Synthesis, structure, electric transport and magnetic properties of Sr2LaMnFeO7 and Sr2LaMn1.5Fe0.5O7

Sharma, Indu; Magotra, Suresh; Singh, Devinder; Batra, S.; Mudher, K.D. Singh

doi:10.1016/s0925-8388(99)00257-1

Cited by 15 publications

(7 citation statements)

References 17 publications

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“…The linearity of the plots shows that the electrical conduction in these phases occurs by the Mott VRH mechanism which is generally observed in such perovskite-related phases. [23][24][25] The temperature dependence of inverse molar magnetic susceptibility is shown in Fig. 5.…”

Section: Resultsmentioning

confidence: 99%

Study of Structural, Electrical, and Magnetic Properties of Layered Perovskite Oxides LnSr2TiFeO7 (Ln = Nd, Gd)

Singh

2011

Journal of Elec Materi

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We report here the synthesis and results of electrical resistivity and magnetic susceptibility measurements in the low temperature range of the rare-earthdoped bilayered system LnSr 2 TiFeO 7 (Ln = Nd, Gd). Both phases crystallize with a tetragonal unit cell in space group I4/mmm. The phases exhibit insulating behavior, and the electrical transport mechanism agrees with the Mott variable-range hopping model. The decrease in electrical resistivity with decreasing ionic size of the rare-earth ion could be attributed to enhancement of the three-dimensional (3D) character along the c-axis because of the proximity of the (Ti/Fe)O 2 and (Ln,Sr)O layers along the c-axis. The magnetic studies suggest that the phases are antiferromagnetic and the antiferromagnetic behavior could be due to the Fe 3+ -O-Fe 3+ exchange interaction.

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Section: Resultsmentioning

confidence: 99%

Study of Structural, Electrical, and Magnetic Properties of Layered Perovskite Oxides LnSr2TiFeO7 (Ln = Nd, Gd)

Singh

2011

Journal of Elec Materi

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“…The same results were also reported earlier in such type of manganites. 24,25 The Ferromagnetic Curie temperature (T c ), obtained from the molar magnetic susceptibility ( ) versus Temperature plot (Fig. 6), was found to be 140 K.…”

Section: 26mentioning

confidence: 99%

“…4) in the temperature range of investigation shows that the electronic conduction occurs by a 3D variable range hopping mechanism which is generally observed in such perovskite-related phases. 10,25,26 The temperature dependence of the inverse molar magnetic susceptibility for NdSr 2 MnCrO 7 is shown in Figure 5. The effective magnetic moment (μ eff ) has been calculated from the high temperature linear region of the versus T plot and leads to the value 6.67 B. M. The contribution of the manganese ion (μ Mn ) to the magnetic moment has been calculated from the effective moment (μ eff ) and the theoretical magnetic moments of Nd 3+ and Cr 3+ ions from the relation 27 where n 1 , n 2 and n 3 are the number of Nd, Mn and Cr ions respectively, is the theoretical magnetic moment of the Nd 3+ ion (3.62 B.M) and is that of Cr 3+ ion, assuming it to be in the high spin state ( ).…”

Section: 26mentioning

confidence: 99%

Synthesis and Characterization of Intergrowth Type Perovskite Oxide NdSr₂MnCrO₇

Singh¹

2011

Bulletin of the Korean Chemical Society

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A new Ruddlesden-Popper phase NdSr2MnCrO7 has been prepared by the standard ceramic method. The powder X-ray diffraction studies suggest that the phase crystallizes with tetragonal unit cell in the space group I4/mmm. The electrical transport properties show that the phase is an electrical insulator and the electrical conduction in the phase occurs by a 3D variable range hopping mechanism. The magnetic studies suggest that the ferromagnetic interactions are dominant.

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“…The substitution of other transition metal ions in the Mn ion site leads to interesting property changes in the RP manganites. Sharma et al showed that LaSr 2 MnFeO 7 is oxygen deficient and the Mn ion exists in the mixed valence state. The Cr doping in LaSr 2 Mn 2 O 7 results in the disappearance of insulator–metal transition, and both the AFM Neel temperature and charge-ordered temperature shift to lower values with the increase in Cr substitution .…”

Section: Introductionmentioning

confidence: 99%

New Rare Earth-Doped Bilayered Perovskite Oxide Photocatalysts Sr₂La_0.5R_0.5FeMnO₇ (R = La, Nd, Sm, Gd, Dy) for the Degradation of Highly Toxic Methylene Blue Dye in Wastewater under Visible Light: Structural, Optical, and Magnetic Properties

et al. 2023

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This paper presents the rare earth doping effect on the structural, optical, and magnetic properties of bilayered Ruddlesden–Popper oxides Sr 2 La 0.5 R 0.5 FeMnO 7 (R = La, Nd, Sm, Gd, Dy). Moreover, we are reporting for the first time a new rare earth-doped bilayered perovskite oxide series for the highly toxic methylene blue dye degradation in wastewater under visible light. Structural analysis of the PXRD data using the Rietveld refinements confirms the formation of the phases in tetragonal symmetry with the I 4/ mmm space group. The unit cell lattice parameters ( a & c ) and the cell volume ( V ) decrease monotonically from La- to Dy-doped samples owing to the decrease in the lanthanide ionic radii. The X-ray photoelectron spectroscopy analysis indicates the existence of the Mn ions in the mixed valence state. The DRS study shows that the energy band gap value decreases on moving from La to Gd substitution; however, it further increases for the Dy-doped sample. The magnetic measurements reveal that all the phases exhibit dominant anti-ferromagnetic interactions with Neel temperature ( T N ) observed at 150, 147, 138, 113, and 117 K for La-, Nd-, Sm-, Gd-, and Dy-substituted phases, respectively. However, the presence of an unsaturated hysteresis loop observed in the isothermal magnetic field ( H ) vs magnetization ( M ) plot also indicates the existence of weak ferromagnetic interactions. The investigation of the photocatalytic activity of the synthesized samples was done by carrying out photo-oxidative degradation of methylene blue (MB) dye pollutants. The results show that the photodegradation enhances by doping with heavier rare earth ions with the exception of the Dy-doped sample. The Gd-doped catalyst shows the maximum degradation efficiency of 99.03% in 50 min under visible light irradiation. The scavenging experiments confirmed that the · OH was the main/dominant oxidizing agent involved in the degradation of the MB dye.

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Synthesis, structure, electric transport and magnetic properties of Sr2LaMnFeO7 and Sr2LaMn1.5Fe0.5O7

Cited by 15 publications

References 17 publications

Study of Structural, Electrical, and Magnetic Properties of Layered Perovskite Oxides LnSr2TiFeO7 (Ln = Nd, Gd)

Study of Structural, Electrical, and Magnetic Properties of Layered Perovskite Oxides LnSr2TiFeO7 (Ln = Nd, Gd)

Synthesis and Characterization of Intergrowth Type Perovskite Oxide NdSr₂MnCrO₇

New Rare Earth-Doped Bilayered Perovskite Oxide Photocatalysts Sr₂La_0.5R_0.5FeMnO₇ (R = La, Nd, Sm, Gd, Dy) for the Degradation of Highly Toxic Methylene Blue Dye in Wastewater under Visible Light: Structural, Optical, and Magnetic Properties

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Synthesis, structure, electric transport and magnetic properties of Sr2LaMnFeO7 and Sr2LaMn1.5Fe0.5O7

Cited by 15 publications

References 17 publications

Study of Structural, Electrical, and Magnetic Properties of Layered Perovskite Oxides LnSr2TiFeO7 (Ln = Nd, Gd)

Study of Structural, Electrical, and Magnetic Properties of Layered Perovskite Oxides LnSr2TiFeO7 (Ln = Nd, Gd)

Synthesis and Characterization of Intergrowth Type Perovskite Oxide NdSr2MnCrO7

New Rare Earth-Doped Bilayered Perovskite Oxide Photocatalysts Sr2La0.5R0.5FeMnO7 (R = La, Nd, Sm, Gd, Dy) for the Degradation of Highly Toxic Methylene Blue Dye in Wastewater under Visible Light: Structural, Optical, and Magnetic Properties

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Synthesis and Characterization of Intergrowth Type Perovskite Oxide NdSr₂MnCrO₇

New Rare Earth-Doped Bilayered Perovskite Oxide Photocatalysts Sr₂La_0.5R_0.5FeMnO₇ (R = La, Nd, Sm, Gd, Dy) for the Degradation of Highly Toxic Methylene Blue Dye in Wastewater under Visible Light: Structural, Optical, and Magnetic Properties