Journals / Turkish Journal of Physics / 2005 / Cilt: 29 - Sayı: 1
Magnetic Behaviour of ``Lithiated'' Fe2TiO5
- Journal
- Turkish Journal of Physics
- Pages
- 25–31
- DOI
- —
Abstract
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 °C}{24 hrs in atmosphere} \to Fe2Ti1-x (LiAl)xO5 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.
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 °C}{24 hrs in atmosphere} \to Fe2Ti1-x (LiAl)xO5 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.