A study of some properties for substituted Li-ferrite using positron annihilation lifetime technique

作者：Aly E Hassan; Samy A M^*

来源：Results in Physics, 2015, 5: 80-84.

DOI：10.1016/j.rinp.2015.03.001

• Li-ferrite
• Ceramics
• Positron annihilation
• Initial permeability
• Electric resistivity

Positron annihilation lifetime spectroscopy (PALS) is used to investigate polycrystalline substituted Li-ferrite samples. The dray ceramic technique was used to prepare all investigated samples. The variation of positron annihilation parameters I-1%, I-2%, tau(1), and tau(2) has been demonstrated with porosity and the initial permeability against the ionic radii of substituted ions for Li ferrite. The grain size (G.S.) increased with increasing the ionic radii of the substituted ions for Li-ferrite. The correlation between I-2 and tau(2) has opposite behavior with the ionic radii of the substituted ions. Whereas the correlation between I-1 and tau(1); has nearly the same behavior with the ionic radii of the substituted ions except for V and Gd samples. There is mostly a direct correlation between the electrical resistivity and I-2 values except for Sm sample with increasing the ionic radii of substituted ions.

• 出版日期2015