Formation, characterization and magnetic properties of maghemite γ-Fe2O3 nanoparticles in borate glasses

Optical response and magnetic characteristic of samarium doped zinc phosphate glasses containing nickel nanoparticles

“…7, it can be seen that the glass with x¼0 mol% of Ni NPs content demonstrates a similar M s value with x¼ 1.0 mol%. This is due to the difference in the surrounding of magnetic atoms which is contributed by the spin configuration in the core and surface area of magnetic particles [34]. This result is in agreement with the one obtained when samarium is doped with BiFeO 3 multiferroic materials [35].…”

“…Noteworthy, there is a difference between hysteresis loops measured in two regimes. It is found that, the saturation magnetization, M s of bulk nickel is comparatively much higher than the glass with Ni NPs due to the significance of the non-magnetic surfactant coated [32,33] and is attributed to the disorder canting spins (Spin-glass-like) on the surface of Ni NPs [21,34]. The results show that, the glass with x¼0 mol% of Ni NPs content reminiscent of ferromagnetic hysteresis loop, with remanence magnetization, M r of $ 2.6170.13 Â 10 À 3 emu/g and a coercive field, of $ 787.82739.39 Oe.…”

Ultrasonic and structural features of some borosilicate glasses modified with heavy metals

“…The structure of lead sodium borate glasses has received considerable attention due to its peculiarities [1,2]. These glasses have wide technological and industrial advantages when used in the fields of electronics [3], optical lenses with high refractive indices and low dispersion characteristics [4], transparent nuclear radiation shielding windows [5], solar energy technologies [6] and acoustic-optic devices [7,8].…”

Effect of gadolinium on magnetic circular dichroism and electron magnetic resonance of ε-Fe2O3 nanoparticles formed in borate glasses

“…The analysis of results described above allows to conclude that the characteristics of the magnetic nanoparticles arising in aluminoborate glasses modified with K 2 O and doped with Fe 2 O 3 and Gd 2 O 3 significantly differ from those of γ-Fe 2 O 3 nanoparticles in previously described glasses containing one more glass-forming oxide -GeO 2 -and doped with Fe 2 O 3 and different rare earth oxides including Gd 2 O 3 [19,51]. A number of properties of the nanoparticles in the glasses studied in this work are similar to those of ε-Fe 2 O 3 nanoparticles earlier described in the literature, see Introduction, viz., the reflections (133) and (335) in XRD patterns characteristic of ε-Fe 2 O 3 , strong magnetization and MCD increase with the decrease of temperature and higher coercivity in comparison with γ-Fe 2 O 3 nanoparticles mentioned above [19]. On the other hand, their coercivity is noticeably lower than that observed in most samples containing ε-Fe 2 O 3 nanoparticles [36,37].…”

“…Nanocrystals containing both hematite, α-Fe 2 O 3 and magnetite, Fe 3 O 4 phases have been detected in 16Na 2 O-10CaO-49SiO 2 -25Fe 2 O 3 glasses [18]. A formation of maghemite, γ-Fe 2 O 3 nanoparticles in a number of glasses has been reported [19].…”