Phase and structural behaviour of the PrAlO3–LaAlO3 pseudo-binary system

Basyuk, Tetyana; Vasylechko, L.; Fadeev, S.; Syvorotka, I.I.; Trots, D.; Niewa, Rainer

doi:10.1016/j.radphyschem.2009.03.084

Cited by 12 publications

(33 citation statements)

References 17 publications

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“…Five kinds of solid solutions with different perovskite-type crystal structures exist in the system, depending on composition and temperature. Similar to the first members of the RAlO 3 series (R = La, Ce, Pr, Nd) and pseudo-binary solid solutions among them [5,[30][31][32], the mixed praseodymium- samarium aluminates Pr 1−x Sm x AlO 3 with x < 0.9 crystallize in the cubic perovskite structure at high temperatures, which on cooling transforms into a rhombohedral structure. The solid solution with the cubic structure exists in a relatively narrow temperature range between the liquidus (solidus) lines and P m3m ↔ R3c transition temperature, which increase linearly with Sm content.…”

Section: Resultsmentioning

confidence: 95%

“…The temperature of the orthorhombic-to-monoclinic phase transition decreases linearly with decreasing Pr content, whereas for the rhombohedral-to-orthorhombic transformation some increase of the transition temperature is observed. In this respect, the system studied differs from the related PrAlO 3 -RAlO 3 and CeAlO 3 -RAlO 3 (R = La, Nd) systems, in which the temperatures of all LT transitions drop with decreasing praseodymium (cerium) content [28][29][30][31][32].…”

Section: Resultsmentioning

confidence: 99%

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Phase and Structural Behaviour of the PrAlO₃-SmAlO₃System

et al. 2010

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High resolution in situ X-ray powder diffraction applying synchrotron radiation and differential thermal analysis/scanning calorimetry methods have been used to examine the pseudo-binary system PrAlO 3 -SmAlO 3 . Two kinds of solid solutions with rhombohedral and orthorhombic structure exist at room temperature. At elevated temperatures, a continuous phase transition P m3m ↔ R3c and a first-order transformation R3c ↔ P bmn occur in the two respective phases. A sequence of low-temperature phase transformations R3c ↔ Imma ↔ C2/m has been detected in Pr 1−x Sm x AlO 3 samples with x < 0.35. Based on in situ powder diffraction and differential thermal analysis/scanning calorimetry data, the phase diagram of the pseudo-binary system PrAlO 3 -SmAlO 3 has been constructed.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Phase and Structural Behaviour of the PrAlO₃-SmAlO₃System

et al. 2010

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“…Taking into account that the radius of Pr 3+ in the dodecahedral coordination is 1.33 Å [20], radius of Pr 4+ is unknown but should be smaller and the radiuses of octahedral Mn 4+ , Mn 3+ LS, Mn 3+ HS and Al 3+ are 0.53 Å, 0.58 Å, 0.65 Å, 0.675 Å, respectively, we can conclude that for the doped sample the non-significant decrease of the lattice parameter may be caused by both contributions: manganese and/or Pr 4+ . (1) Because the position of the XPS Al2p line (Fig. 4a) in the doped sample changes due to the chemical shift (Table 2), we can expect that the manganese ions occupy the aluminium positions.…”

Section: Resultsmentioning

confidence: 98%

“…As in many others, its crystal structure is unstable with temperature and several crystallographic transitions occur. Below the melting point at 2350 K [1] the compound crystallizes in a cubic structure, space group (S.G.) Pm-3m. Below 1864 K [1,2] or 1650 K [3], depending on literature, the structure is transformed into a rhombohedral one with S.G. R-3c.…”

Section: Introductionmentioning

confidence: 99%

“…Below the melting point at 2350 K [1] the compound crystallizes in a cubic structure, space group (S.G.) Pm-3m. Below 1864 K [1,2] or 1650 K [3], depending on literature, the structure is transformed into a rhombohedral one with S.G. R-3c. Lowering the temperature below 220 K leads to transformations of the structure into orthorhombic (S.G. Imma), and finally below 155 K, into monoclinic, S.G. C2/m [2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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Magnetic properties of manganese doped PrAlO3 monocrystalline fibres

Guzik

Talik

Pajączkowska

et al. 2014

Materials Science-Poland

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Monocrystalline fibres of undoped PrAlO 3 and PrAlO 3 :0.1 Mn, have been grown by the pulling-down method under nitrogen atmosphere. The as-grown crystal doped with Mn had a visible brown core surrounded by a green ring, whereas this effect was weaker for the undoped PrAlO 3 . A coloration of the brown core was caused by a presence of Pr 4+ ions. The presence of the Pr 4+ ions was confirmed by XPS and magnetic studies. The XPS chemical analysis showed the increased concentration of oxygen in the crystals with the brown core. The most probable valency of manganese is Mn 4+ . It is located in Al 3+ sites.

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Effects of Temperature and Pressure on the Magnetic Properties of La_1–xPr_xCoO₃

Панфилов

Lyogenkaya

Grechnev

et al. 2020

Physica Status Solidi (b)

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For La1–xPrxCoO3 cobaltites (x = 0, 0.1, 0.2, and 0.3), the dependence of magnetic susceptibility χ(T) is studied in the temperature range 5–400 K. Also, the crystal structure of these cobaltites is investigated, and the effect of pressure up to 2 kbar on their susceptibility is measured at T=78, 150, and 300 K. The specific dependencies χ(T) and the large negative pressure effect are assumed to arise from Co3+ ions contribution to the total susceptibility evaluated using La1−xPrxAlO3 as a reference system. The obtained experimental data on temperature and pressure effects in magnetism are analyzed within a two‐level model with energy gap Δ between the ground state of the system with zero spin of Co3+ ions and the excited higher‐spin state. In this model, magnetism of Co3+ ions is determined by the temperature‐induced population of the excited state, and magnitude of the pressure effect is governed by the volume dependence of Δ. The results of the analysis, supplemented by the theoretical calculations of the electronic structures of LaCoO3 and PrCoO3, indicate significant increase in Δ with decrease in the unit cell volume both under hydrostatic pressure and by substituting La with Pr having a smaller ionic radius.

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Phase and structural behaviour of the PrAlO3–LaAlO3 pseudo-binary system

Cited by 12 publications

References 17 publications

Phase and Structural Behaviour of the PrAlO₃-SmAlO₃System

Phase and Structural Behaviour of the PrAlO₃-SmAlO₃System

Magnetic properties of manganese doped PrAlO3 monocrystalline fibres

Effects of Temperature and Pressure on the Magnetic Properties of La_1–xPr_xCoO₃

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Phase and structural behaviour of the PrAlO3–LaAlO3 pseudo-binary system

Cited by 12 publications

References 17 publications

Phase and Structural Behaviour of the PrAlO3-SmAlO3System

Phase and Structural Behaviour of the PrAlO3-SmAlO3System

Magnetic properties of manganese doped PrAlO3 monocrystalline fibres

Effects of Temperature and Pressure on the Magnetic Properties of La1–xPrxCoO3

Contact Info

Product

Resources

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Phase and Structural Behaviour of the PrAlO₃-SmAlO₃System

Phase and Structural Behaviour of the PrAlO₃-SmAlO₃System

Effects of Temperature and Pressure on the Magnetic Properties of La_1–xPr_xCoO₃