Influence of Mn doping on structural and magnetic properties of Ti1−xMnxO2

Ahmed, Sohail

doi:10.1007/s10854-016-4741-9

Cited by 10 publications

(5 citation statements)

References 40 publications

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“…On the other hand, the number of BMPs that were determined from M 0 and m eff values is on the order of 10 15 per cm 3 . However, the number of BMPs was found to be consistent with previously published data .…”

Section: Resultssupporting

confidence: 91%

“…Figure depicts the XRD patterns of the Ti 1−x Cu x O 2 (x = 0.02, 0.04, and 0.06) samples annealed at 500°C (TC2, TC4, and TC6) as well as the TiO 2 :0.02Cu samples annealed at 600 and 700°C (TC2‐600 and RTC2‐700), along with the pattern of dopant‐free TiO 2 as a reference. It can be seen that the dominant crystal phase was the rutile‐type, in addition to a very small amount of diffraction lines attributed to anatase‐type . Detailed XRD analysis also revealed a slight shifting of the diffraction peaks towards the lower angles for the Cu‐doped samples compared to the dopant‐free TiO 2 .…”

Section: Resultsmentioning

confidence: 94%

“…TiO 2 is a well‐known wide‐band‐gap semiconductor for the production of DMSs. However, there has been a variety of research into replacing magnetic metals into TiO 2 . RTFM has been detected in some of these systems, but the RTFM source is often controversial and sometimes contradictory, especially concerning the role that could be played by magnetic impurities (such as Fe, Co, and Ni) that are not exposed .…”

Section: Introductionmentioning

confidence: 99%

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Structural, optical, and magnetic properties of Cu‐doped TiO₂ samples

Ahmed

2017

Crystal Research and Technology

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We report here the microstructure, optical, and magnetic properties of Cu-doped TiO 2 (Ti 1−x Cu x O 2 ) nanopowder samples with x = 0.02, 0.04, and 0.06 prepared by a solid-state reaction method. XRD studies indicated the incorporation of Cu into the TiO 2 lattice. Ultraviolet-visible spectroscopy (UV-vis) measurements revealed that the band gap decreased due to the incorporation of Cu. Photoluminescence (PL) results showed an enhanced photoluminescence property associated with oxygen vacancies from TiO 2 due to the incorporation of Cu. Magnetic investigations demonstrated that all of the samples had room temperature ferromagnetism (RTFM). RTFM was observed in the Ti 0.98 Cu 0.02 O 2 samples annealed at 500°C and reduced RTFM was clearly observed in the samples annealed at high temperatures of 600 and 700°C. Furthermore, the saturation magnetic moment decreased with increasing Cu content for the samples annealed at 500ᴼC with different doping Cu contents, due to the increased Cu atoms occupying neighbouring cation lattice sites, which resulted in an antiferromagnetic configuration. The results demonstrated that defects and/or oxygen vacancies, and the distances between nearest-neighbour Cu atoms, have a significant influence on ferromagnetism in Cu-doped TiO 2 powder samples.

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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Structural, optical, and magnetic properties of Cu‐doped TiO₂ samples

Ahmed

2017

Crystal Research and Technology

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“…For rutile D decreased from 124 to 22.5 nm. Analogous observation of the influence of Mn-doping on crystallite nanosize of TiO 2 matrices was also found in previous articles [18,24,25,28,29]. This reduction in the crystallite sizes might be attributed to the lattice distortion caused by the difference in ionic radii of Mn cations (herein Mn 2+ and Mn 3+ ) and Ti 4+ ions which limits the growth rate [18,25,28,29].…”

Section: Structural Xrd Resultssupporting

confidence: 80%

“…However, Mn 3+ could only be detected as Mn 2 O 3 in case of x= 0.1. Therefore, it can be pointed out that the lattice unit expansion is mainly due to the larger Mn 2+ ions which were successfully incorporated into the titania lattice crystallographic structure at the Ti 4+ sites [3,24,25]. The slight increase observed thereafter is reasonably attributed to the coexistence of Mn 2+ and Mn 3+ ions.…”

Section: Structural Xrd Resultsmentioning

confidence: 98%

Sol‒gel synthesis, structure, ferromagnetism and optical properties of Mn‒doped titania diluted magnetic semiconductors nanoparticles

2022

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Diluted magnetic semiconductors composed of Ti 1-x Mn x O 2 nanoparticles, where x ranges from 0.0 to 0.1, were synthesized utilizing the sol-gel processing. X-ray diffraction (XRD), high resolution transmission electron microscopy, ultravioletvisible (UV-Vis) diffuse reflectance spectroscopy (DRS) and vibrating sample magnetometry (VSM) were used for structural, optical and magnetic characterization of the prepared nanomaterials. XRD revealed the coexistence of nanosized anatase and rutile phases with no secondary phase up to x= 0.07. When x= 0.1, a minority of secondary Mn 2 O 3 phase was detected. It was also found that increasing x, i.e. increase of Mn content, increased the anatase content at the expense of rutile, increased the cell parameters of both of anatase and rutile, and decreased the average crystallite nanosize of both of them. UV-Vis DRS absorption spectra exhibited peaks around 415-435 and 515 nm which corresponded to Mn 2+ and Mn 3+ ions, respectively. The band gap (E opt ) values suggest the semiconducting behavior for all the investigated compositions. E opt significantly decreased with increasing Mn concentration. VSM results indicated that pure titania is diamagnetic. While, all the studied Mn-doped TiO 2 compositions exhibited room temperature ferromagnetism. However, weaker ferromagnetism, shown by increased unsaturation, was observed with increasing Mn content.

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