Sol-Gel-Prepared Nanoparticles of Mixed Praseodymium Cobaltites-Ferrites

Pekinchak, Olga; Vasylechko, L.; Lutsyuk, Iryna; Vakhula, Yaroslav; Prots, Yurii; Carrillo‐Cabrera, W.

doi:10.1186/s11671-016-1295-y

Cited by 19 publications

(12 citation statements)

References 21 publications

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“…4). Similar phenomena of the lattice parameters crossover were earlier observed in the mixed cobaltite-ferrites PrCo 1- x Fe x O 3 and NdCo 1- x Fe x O 3 [25, 26], as well as in the related rare earth aluminates and gallates R 1- x R ’ x AlO 3 and R 1- x R ’ x GaO 3 [27–30], in which the end members of the systems show different relations of the lattice parameters. In spite of the observed peculiarities lattice parameters behaviour, the unit cell volume in La 1− x Sm x FeO 3 series decreases almost linearly with decreasing R -cation radii according to the Vegard’s rule.…”

Section: Resultssupporting

confidence: 82%

Structure Peculiarities of Micro- and Nanocrystalline Perovskite Ferrites La1−x Sm x FeO3

et al. 2017

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Micro- and nanocrystalline lanthanum-samarium ferrites La1−xSmxFeO3 with orthorhombic perovskite structure were obtained by using both solid state reactions (x = 0.2, 0.4, 0.6 and 0.8) and sol-gel synthesis (x = 0.5) techniques. Obtained structural parameters of both series of La1−xSmxFeO3 are in excellent agreement with the “pure” LaFeO3 and SmFeO3 compounds, thus proving formation of continuous solid solution in the LaFeO3–SmFeO3 system. Peculiarity of La1−xSmxFeO3 solid solution is divergence behaviour of unit cell dimensions with increasing x: systematic decrease of the a and c lattice parameters is accompanied with increasing b parameter. Such behaviour of the unit cell dimensions in La1−xSmxFeO3 series led to crossover of the a and c perovskite lattice parameters and formation of dimensionally tetragonal structure near x = 0.04. Linear decrease of the unit cell volume of La1−xSmxFeO3 with decreasing x according with the Vegard’s rule indicate absence of short-range ordering of R-cations in the LaFeO3–SmFeO3 system.

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Section: Resultssupporting

confidence: 82%

Structure Peculiarities of Micro- and Nanocrystalline Perovskite Ferrites La1−x Sm x FeO3

et al. 2017

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“…As a result, a crossover of a p -and c pparameters occurs in Dy 1−x R x FeO 3 system. Similar phenomena were earlier observed in the related cobaltiteferrites RCo 1−x Fe x O 3 [21,22], as well as among isostructural rare earth perovskites R 1−x R x Al(Ga)O 3 [23,24], in which end members of the systems possess different relations of the unit cell dimensions. Figure 4 demonstrates evolution of the lattice parameters and unit cell volumes in Dy 0.5 R 0.5 FeO 3 series versus ionic radii of rare earth cations.…”

Section: Methodssupporting

confidence: 85%

Synthesis and Structure Characterisation of Micro-and Nanocrystalline Powders of Dy_1-xR_xFeO₃ (R = La, Pr, Nd, Sm, Gd)

et al. 2018

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This work deals with the study of the phase and crystal structure behaviour of new micro-and nanocrystalline ferrites Dy1−xRxFeO3 obtained by solid state reactions (R = La, Pr) and sol-gel citrate (R = Nd, Sm, Gd) techniques. It was established that all synthesized samples adopt orthorhombic perovskite structure isotypic with GdFeO3. Unit cell dimensions and atomic coordinates of the mixed rare earth ferrites derived by full profile Rietveld refinement technique agree well with the data of the "pure" DyFeO3 and RFeO3 compounds, thus proving formation of continuous solid solutions Dy1−xRxFeO3 in the DyFeO3-RFeO3 systems (R = La, Pr, Nd, Sm, Gd). Peculiarity of the Dy1−xLaxFeO3 series is the lattice parameters crossover and formation of dimensionally tetragonal structure at x ≈ 0.97.

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“…Peculiarity of the PrCoO 3 -PrFeO 3 system is a lattice parameter crossover [7], which results in four regions of PrCo 1−x Fe x O 3 solid solution with different relations of the cell dimensions ( Fig. 1, top part).…”

Section: Resultsmentioning

confidence: 99%

Thermal Behaviour of PrCo_1-xFe_xO₃ Probed by X-ray Synchrotron Powder Diffraction and Impedance Spectroscopy Measurements

et al. 2018

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Crystal structure and transport properties of the mixed praseodymium cobaltites-ferrites PrCo1−xFexO3 have been studied in the temperature range of 298-1173 K by a combination of in situ X-ray synchrotron powder diffraction and temperature dependent impedance spectroscopy measurements. In situ high temperature powder diffraction examination of PrCo1−xFexO3 series revealed considerable anomalies in the lattice expansion which are especially pronounced for the cobalt-rich specimens. These anomalies, which are reflected in a sigmoidal dependence of the unit cell dimensions and in the considerable increase of the thermal expansion coefficients, are obviously associated with transitions of Co 3+ ions from low spin to the higher spin states and the coupled metal-insulator transitions, occurring in in rare earth cobaltites at the elevated temperatures. Indeed, the temperature-dependent impedance measurements clearly prove the change of conductivity type from dielectric to the metallic behaviour in the mixed cobaltite-ferrites PrCo1−xFexO3 at the elevated temperatures.

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Sol-Gel-Prepared Nanoparticles of Mixed Praseodymium Cobaltites-Ferrites

Cited by 19 publications

References 21 publications

Structure Peculiarities of Micro- and Nanocrystalline Perovskite Ferrites La1−x Sm x FeO3

Structure Peculiarities of Micro- and Nanocrystalline Perovskite Ferrites La1−x Sm x FeO3

Synthesis and Structure Characterisation of Micro-and Nanocrystalline Powders of Dy_1-xR_xFeO₃ (R = La, Pr, Nd, Sm, Gd)

Thermal Behaviour of PrCo_1-xFe_xO₃ Probed by X-ray Synchrotron Powder Diffraction and Impedance Spectroscopy Measurements

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Sol-Gel-Prepared Nanoparticles of Mixed Praseodymium Cobaltites-Ferrites

Cited by 19 publications

References 21 publications

Structure Peculiarities of Micro- and Nanocrystalline Perovskite Ferrites La1−x Sm x FeO3

Structure Peculiarities of Micro- and Nanocrystalline Perovskite Ferrites La1−x Sm x FeO3

Synthesis and Structure Characterisation of Micro-and Nanocrystalline Powders of Dy1-xRxFeO3 (R = La, Pr, Nd, Sm, Gd)

Thermal Behaviour of PrCo1-xFexO3 Probed by X-ray Synchrotron Powder Diffraction and Impedance Spectroscopy Measurements

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Product

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Synthesis and Structure Characterisation of Micro-and Nanocrystalline Powders of Dy_1-xR_xFeO₃ (R = La, Pr, Nd, Sm, Gd)

Thermal Behaviour of PrCo_1-xFe_xO₃ Probed by X-ray Synchrotron Powder Diffraction and Impedance Spectroscopy Measurements