Investigation of Crystal Structure,Electrical and Magnetic Properties of Spinel Mn-Cd Ferrite Nanoparticles

Journal of Inorganic and Organometallic Polymers and Materials - Cd1 ? xMnxFe2O4 (x?=?0, 0.25, 0.5, 0.75, 1) spinel ferrite nanoparticle samples were synthesized...     

Preparation and optical properties of borate glass doped with MnO<Subscript>2</Subscript>

In this contribution, MnO₂ doped borate glass matrix with ratios 0.0, 0.5, 1.0, 1.5 and 2.0 wt% were prepared utilizing melting method. The structural characterization of these glass samples was performed via X- ray diffraction measurements. Optical absorption analyses within the 200–1000 nm wavelength range were performed to characterize the samples. The direct and indirect optical energy gaps (E_opt) decreased however Urbach energy (E_U) increased with increasing MnO₂ concentration. The refractive index, and optical conductivity values are observed to increase with increasing MnO₂ concentration. FTIR spectra of borate glass doped with 0.0, 0.5, 1.0, 1.5 and 2.0 wt% MnO₂ revealed the presence of absorption bands due to Mn²⁺.     

Synthesis,physical, optical,mechanical, and radiation attenuation properties of TiO2–Na2O–Bi2O3–B2O3 glasses

A series of bismo-borate (50-x)B₂O₃-xTiO₂-15Na₂O–30Bi₂O₃ glass samples (where x = 0, 2.5, 5, 7.5, and 10 wt%) doped with TiO₂ were fabricated via the melt-quenching technique. The gamma and neutron shielding, physical, optical, and mechanical properties of the prepared samples were investigated. The experimental results were measured using an HPGe detector. ¹⁵²Eu, ¹³³Ba, ¹³⁷Cs, and ⁶⁰Co radioactive sources were used with energies in the range of 81–1408 keV. The experimental results were compared with both the FLUKA code and the XCOM database. The addition of TiO₂ increased the density of the glass samples and decreased their molar volume. The mass attenuation coefficient (MAC) decreased as photon energy decreased, while it increased as TiO₂ concentration increased. The half value layer (HVL) and mean free path (MFP) of the glass samples increased when the photon energy increased and decreased as the TiO2 concentration increased. The absorbance of the present samples is enhanced by using TiO₂, meaning they can be used to protect humans from UV light. Both direct and indirect band gaps decreased as TiO₂ content increased from 0 to 10 wt %. Moreover, the electronic transition between localized states is valid in the present samples. The radiation shielding, optical, physical, and mechanical properties of the fabricated glass samples demonstrate their utility for diagnostic gamma shielding.     

Responsibility of Bi2O3 Content in Photon,Alpha, Proton,Fast and Thermal Neutron Shielding Capacity and Elastic Moduli of ZnO/B2O3/Bi2O3 Glasses

The effect of Bi₂O₃ content on photon, alpha particle, proton, fast and thermal neutron shielding capacity, and elastic moduli of 10ZnO-(90-x)B₂O₃-xBi₂O₃ (ZBB-glasses): x?=?25–50 mol% has been investigated. The mass density and Bi-content of the ZBB-glasses had the greatest impact on the values of mass and linear attenuation coefficients. The mass and linear attenuation coefficients values were followed the trend (ZBB25)_MAC,LAC?<?(ZBB30) _MAC,LAC?<?(ZBB35) _MAC,LAC?<?(ZBB40) _MAC,LAC?<?(ZBB45) _MAC,LAC?<?(ZBB50) _MAC,LAC. The mean free path (MFP) and half value layer (HVL) were having the same trend and opposite to which obtained in mass and linear attenuation coefficients. All the ZBB-glasses showed almost similar charged particle shielding capacity. However, ZBB50 had a comparable charged particle absorption efficiency. There was a 57% growth in fast neutron removal cross section as Bi₂O₃ molar concentration increased to 50% in the ZBB-glass matrix. ZBB50 possesses the highest fast neutron removal cross section among the ZBB-glasses. In terms of thermal neutron absorbing capacity, the presence of B in the glass matrix ensures that the ZBB-glasses are good thermal neutron absorption. ZBB25 has the highest thermal neutron absorption capacity among the investigated glasses. Generally, ZBB-glasses can be adopted for photon, thermal neutron, proton, and alpha particle shielding purposes. In addition, elastic (shear, longitudinal, and Young’s) moduli and Poisson’s ratio are changed significantly with the increase of Bi₂O₃ content mol% in ZBB-glasses.

     

A comprehensive study on crystal structure,magnetic, and electrical properties of Ni-doped Fe–Cd spinel nano-ferrites

Journal of Materials Science: Materials in Electronics - The flash auto-combustion method was used to synthesize nanocrystalline spinel ferrites with the general formula Cd1?xNixFe2O4...