• S T Alone

      Articles written in Pramana – Journal of Physics

    • Measurement of atomic number and mass attenuation coefficient in magnesium ferrite

      R H Kadam S T Alone G K Bichile K M Jadhav

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      Pure magnesium ferrite sample was prepared by standard ceramic technique and characterized by X-ray diffraction method. XRD pattern revealed that the sample possess single-phase cubic spinel structure. The linear attenuation coefficient (𝜇), mass attenuation coefficient ($\mu/\rho$), total atomic cross-section ($\sigma_{\text{tot}}$), total electronic cross-section ($\sigma_{\text{ele}}$) and the effective atomic number ($Z_{\text{eff}}$) were calculated for pure magnesium ferrite (MgFe2O4). The values of 𝛾-ray mass attenuation coefficient were obtained using a NaI energy selective scintillation counter with radioactive 𝛾-ray sources having energy 0.36, 0.511, 0.662, 1.17 and 1.28 MeV. The experimentally obtained values of $\mu/\rho$ and $Z_{\text{eff}}$ agreed fairly well with those obtained theoretically.

    • Structural and magnetic properties of zinc- and aluminum-substituted cobalt ferrite prepared by co-precipitation method

      S T Alone K M Jadhav

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      Spinal ferrites having the general formula Co$_{1-x}$Zn$_{x}$Fe$_{2-x}$Al$_{x}$O4 ($x = 0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6$) were prepared using the wet chemical co-operation technique. The samples were annealed at 800°C for 12 h and were studied by means of X-ray diffraction, magnetization and low field AC susceptibility measurements. The X-ray analysis showed that all the samples had single-phase cubic spinel structure. The variation of lattice constant with Zn and Al concentration deviates from Vegard's law. The saturation magnetization $\sigma_{s}$ and magneton number $n_{B}$ measured at 300 K using high field hysteresis loop technique decreases with increasing 𝑥, suggesting decrease in ferrimagnetic behaviour. Curie temperature $T_{C}$ deduced from AC susceptibility data decreases with 𝑥, suggesting a decrease in ferrimagnetic behaviour.

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