scholarly journals Room temperature antiferromagnetic ordering in chemically prepared nanocrystalline Co-doped neodymium oxide (Nd1.90Co0.10O3-δ)

2018 ◽  
Vol 752 ◽  
pp. 448-454 ◽  
Author(s):  
B.J. Sarkar ◽  
M. Dalal ◽  
A. Mitra ◽  
J. Mandal ◽  
A. Bandyopadhyay ◽  
...  
Keyword(s):  
Room Temperature ◽  
Neodymium Oxide ◽  
Antiferromagnetic Ordering ◽  
Co Doped

Photoluminescence and Magnetic Properties of Undoped and (Mn, Co) co-doped ZnO Nanoparticles

2020 ◽  
Vol 16 (4) ◽  
pp. 655-666
Author(s):  
Mona Rekaby
Keyword(s):  
Magnetic Properties ◽  
Zno Nanoparticles ◽  
Room Temperature ◽  
Magnetic Measurements ◽  
Structural Defects ◽  
Ferromagnetic Behavior ◽  
Secondary Phases ◽  
Antiferromagnetic Ordering ◽  
Doped Zno ◽  
Co Doped

Objective: The influence of Manganese (Mn2+) and Cobalt (Co2+) ions doping on the optical and magnetic properties of ZnO nanoparticles was studied. Methods: Nanoparticle samples of type ZnO, Zn0.97Mn0.03O, Zn0.96Mn0.03Co0.01O, Zn0.95Mn0.03 Co0.02O, Zn0.93Mn0.03Co0.04O, and Zn0.91Mn0.03Co0.06O were synthesized using the wet chemical coprecipitation method. Results: X-ray powder diffraction (XRD) patterns revealed that the prepared samples exhibited a single phase of hexagonal wurtzite structure without any existence of secondary phases. Transmission electron microscope (TEM) images clarified that Co doping at high concentrations has the ability to alter the morphologies of the samples from spherical shaped nanoparticles (NPS) to nanorods (NRs) shaped particles. The different vibrational modes of the prepared samples were analyzed through Fourier transform infrared (FTIR) measurements. The optical characteristics and structural defects of the samples were studied through Photoluminescence (PL) spectroscopy. PL results clarified that Mn2+ and Co2+ doping quenched the recombination of electron-hole pairs and enhanced the number of point defects relative to the undoped ZnO sample. Magnetic measurements were carried out at room temperature using a vibrating sample magnetometer (VSM). (Mn, Co) co-doped ZnO samples exhibited a ferromagnetic behavior coupled with paramagnetic and weak diamagnetic contributions. Conclusion: Mn2+ and Co2+ doping enhanced the room temperature Ferromagnetic (RTFM) behavior of ZnO. In addition, the signature for antiferromagnetic ordering between the Co ions was revealed. Moreover, a strong correlation between the magnetic and optical behavior of the (Mn, Co) co-doped ZnO was analyzed.

Single–atom manganese and nitrogen co-doped graphene as low-cost catalysts for the efficient CO oxidation at room temperature

2021 ◽  
Vol 536 ◽  
pp. 147809
Author(s):  
Mingming Luo ◽  
Zhao Liang ◽  
Chao Liu ◽  
Xiaopeng Qi ◽  
Mingwei Chen ◽  
...  
Keyword(s):  
Co Oxidation ◽  
Room Temperature ◽  
Low Cost ◽  
Single Atom ◽  
Doped Graphene ◽  
Co Doped

Origin of room-temperature ferromagnetism in Co-doped CeO2

2021 ◽  
pp. 413158
Author(s):  
Kenji Tarui ◽  
Tomohiro Oomori ◽  
Yuya Ito ◽  
Tomoyuki Yamamoto
Keyword(s):  
Room Temperature ◽  
Room Temperature Ferromagnetism ◽  
Doped Ceo2 ◽  
Co Doped

Nitrogen doping-mediated room-temperature ferromagnetism in insulating Co-doped SnO2 films

2010 ◽  
Vol 256 (14) ◽  
pp. 4488-4492 ◽  
Author(s):  
X.F. Liu ◽  
Javed Iqbal ◽  
S.L. Yang ◽  
B. He ◽  
R.H. Yu
Keyword(s):  
Nitrogen Doping ◽  
Room Temperature ◽  
Room Temperature Ferromagnetism ◽  
Co Doped

Room-Temperature Ferromagnetism of Co-Doped CeO 2 Thin Films on Si(111) substrates

2007 ◽  
Vol 24 (1) ◽  
pp. 218-221 ◽  
Author(s):  
Song Yuan-Qiang ◽  
Zhang Huai-Wu ◽  
Wen Qi-Ye ◽  
Li Yuan-Xun ◽  
John Q Xiao
Keyword(s):  
Thin Films ◽  
Room Temperature ◽  
Room Temperature Ferromagnetism ◽  
Co Doped
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