Magnetic behaviour of "Lithiated" Fe2TiO5

Özet

Fe2TiO5 shows a spin glass transition at 53 K and is mainly known for its semiconducting nature. A 'LiAl' pair is incorporated in Fe2TiO5 by high temperature solid-state reaction. Fe2TiO5 + xLiAlH4 $frac {1000^circ C}{24 hrs in atmosphere} Fe2Ti_{1-x}(LiAl)x O5 x < x The presence and quantity of "LiAl" is confirmed by Inductively Coupled Argon Plasma (IACP)technique. The crystalline geometry is determined by X- ray diffraction and Fourier Transform Infrared (FTIR) spectroscopy of powders. It remains orthorhombic pseudobrookite. Certain reflections of Fe2TiO5 are observed to enhance progressively with the content of "LiAl". The magnetic hysteresis parameters are observed to depend on the content of "LiAl". Initial susceptibility and permeability are measured as a function of temperature. The magnetic order is discussed and explained. It is concluded that the pseudobrookite possesses a 'spinel like network', which is strengthened by incorporation of "LiAl". It produces a weak long-range ferrimagnetic order in place of short-range antiferromagnetic order. Possible applications are discussed in the text.