Synthesis by molten salt method of the AFeO3 system (A=La, Gd) and its structural, vibrational and internal hyperfine magnetic field characterization

Romero, M.; Gómez, R.; Marquina, V.; Pérez-Mazariego, J.L.; Escamilla, R.

doi:10.1016/j.physb.2014.03.024

Cited by 71 publications

(44 citation statements)

References 29 publications

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“…A good agreement of the Mössbauer parameters for undoped GdFeO 3 was found between the current results and those reported by Eibschütz et al [20] and Romero et al [33]. Only one magnetic sextet with sharp lines was observed.…”

Section: Mössbauer Spectroscopysupporting

confidence: 92%

The influence of chromium substitution on crystal structure and shift of Néel transition in GdFe1−xCrxO3 mixed oxides

Orliński

Diduszko

Kopcewicz

et al. 2016

J Therm Anal Calorim

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The gadolinium ferrochromite (GdFe 1-x Cr x O 3 ) was used as a case study of influence of chromium substitution on the perovskite structure in the entire composition range. By exploiting thermal analysis techniques (dilatometry, differential thermal analysis) the influence of chromium was investigated in the context of thermal stability of the canted antiferromagnetic ordering. It was found that the higher the chromium concentration was, the more the Néel temperature decreased, e.g., substitution of 26 % of iron atoms corresponded to a depression of about 60 K with respect to undoped gadolinium ferrite. For higher chromium concentrations the mixed gadolinium ferrochromite was paramagnetic at room temperature. Additional information on the crystal structure and, qualitatively, on the magnetic ordering as well was derived from the results of X-ray diffraction and Mössbauer spectroscopy measurements. For chromium content higher than 10 % the gadolinium ferrochromite may be regarded as a solid solution. For lower concentrations, however, a possible formation of clusters with different Fe/Cr ratio occurs as suggested by Mössbauer spectra.

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Section: Mössbauer Spectroscopysupporting

confidence: 92%

The influence of chromium substitution on crystal structure and shift of Néel transition in GdFe1−xCrxO3 mixed oxides

Orliński

Diduszko

Kopcewicz

et al. 2016

J Therm Anal Calorim

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“…According to the presented results, the heat-treated product contains magnetic (sextet) component. The hyperfine field of the total sextet component corresponds with those of orthorhombic gadolinium orthoferrite [23]. The magnetically ordered phase of o-GdFeO 3 has a trimodal distribution, as follows from the results presented as an insert in Fig.…”

Section: Fig 5 the Results Of Mössbauer Spectroscopy Of The Heat-trmentioning

confidence: 64%

Synthesis of GdFeO3 nanoparticles via low-temperature reverse co-precipitation: the effect of strong agglomeration on the magnetic behavior

Albadi¹,

Martinson²,

Shvidchenko³

et al. 2020

Nanosystems: Phys. Chem. Math.

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Gadolinium orthoferrite (GdFeO 3) seems to have potential as a dual-modal contrast agent for magnetic resonance imaging (MRI), thus its preparation in the form of ultrafine superparamagnetic nanoparticles is currently of great interest. In this work, nanocrystalline GdFeO 3 was successfully synthesized by the heat treatment (750 • C, 4 h) of gadolinium and iron(III) hydroxides reversely co-precipitated at low temperature (0 • C). Initial and resulting powders were analyzed by EDX, SEM, PXRD, Mössbauer spectroscopy, vibration magnetometry, etc. Gadolinium orthoferrite was formed as isometric nanocrystals with an average size of 23±3 nm, which were strongly agglomerated into clusters of about 200 nm in diameter. It was shown that the individual GdFeO 3 nanocrystals are superparamagnetic, but in the cluster form, they exhibit a collective weak ferromagnetic behavior. After ultrasonic-assisted disintegration of GdFeO 3 to a colloidal solution form, these clusters remained stable due to their strong agglomeration and low zeta potential value of 1 mV. Thus, it is concluded that the further use of the synthesized GdFeO 3 nanoparticles as a basis of MRI contrast agents will be possible only after the suppression of their clustering.

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“…ABO 3 perovskite-type oxides, with A = rare earth and B = transition metal ion [1], have been extensively studied for various advanced technological applications, such as catalysts [2,3], fuel cells [4], Li-O 2 batteries [5], magnetic materials [6], electrode [7], and gas sensors [8][9][10][11]. This is because that the ABO 3 perovskite structure is usually with structural defects due to fluctuations between the two stable oxidation states of iron; which causes the electrical balance by insertion in the lattice of O 2 − from environmental O 2 or the occurrence of oxygen vacancies [12], ABO 3 perovskite-type oxides always show superior properties in many applications.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of three-dimensionally ordered macroporous LaFeO3 with enhanced methanol gas sensing properties

Qin

Cui

Yang

et al. 2015

Sensors and Actuators B: Chemical

113

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Synthesis by molten salt method of the AFeO3 system (A=La, Gd) and its structural, vibrational and internal hyperfine magnetic field characterization

Cited by 71 publications

References 29 publications

The influence of chromium substitution on crystal structure and shift of Néel transition in GdFe1−xCrxO3 mixed oxides

The influence of chromium substitution on crystal structure and shift of Néel transition in GdFe1−xCrxO3 mixed oxides

Synthesis of GdFeO3 nanoparticles via low-temperature reverse co-precipitation: the effect of strong agglomeration on the magnetic behavior

Synthesis of three-dimensionally ordered macroporous LaFeO3 with enhanced methanol gas sensing properties

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