Effects of sintering temperature and atmosphere on magnetism in Mn-doped TiO2 bulk samples

Tian, Zhaoming; Yuan, Songliu; He, Jianhua; Wang, Y.Q.; Li, P.; Xie, Haiyan; Liu, L.; Yin, S.Y.

doi:10.1016/j.ssc.2007.03.008

Cited by 18 publications

(11 citation statements)

References 23 publications

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“…The effect of such ferromagnetic clusters must be examined more carefully before the usefulness of such materials for spintronics applications can be determined [15]. In this context, recent reports [16][17][18][19] about the observation of RTFM in manganese doped TiO 2 has been taken with great enthusiasm by the scientific community. This is mostly because of the fact that the metallic manganese, as well as all possible Mn-O based secondary phases (except Mn 3 O 4 with T C ∼ 43 K), are nonferromagnetic.…”

Section: Introductionmentioning

confidence: 99%

Ferromagnetism of Mn-doped TiO2 nanorods synthesized by hydrothermal method

Patel

Gajbhiye

Date

2011

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Ferromagnetism of Mn-doped TiO2 nanorods synthesized by hydrothermal method

Patel

Gajbhiye

Date

2011

Journal of Alloys and Compounds

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“…Also it is attributed to obvious 20 µ µm increasing in the grain size and sever sintering effect with particles coalescence that leads to the formation of a dense matrix. [21][22][23][24] As shown above in Fig. 6, this development in the microstructure of the synthesized Fe-W composite under the effect of reaction temperature could reflect the reason for the promotion in its magnetic behavior.…”

Section: Magnetic Propertiesmentioning

confidence: 70%

Hydrogen Reduction of Fe2O3/WO3 Mixture with Synthesis of Nanocrystalline Fe/W Composite

2008

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Nanocrystalline Fe-W composite is synthesized through the reduction of iron oxide/tungsten oxide (Fe 2 O 3 /WO 3 ) mixture with pure hydrogen gas at 700-1000 C. AR grade Fe 2 O 3 and WO 3 powders were mixed thoroughly in ball mill and compacted. The dried compacts were isothermally reduced in pure hydrogen at 700, 800, 900 and 1000 C. Based on thermogravimetric analysis, the reduction behavior and kinetics reaction mechanism were studied. The initial oxides mixture and the various reduction products were characterized by XRD, SEM, VSM and reflected light microscope to reveal the effect of hydrogen reduction on microstructure, magnetic properties and reaction kinetics of produced Fe-W composite. Complete reduction was achieved with the synthesis of nanocrystalline (36.3 nm) homogenous Fe-W composite. Arrhenius equation with the approved mathematical formulations for the gas solid reaction was applied for the calculation of the activation energy values and detecting the controlling reaction mechanism.

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“…Tungsten has very low Para-magnetism with magnetic susceptibility of about 6.8. Also it is attributed to the obvious increase in the grain size and sintering effect with particles coalescence that leads to the formation of a dense matrix [18][19][20][21]. As shown above in Fig.…”

Section: Hardness and Magnetic Measurementsmentioning

confidence: 78%