Structural, optical and magnetic characterizations of Mn-doped MgO nanoparticles

Azzaza, S.; El‐Hilo, M.; Narayanan, S. Sriman; Vijaya, J. Judith; Mamouni, N.; Benyoussef, A.; Kenz, A. El; Bououdina, M.

doi:10.1016/j.matchemphys.2013.12.006

Cited by 59 publications

(23 citation statements)

References 40 publications

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“…DRS of some NPs shows a slight absorption peak in the range of 260 to 280 nm, which is known as a specific one for the MgO NPs [40]. A broad shoulder, observed in the 270-350 nm wavelength region for some NPs (except NPs #3 and #5), probably, results from some defect structures [3]. In the NPs with maximum σ s , possible, large amounts of charged species are presented at the energy levels of local vacancies.…”

Section: Uv-vis Reflectance Spectramentioning

confidence: 92%

“…RTFM, reported in certain thin films and nanoparticles (NPs) of non-magnetic oxides, can be explained by the presence of defects on their surfaces [2]. While oxygen vacancy defects are believed to have a main effect on the ferromagnetic order in some oxide semiconductors, the origin of RTFM in insulators, such as MgO, is still unclear [3].…”

Section: Introductionmentioning

confidence: 99%

“…Nanoparticles, with their large surface-to-volume ratio, can be especially effective in producing various structural defects [3]. This is necessary to take in mind for the adequate comparison of data between samples prepared under different fabrication methods and synthesis conditions [6].…”

Section: Introductionmentioning

confidence: 99%

“…Q2) Page 2: Insert a reference related to the following sentence: "It is known, that the main advantage of using nanoparticles (which have the largest specific surface area) over those of films is the more accurate determining of specific magnetization values of the materials." A2: CORRECTED as: "Nanoparticles, with their large surface-to-volume ratio, can be especially effective in producing various structural defects [3]. This is necessary to take in mind for the adequate comparison of data between samples prepared under different fabrication methods and synthesis conditions [6]."…”

mentioning

confidence: 99%

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Effect of synthesis conditions on room-temperature ferromagnetic properties of Mg-O nanoparticles

Morozov

Sathasivam

Белоусова

et al. 2018

Journal of Alloys and Compounds

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Page 2: Considering the following sentence: "Experimentally RTFM has been observed in undoped MgO nanoparticles preferable synthesized by wet chemical routes", complete with: (see Table 1) A3: CORRECTED. 4) Page 2: Please, explain what the Author mean when they say: "the surface of such nanoparticles was not sufficiently clean" A4: CORRECTED as: "the surface of such nanoparticles could not sufficiently clean compared with NPs produced by gas-phase methods." Q5) Page 3: Substitute "metal magnesium" with "metallic magnesium" A5: "metal" is corrected to "metallic". 6) Page 4: Please, specify better the techniques that are used to evaluate the parameters listed in Table 2, or move the Table in the "Results and discussion" section A6: In page 4 the text was corrected as: "Some parameters of the NPs synthesis, including metal feed rates, gases flow rates, and corresponding collection zones are listed in Table 2. Table 2. Main properties of the Mg-O NPs. S-specific surface area obtained from BET measurements; -mean particle size obtained from SEM micrographs; y-MgO content and a-MgO lattice parameter obtained from XRD data; σ s-maximum specific magnetization (VSM, RT, 10 kOe)." 7) Page 5: As concerns the BET measurements, specify the measurements conditions (i.e., time, temperature, minimum pressure in outgassing procedure) A7: In the text on page 5 was added the sentence: "No outgassing procedures were applied before the BET measurements." 8) Page 6: Correct: "collected in the main zone" with "collected in the main zones" A8: CORRECTED. 9) Page 6: Considering the sentence: "In Figure 2a, NPs of about 50 nm in an average size is generally uniform cubes", please specify how the Authors evaluate the average size. From a first visual investigation, only the interval can be estimated. A9: In the text on page 5 written: "Particle size and morphology were investigated by scanning electron microscopy (SEM) using CARL ZEISS ULTRA PLUS. Electron micrographs were analyzed by Carl Zeiss AxioVision ver. 4.82 image processing software to calculate the average particle size ‹d› [22]." 10) Page 6: Author refer to the "Particle size distribution", but it is not reported. Did the Author evaluate the particles size distribution by SEM images? A10: Yes, see A12.

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Section: Uv-vis Reflectance Spectramentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Effect of synthesis conditions on room-temperature ferromagnetic properties of Mg-O nanoparticles

Morozov

Sathasivam

Белоусова

et al. 2018

Journal of Alloys and Compounds

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“…Doped rock-salt oxides (for example MgO) have been studied extensively [24][25][26][27][28][29][30][31][32][33][34][35] for their applications in optical and magnetic sensors, switching devices and as dilute magnetic semiconductors [36][37][38]. Apart from various chemical routes available for creating defects in MgO [38][39][40][41], there have been instances where MgO is implanted with different ions.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Site Preference of Implanted Transition Metal Dopants in Rock-salt Oxides

Misra

Yadav

2019

Sci Rep

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Transition metals (TMs) implanted in oxides with rock-salt crystal structures (for example MgO and BaO) are assumed to substitute cations (Mg in case of MgO) from the lattice sites. We show that not all implanted TMs substitute cations but can be stable in interstitial sites as well. Stability of TM (Sc–Zn) dopants in various charge states in MgO and BaO has been investigated in the framework of density functional theory. We propose an effective way to calculate stability of implanted metals that let us predict site preference (interstitial or substitution) of the dopant in the host. We find that two factors govern the preference for an interstitial site: (i) relative ionic radius and (ii) relative oxygen affinity of cation and the TM dopants. If the radius of the cation is much larger than TM dopant, as in BaO, TM atoms always sit at interstitial sites. On the other hand, if the radius of the cation is comparable to that of the dopant TM, as in case of MgO, the transition of the preferred defect site, from substituting lattice Mg atom (Sc to Mn) to occupying interstitial site (Fe to Zn) is observed. This transition can be attributed to the change in the oxygen affinity of the TM atoms from Sc to Zn. Our results also explain experiments on Ni and Fe atoms implanted in MgO. TM dopants at interstitial sites could show substantially different and new properties from substitutionally doped stable compounds.

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Structural and magnetic properties of copper oxide films deposited by DC magnetron reactive sputtering

et al. 2018

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Structural, optical and magnetic characterizations of Mn-doped MgO nanoparticles

Cited by 59 publications

References 40 publications

Effect of synthesis conditions on room-temperature ferromagnetic properties of Mg-O nanoparticles

Effect of synthesis conditions on room-temperature ferromagnetic properties of Mg-O nanoparticles

Prediction of Site Preference of Implanted Transition Metal Dopants in Rock-salt Oxides

Structural and magnetic properties of copper oxide films deposited by DC magnetron reactive sputtering

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