Author(s):
Jyoti Shah and R K Kotnala
Abstract:
Room temperature ferromagnetism has been induced in antiferromagnetic GdFeO3 by
substituting titanium at Gd site Gd1-xTixFeO3 (x=0.00 - 0.25). Perovskite GdFeO3 has been synthesized
at lower temperature by chemical co-precipitation. Titanium substitution in gadolinium orthoferrite
has transformed the perovskite phase to garnet phase confirmed by X-ray diffraction analysis.
Tolerance factor of perovskite structure has been reduced from 0.81 to 0.78 for x=0.25 Ti substitution.
Antiparallel G-type electron spins of GdFeO3 has been distorted by structural change induced due to
titanium substitution. Ferromagnetism has been increased to 0.74 emu/g from 0.5 emu/g by titanium
substitution. Retentivity and coercivity has been also increased from 0.005 emu/g to 0.28 emu/g and
27 Oe to 218 Oe respectively. The increase in magnitude of ferromagnetic transition with respect of
temperature has been significantly observed by high temperature magnetization measurement. Present
process is easy to induce room temperature ferromagnetism in antiferromagnetic GdFeO3 by distorting
the structure at lower temperature by titanium substitution. The retentivity and coercivity produced at
x=0.25 titanium substitution is useful for magnetic memory and switching application.
Pages: 46-50
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