Optical properties and theoretical study of Mn doped ZnAl2O4 nanoparticles with spinel structure

Optical and dielectric properties of silver-substituted ZnAl2O4 spinels synthesized using a sol-gel auto-combustion method

“…Knowing that the pure and doped ZnAl 2 O 4 compound has a direct transition, the value of the exponent n is 2, as in the literature. [30][31][32][33] Fig. 4 displays the plot of (F(R)hn) 2 versus photon energy (hn) for the samples Ag…”

Influence of Cr and Mn co-doping on the microstructure and optical properties of spinel structured Zn_0.95−<i>_x</i>Cr_0.05Mn<i>_x</i>Al₂O₄ nanoparticles

“…This implies the existence of Mn 3+ and Mn 2+ oxidation states. 2), 31) Figure 6(e) shows Cr2p 3/2 XPS spectra, there are two main peaks at 576.9 and 586.8 eV, which correspond to the binding energy between Cr 2p 3/2 and satellite peaks, respectively. The Cr 2p 3/2 XPS spectra can be fitted into three peaks at 573.5, 576.7 and 578.7 eV respectively.…”

“…30) Huang et al synthesized Zn 1¹x Mn x Al 2 O 4 (x = 0, 0.10, 0.20, 0.30 and 0.40) nanoparticles by hydrothermal method, found the average crystal size decreases, the lattice parameters increase and the band gap of doped samples decreases with the increase of Mn doping concentration. 31) Unfortunately, to the best of our knowledge, up to now, most of the studies focused on the physical properties of single transition metal ion doped metal oxide semiconductor, there are few studies on the effects of Cr and Mn co-doping on the microstructure and optical properties of spinel structure ZnAl 2 O 4 nanoparticles. Therefore, the main purpose of this study is to study the effect of Cr and Mn co-doping on microstructure and optical property.…”

Microstructure, doping and optical properties of Co2+:ZnAl2O4 transparent ceramics for saturable absorbers: Effect of the ZnF2 sintering additive

“…Spinels and, in particular, MgAl2O4, are attractive for doping with TM ions [6] such as Ni 2+ [7][8][9][10], Co 2 + [11], Mn 2+ [12][13][14][15][16], Fe 2+ [17][18][19] or Cr 3+ [20]. For MgAl2O4, one example is doping with divalent cobalt (Co 2+ ) ions replacing the Mg 2+ cations in Td sites and featuring broad absorption at ~1.5 μm [11].…”

“…According to literature data, powders synthesized by hydrothermal method [36], decomposition of sulphate salts [37,38], as well as mixing of powders of aluminium and zinc oxides [39,40] were used to fabricate ceramics. Recently, many works on the synthesis of powders have been published, among which are solgel synthesis [43], combustion synthesis [44][45][46][47][48], hydrothermal synthesis [14].…”