Mixed valence of praseodymium oxides

Kimura, Shin-ichi; Arai, F.; Ikezawa, Mikihiko

doi:10.1016/s0368-2048(96)80045-4

Cited by 24 publications

(17 citation statements)

References 7 publications

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“…The choice of using Pr as the rare earth element in the perovskite oxide instead of La, studied in a previous paper [15], is due to its peculiarity to show +3 and +4 valence states [16], which might induce interesting electrical properties [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Nano-sized Pr0.8Sr0.2Co1-xFexO3 powders prepared by single-step combustion synthesis for solid oxide fuel cell cathodes

2009

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Different sets of perovskite-type oxides of general formula Pr 0.8 Sr 0.2 Co 1-x Fe x O 3-δ (x=0.0, 0.2, 0.5, 0.8 and 1.0) were successfully prepared by low-cost single-step combustion synthesis at low temperatures based on the auto-ignition reaction of a nitrate solution in the presence of citric acid. Thermogravimetric and differential thermal analysis was carried out on nitrate-citrate precursors to determine the perovskite-phase formation process. The results revealed that the nitrate-citrate precursor exhibited self-propagating combustion behavior. Pr 0.8 Sr 0.2 Co 1-x Fe x O 3-δ powders showed an orthorhombic single-phase, with their unit cell volume increasing as a function of the Fe content (x). Scanning electron microscopy observations showed that the prepared powders were nanocrystalline. The Pr 0.8 Sr 0.2 Co 1-x Fe x O 3-δ powders were characterized as fuel cell electrodes on Ce 0.8 Sm 0.2 O 2-δ pellets in symmetrical cells, and the electrochemical properties of the electrode/electrolyte interfaces were investigated using electrochemical impedance spectroscopy (EIS) as a function of the temperature, Fe content (x) and oxygen partial pressure.

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Section: Introductionmentioning

confidence: 99%

Nano-sized Pr0.8Sr0.2Co1-xFexO3 powders prepared by single-step combustion synthesis for solid oxide fuel cell cathodes

2009

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“…Below this temperature an internal distortion of the oxygen sublattice causes the unit cell of the crystallographic structure to be doubled along one crystal axis [8,9]. Apart from neutron diffraction measurements, spectroscopic studies such as core-level photoemission, optical reflectivity, and fluorescence spectroscopy have been carried out for PrO 2 by several experimental groups [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Bulk modulus of CeO2 and PrO2—An experimental and theoretical study

Gerward

Olsen

Petit

et al. 2005

Journal of Alloys and Compounds

237

110

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“…In order to verify it, praseodymium oxide received from Rare Earth Development Division, BARC, Mumbai was heated at 1473 K for 24h in oxygen and its XRD pattern matched with Pr6O11(s) (PCPDF No:42-1121), in which Pr exists in mixed valence states of +3 and +4 [21].…”

Section: Materials Preparation and Characterisationmentioning

confidence: 99%

“…2(b), which mimics the cubic structure of Pr6O11(s) as well as UO2(s). The stable oxide of Pr in air is Pr6O11(s) in which Pr exists in mixed oxidation state of +3 and +4[21]. This could be the hindrance in formation of stoichiometric Pr6UO12(s) in air, where Pr exists only in +3 oxidation state.…”

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confidence: 99%