properties
KW - mesoporous oxides
KW - nanocasting
U2 - 10.1002/adfm.201201486
DO - 10.1002/adfm.201201486
M3 - Article
VL - 23
SP - 900
EP - 911
JO - Advanced Functional Materials
JF - Advanced Functional Materials
SN - 1616-301X
ER -