Effect of Cr and Mn ions on the structure and magnetic properties of GaFeO{sub 3}: Role of the substitution site

Effect of substitution of Cr and Mn in the Fe and Ga sites of GaFeO{sub 3} on the structural parameters and magnetic properties has been investigated by preparing GaFe{sub 1-x}Cr{sub x}(Mn{sub x})O{sub 3} and Ga{sub 1-x}Cr{sub x}(Mn{sub x})FeO{sub 3} starting with appropriate oxide precursors. It is...

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Bibliographic Details
Published in:Journal of solid state chemistry 2011-09, Vol.184 (9)
Main Authors: Saha, Rana, Shireen, Ajmala, Shirodkar, Sharmila N., Waghmare, Umesh V., Sundaresan, A., Rao, C.N.R.
Format: Article
Language:English
Subjects:
CATIONS
CHALCOGENIDES
CHARGED PARTICLES
ELEMENTS
FERRIMAGNETIC MATERIALS
FERRITES
GALLIUM COMPOUNDS
GALLIUM OXIDES
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
IONS
IRON COMPOUNDS
IRON OXIDES
MAGNETIC MATERIALS
MAGNETIC PROPERTIES
MAGNETIZATION
MANGANESE IONS
MATERIALS
METALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SPECIFICITY
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
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Summary:Effect of substitution of Cr and Mn in the Fe and Ga sites of GaFeO{sub 3} on the structural parameters and magnetic properties has been investigated by preparing GaFe{sub 1-x}Cr{sub x}(Mn{sub x})O{sub 3} and Ga{sub 1-x}Cr{sub x}(Mn{sub x})FeO{sub 3} starting with appropriate oxide precursors. It is shown that, starting with Cr or Mn substituted Ga{sub 2}O{sub 3}, one obtains Ga{sub 1-x}Cr{sub x}(Mn{sub x})FeO{sub 3}, while reaction of Cr or Mn substituted {alpha}-Fe{sub 2}O{sub 3} with Ga{sub 2}O{sub 3} yields GaFe{sub 1-x}Cr{sub x}(Mn{sub x})O{sub 3}. The structural parameters and magnetic properties vary significantly with the substitution site of Cr showing a large decrease in the unit cell parameters as well as the T{sub C} and other magnetic properties when the substitution is at the octahedral Fe (1, 2) site. Substitution of Cr at the octahedral Ga2 site results in marginal changes. Substitution of Mn in the Ga and Fe sites also show differences although the changes themselves are much smaller. First-principles calculations confirm such site-specificity and show how Cr substitution affects the properties differently when substituted at the Ga2 and Fe1 sites. - Graphical abstract: The important role of site-specific substitution of transition metal ions on the structure and magnetic properties of GaFeO{sub 3} has been investigated experimentally and theoretically. Highlights: > Substitution of transition metal ions to specific cation site. > Ionic radii of the cation dictate the disorder associated with the specific site. > Site-specificity explains magnetic ordering and structural parameters.
ISSN:0022-4596
1095-726X
DOI:10.1016/j.jssc.2011.07.006