Effect of (Li, Mn) co-doping on structural, optical and magnetic properties of chunk-shaped nano ZnO

The effect of growing time and Mn concentration on the defect structure of ZnO nanocrystals: X-ray diffraction, infrared and EPR spectroscopy

“…39 The symmetric and asymmetric -CH 2 stretching modes locate between 2800 cm À1 and 3000 cm À1 . 40 While the characteristic bands of 3500-3800 cm À1 were corresponded to stretching vibration of H 2 O, the observed bands at 1072 cm À1 and 1030 cm À1 were attributed to the bending vibrations of -OH groups. 41 The peak at 1131 cm À1 is ascribed to O-H stretching vibration of H 2 O in Mn-Zn-O lattice.…”

“…39 The symmetric stretching occurs between 818 cm À1 and 956 cm À1 and corresponds to the vibration of (NO 3 ) À1 ions. 40 The characteristic FT-IR peaks in the region below 1000 cm À1 is very important to understand the presence of Zn-O bond and the functional groups. Since, the vibrational modes of the metal-oxygen are expected in this region.…”

Effect of Annealing on the Structural and Magnetic Properties of 3% Sm Doped ZnO

“…Therefore, the RTFM in pure ZnO rods are due to the Zn vacancies induced spin polarization [26]. [29][30][31] indicate occurrence of ferromagnetic ordering in nanocrystals of nonmagnetic solids and ions [29] (Zn 2+ and O 2− ) due to surface defects. Although there is a possibility of presence of Zn interstials and oxygen vacancies at surface of undoped ZnO nanocrystals, these defects are not large enough to induce ferromagnetism in undoped ZnO nanocrystals [30].…”

Role of Mn/Cr dual-doped ZnO nanoparticles of diluted magnetic semiconductors: influence on structural and electrical properties

“…Different methods were used to synthesize transitionmetal-doped ZnO nanoparticles, including the wet-chemical technique [16], co-precipitation routine [17], sol-gel [18], pulsed laser deposition [19], and radio frequency magnetron sputtering [20]. Sol-gel is one of these technologies that is getting popular because it has various advantages, including low processing temperatures, the ability to adjust particle size and morphology, excellent chemical homogeneity, low cost, and simplicity [21][22][23] The AC conductivity and dielectric characteristics of semiconductors are helpful to recognize the presence of defect centers and the nature of conduction in the crystalline materials.…”