Crystal structure, magnetic properties, x-ray-photoemission-spectroscopy, and specific-heat measurements on<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Pr</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">BaO</mml:mi></mml:mrow><mml:mrow><mml:mn>4</

Felner, I.; Yeshurun, Y.; Hilscher, G.; Holubar, T.; Schaudy, G.; Yaron, U.; Cohen, Ori; Wolfus, Y.; Yacoby, E.R.; Klein, Lior; Potter, F.H.; Rastomjee, C.S.; Egdell, R.G.

doi:10.1103/physrevb.46.9132

Cited by 36 publications

(15 citation statements)

References 17 publications

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“…4 we present ZFC and FC dc-magnetization curves of some selected samples of La x Mn y O (3x+yV)/2 phase (mainly Mn-deficient) to have a supplementary insight into the nature of their magnetism. A general conclusion, which flows out from these measurements, is that the anti-ferromagnetism observed below ∼91 K for the sample III.4 and below ∼140 K for the series II samples (with the second transition of the II.1 and II.2 samples at ∼43 K, inclusively) is likely to be canted, identical to that exhibited by BaPrO 3 [12]. This feature seems to be characteristic for the O-form of lanthanum manganite phase in general.…”

Section: Resultsmentioning

confidence: 73%

On magnetic properties of LaMnO3±δ phase within its domain

Horyń

Zaleski

Bukowska

et al. 2004

Journal of Alloys and Compounds

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Section: Resultsmentioning

confidence: 73%

On magnetic properties of LaMnO3±δ phase within its domain

Horyń

Zaleski

Bukowska

et al. 2004

Journal of Alloys and Compounds

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“…The XPS spectra, Fig. 3 20 In particular, a spin-orbitsplitting energy of ϳ20 eV between the Pr 3d 5/2 and the Pr 3d 3/2 lines is apparent, and the overall spectrum is comprised of three pairs of peaks. The changes in the electron state responsible for each of these pairs of peaks has been presented by Ogasawara et al 19 and discussed further by Felner et al 20 What is relevant for this work is the shift in the peaks towards lower binding energies upon hydration ͑most evident for the B-BЈ pair of peaks which shift by about 0.07 eV͒, as well as a reduction in the intensity of the A-AЈ pair of Thus, the change in the oxidation state of Pr is accompanied by the release of oxygen from water molecules.…”

Section: Resultsmentioning

confidence: 98%

“…2,3 In addition, BaPrO 3 is unusual in its ability to host Pr primarily ͑if not entirely͒ in the 4 + oxidation state, and has therefore been of interest for its magnetic properties. [4][5][6][7][8][9] Measurement of hydrogen ͑or water͒ uptake in proton conducting perovskites has typically been carried out by thermogravimetric methods, 1 although in a limited number of cases other techniques have been employed. In an early example, the water solubility in yttria-stabilized zirconia ͑YSZ͒ has been determined from a measurement of the equilibrium water vapor pressure above the material, 10 whereas measurement of the integrated OH stretching band as determined from IR spectroscopy has been somewhat more recently employed in the case of strontium titanate.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen content in doped and undoped BaPrO3 and BaCeO3 by cold neutron prompt-gamma activation analysis

Jones

et al. 2005

Journal of Applied Physics

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Proton uptake in undoped and Y-doped BaPrO 3 has been measured by cold neutron prompt-gamma activation analysis, and compared to the proton uptake in Gd-doped BaCeO 3 , as determined by the same technique. The conventional proton incorporation model of perovskites in which oxygen ion vacancies, generated by the introduction of the trivalent dopant onto the tetravalent perovskite site, are filled with hydroxyl groups upon exposure of the sample to H 2 O containing atmospheres, predicts that the proton concentration in such materials should be no greater than the dopant concentration. In contradiction to this model, the proton concentration in BaPr 1−x Y x O 3 after humidification is as much as three times greater than the dopant concentration, and even undoped samples contain a high concentration of protons. Moreover, x-ray photoemission spectra suggest that the Pr oxidation state is lowered upon hydration. In contrast, BaCe 0.9 Y 0.1 O 3 shows a typical hydrogen concentration, of close to 90% of the yttrium concentration. The results are interpreted in terms of the variable valence of Pr, which can become reduced from the 4 + to the 3 + oxidation state upon exposure to water, and effectively behaves as a self-dopant within the structure.

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“…The main reason is probably the multiphase nature of PrSrO samples. The crystal structure and magnetic properties of PrBaO were characterized by Jacobson et al (4), and Hinatsu (5). At present it seems to be well established that PrBaO crystallizes in orthorhombic Pbnm space group with a+b+(2a N , c+2a N , where a N +4 A s denotes perovskite unit cell parameter.…”

Section: Introductionmentioning

confidence: 98%