Physicochemical and Electrical Properties of Praseodymium Oxides

Ferro, Sergio

doi:10.4061/2011/561204

Cited by 33 publications

(7 citation statements)

References 28 publications

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“…This indicated that the reduction of praseodymium, Pr(III) in the used electrolyte takes place in only one electrochemical step involving three electron exchange, namely Pr(III) → Pr(0). The number of electrons involved in the Pr electroreduction process calculated in the present study corresponds very well with the average oxidation state of Pr in Pr6O11, which is in alignment to the available data 3.667 [32].…”

Section: Resultssupporting

confidence: 90%

Electrochemical Study of Nd and Pr Co-Deposition onto Mo and W from Molten Oxyfluorides

Cvetković

Feldhaus

Vukićević

et al. 2021

Metals

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Electrodeposition processes of neodymium and praseodymium in molten NdF3 + PrF3 + LiF + 1 wt.%Pr6O11 + 1 wt.%Nd2O3 and NdF3 + PrF3 + LiF + 2 wt.%Pr6O11 + 2 wt.%Nd2O3 electrolytes at 1323 K were investigated. Cyclic voltammetry, square wave voltammetry, and open circuit potentiometry were applied to study the electrochemical reduction of Nd(III) and Pr(III) ions on Mo and W cathodes. It was established that a critical condition for Nd and Pr co-deposition in oxyfluoride electrolytes was a constant praseodymium deposition overpotential of ≈−0.100 V, which was shown to result in co-deposition current densities approaching 6 mAcm−2. Analysis of the results obtained by applied electrochemical techniques showed that praseodymium deposition proceeds as a one-step process involving exchange of three electrons (Pr(III)→Pr(0)) and that neodymium deposition is a two-step process: the first involves one electron exchange (Nd(III)→Nd(II)), and the second involves an exchange of two electrons (Nd(II)→Nd(0)). X-ray diffraction analyses confirmed the formation of metallic Nd and Pr on the working substrate. Keeping the anodic potential to the glassy carbon working anode low results in very low levels of carbon oxides, fluorine and fluorocarbon gas emissions, which should qualify the studied system as an environmentally friendly option for rare earth metal deposition. The newly reported data for Nd and Pr metals co-deposition provide valuable information for the recycling of neodymium-iron-boron magnets.

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Section: Resultssupporting

confidence: 90%

Electrochemical Study of Nd and Pr Co-Deposition onto Mo and W from Molten Oxyfluorides

Cvetković

Feldhaus

Vukićević

et al. 2021

Metals

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“…After removal from the rubber tube, the rods were sintered at 1550 °C for 10 hr in air. These sintered rods were light brownish due to the presence of some Pr 4+ that results from heating in an oxygen containing ) has been reported for the praseodymium-oxygen system upon increasing the temperature and decreasing the oxygen content [34].…”

Section: Introductionmentioning

confidence: 68%

Synthesis, floating zone crystal growth and characterization of the quantum spin ice Pr2Zr2O7 pyrochlore

Koohpayeh

Wen

Trump

et al. 2014

Journal of Crystal Growth

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Pyrochlore Pr 3+ 2+x Zr 4+ 2-x O 7-x/2 samples in the form of both powders (-0.02≤x≤0.02) and bulk single crystals have been studied to elucidate the dependence of their magnetic, compositional and structural properties on synthesis and growth conditions. All samples were characterized using X-ray diffraction, specific heat, and DC magnetization measurements. The crystals were also studied using the X-ray Laue technique and scanning electron microscopy. Increasing the Pr content for the Pr 2+x Zr 2-x O 7-x/2 powders enlarged the lattice parameter, and resulted in systematic changes in magnetic susceptibility and specific heat.Stoichiometric and high quality single crystals of Pr 2 Zr 2 O 7 were grown using the optical floating zone technique under a high purity static argon atmosphere, to avoid inclusions of Pr 4+ and limit Pr vaporization. Increasing the growth speed was found to significantly reduce Pr vaporization for better control of stoichiometry. Scanning electron microscopy provided direct evidence of spinodal decomposition during growth that is controllable via rotation rate. An intermediate rotation rate of 3-6 rpm was found to produce the best microstructure. The magnetic susceptibility of crystals grown at rates from

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“…The change in colour of praseodymium zirconate from brown (Pr2Zr2O7) to green (Pr2Zr2O7-) after reduction in Ar + 3%H2 atmosphere is due to a reduction of the Pr 4+ cations to Pr 3+ [20,47]. As electron energy loss near-edge structure (ELNES) spectra can be used to obtain information on the Pr valance state in praseodymium oxides [48,49], we examine the oxidation state of Pr in our praseodymium zirconate samples using Pr-M5,4 ELNES spectra.…”

Section: Electron Energy Loss Spectroscopymentioning

confidence: 99%

Characterizing oxygen atoms in perovskite and pyrochlore oxides using ADF-STEM at a resolution of a few tens of picometers

et al. 2021

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Physicochemical and Electrical Properties of Praseodymium Oxides

Cited by 33 publications

References 28 publications

Electrochemical Study of Nd and Pr Co-Deposition onto Mo and W from Molten Oxyfluorides

Electrochemical Study of Nd and Pr Co-Deposition onto Mo and W from Molten Oxyfluorides

Synthesis, floating zone crystal growth and characterization of the quantum spin ice Pr2Zr2O7 pyrochlore

Characterizing oxygen atoms in perovskite and pyrochlore oxides using ADF-STEM at a resolution of a few tens of picometers

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