Structural, magnetic and Mossbauer studies of TI doped Gd2Fe17−xTix and Gd2Fe16Ga1−xTix (0≤x≤1)

Pokharel, Ganesh; Ali, K.S. Syed; Mishra, Sanjay R.

doi:10.1016/j.jmmm.2014.12.079

“…Thus, the higher Tc values of Gd 2 Fe 16 Ga 0.5 TM 0.5 as compared to that of pure Gd 2 Fe 17 could be attributed to this effect as well. In comparison to various doped intermetallic such as Gd 2 Fe 16 Ga (~410 K) [46], Gd 2 Fe 16 Ga 0.5 Ti 0.5 (556 K) [47], Dy 2 Fe 16 Ga (~462 K) [8], Ce 2 Fe 16 Ga (~320 K) [48], Sm 2 Fe 16 Ga (~505 K) [49], or Sm 2 Fe 16.2 Ti 0.8 (~435 K) [50], the reported compound Gd 2 Fe 16 Ga 0.5 TM 0.5 with Co, Ni, and Cu substitution certainly exhibits higher Tc and Ms, thus ensuring their potential use as high-temperature permanent magnet applications.…”

Section: Resultsmentioning

confidence: 99%

Structural, Magnetic, and Mössbauer Studies of Transition Metal-Doped Gd2Fe16Ga0.5TM0.5 Intermetallic Compounds (TM = Cr, Mn, Co, Ni, Cu, and Zn)

Dahal

¹

,

Ali²,

Mishra

³

et al. 2018

View full text Add to dashboard Cite

The effect of transition metal substitution for Fe and the structural and magnetic properties of Gd 2 Fe 16 Ga 0.5 TM 0.5 (TM = Cr, Mn, Co, Ni, Cu, and Zn) compounds were investigated in this study. Rietveld analysis of X-ray data indicates that all the samples crystallize in the hexagonal Th 2 Ni 17 structure. The lattice parameters a, c, and the unit cell volume show TM ionic radii dependence. Both Ga and TM atoms show preferred site occupancy for 12j and 12k sites. The saturation magnetization at room temperature was observed for Co, Ni, and Cu of 69, 73, and 77 emu/g, respectively, while a minimum value was observed for Zn (62 emu/g) doping in Gd 2 Fe 16 Ga 0.5 TM 0.5 . The highest Curie temperature of 590 K was observed for Cu doping which is 15 and 5% higher than Gd 2 Fe 17 and Gd 2 Fe 16 Ga compounds, respectively. The hyperfine parameters viz. hyperfine field and isomer shift show systematic dependence on the TM atomic number. The observed magnetic and Curie temperature behavior in Gd 2 Fe 16 Ga 0.5 TM 0.5 is explained on the basis of Fe(3d)-TM(3d) hybridization. The superior Curie temperature and magnetization value of Co-, Ni-, and Cu-doped Gd 2 Fe 16 Ga 0.5 TM 0.5 compounds as compared to pure Gd 2 Fe 17 or Gd 2 Fe 16 Ga makes Gd 2 Fe 16 Ga 0.5 TM 0.5 a potential candidate for high-temperature industrial magnet applications.

show abstract

“…Thus, observed higher Tc values of Gd2Fe16Ga0.5TM0.5 as compared to that of pure Gd2Fe17 could be attributed to this effect as well. In comparison to various doped intermetallics such as Gd2Fe16Ga (~410 K) [45], Gd2Fe16Ga0.5Ti0.5 (556 K) [46], Dy2Fe16Ga (~462K) [8], Ce2Fe16Ga (~320K) [47], Sm2Fe16Ga (~505K) [48], or Sm2Fe16.2Ti0.8 (~435K) [49], the reported compound The hyperfine parameters derived from the fitting are listed in Table V, and weighted average (Wt.Avg.) hyperfine field (HF) and isomer shifts (IS, ) are plotted in Fig.…”

Section: Resultsmentioning

confidence: 99%

Structural, Magnetic and Mossbauer studies of Transition metal doped Gd2Fe16Ga0.5TM0.5 intermetallic compounds (TM=Cr, Mn, Co, Ni, Cu, and Zn)

Dahal¹,

Sikkanther²,

Alam³

et al. 2018

Preprint

View full text Add to dashboard Cite

The effect of transition metal substitution for Fe and the structural and magnetic properties of Gd2Fe16Ga0.5TM0.5 (TM=Cr, Mn, Co, Ni, Cu, and Zn) compounds were investigated. Rietveld analysis of X-ray diffraction indicates that all the samples crystallize in the hexagonal Th2Ni17 structure. The lattice parameters: a, c and unit cell volume show TM ionic radii dependence. Both Ga and TM atoms show preferred site occupancy for 12j and 12k sites. The saturation magnetization at maximum room temperature was observed for Co, Ni, and Cu of 69, 73, and 77 emu/g, respectively while minimum value was observed for Zn (62emu/g) doping Gd2Fe16Ga0.5TM0.5. Highest Curie temperature of 590 K was observed for Cu doping which is 15% and 5% and thesehigher than Gd2Fe17 and Gd2Fe16Ga compounds, respectively. The hyperfine parameters viz. hyperfine field and isomer shift, show systematic dependence on the TM atomic number. The observed magnetic and Curie temperature behavior in Gd2Fe16Ga0.5TM0.5 is explained on the basis of Fe(3d)-TM(3d) hybridization. The superior Curie temperature and magnetization value of Co, Ni, and Cu doped Gd2Fe16Ga0.5TM0.5 compounds as compared to pure Gd2Fe17 or Gd2Fe16Ga makes Gd2Fe16Ga0.5TM0.5 a potential candidate for high-temperature industrial magnet applications.

show abstract

“…Thus, observed higher Tc values of Gd2Fe16Ga0.5TM0.5 as compared to that of pure Gd2Fe17 could be attributed to this effect as well. In comparison to various doped intermetallics such as Gd2Fe16Ga (~410 K) [45], Gd2Fe16Ga0.5Ti0.5 (556 K) [46], Dy2Fe16Ga (~462K) [8], Ce2Fe16Ga (~320K) [47], Sm2Fe16Ga (~505K) [48], or Sm2Fe16.2Ti0.8 (~435K) [49], the reported compound Gd2Fe16Ga0.5TM0.5 with Co, Ni, and Cu substitution certainly exhibits higher Tc and Ms, thus ensuring their potential use as high temperature permanent magnet applications.…”

Section: Resultsmentioning

confidence: 99%

“…Thus, this inequivalency demands further magnetic splitting of g, j, and k iron sites. Mössbauer studies of Gd2Fe16Ga0.5TM0.5 have been conducted accordingly, either with 8 or 10 magnetic sextets, with absence or presence of impurity phase, respectively[46,53,54,55]. The Mössbauer spectral analysis was carried out with magnetic sextets assigned to the 4f, 6g, 12j, and 12k sites in Gd2Fe17.…”

mentioning

confidence: 99%

Structural, Magnetic and Mossbauer studies of Transition metal doped Gd2Fe16Ga0.5TM0.5 intermetallic compounds (TM=Cr, Mn, Co, Ni, Cu, and Zn)

Dahal¹,

Batcha²,

Alam³

2018

Preprint

0

View full text Add to dashboard Cite

The effect of transition metal substitution for Fe and the structural and magnetic properties of Gd2Fe16Ga0.5TM0.5 (TM=Cr, Mn, Co, Ni, Cu, and Zn) compounds were investigated. Rietveld analysis of X-ray diffraction indicates that all the samples crystallize in the hexagonal Th2Ni17 structure. The lattice parameters: a, c and unit cell volume show TM ionic radii dependence. Both Ga and TM atoms show preferred site occupancy for 12j and 12k sites. The saturation magnetization at maximum room temperature was observed for Co, Ni, and Cu of 69, 73, and 77 emu/g, respectively while minimum value was observed for Zn (62emu/g) doping Gd2Fe16Ga0.5TM0.5. Highest Curie temperature of 590 K was observed for Cu doping which is 15% and 5% and thesehigher than Gd2Fe17 and Gd2Fe16Ga compounds, respectively. The hyperfine parameters viz. hyperfine field and isomer shift, show systematic dependence on the TM atomic number. The observed magnetic and Curie temperature behavior in Gd2Fe16Ga0.5TM0.5 is explained on the basis of Fe(3d)-TM(3d) hybridization. The superior Curie temperature and magnetization value of Co, Ni, and Cu doped Gd2Fe16Ga0.5TM0.5 compounds as compared to pure Gd2Fe17 or Gd2Fe16Ga makes Gd2Fe16Ga0.5TM0.5 a potential candidate for high-temperature industrial magnet applications.

show abstract

Structural, magnetic and Mossbauer studies of TI doped Gd2Fe17−xTix and Gd2Fe16Ga1−xTix (0≤x≤1)

Cited by 9 publications

References 64 publications

Structural, Magnetic, and Mössbauer Studies of Transition Metal-Doped Gd2Fe16Ga0.5TM0.5 Intermetallic Compounds (TM = Cr, Mn, Co, Ni, Cu, and Zn)

Structural, Magnetic, and Mössbauer Studies of Transition Metal-Doped Gd2Fe16Ga0.5TM0.5 Intermetallic Compounds (TM = Cr, Mn, Co, Ni, Cu, and Zn)

Structural, Magnetic and Mossbauer studies of Transition metal doped Gd2Fe16Ga0.5TM0.5 intermetallic compounds (TM=Cr, Mn, Co, Ni, Cu, and Zn)

Structural, Magnetic and Mossbauer studies of Transition metal doped Gd2Fe16Ga0.5TM0.5 intermetallic compounds (TM=Cr, Mn, Co, Ni, Cu, and Zn)

Contact Info

Product

Resources

About