Synthesis of lanthanum oxyhydroxide single crystals using an electrochemical method

Samata, H.; Kimura, Daisuke; Saeki, Yuta; Nagata, Y.; Ozawa, Tadashi C.

doi:10.1016/j.jcrysgro.2007.03.025

Cited by 24 publications

(18 citation statements)

References 19 publications

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“…In a mixed oxygen chemisorptionpenetration situation, bond lengths and crystal potentials may vary significantly leading to a range of O 1s binding energies; this may also account for the large width and variable BE positions of the lateral structure. Moreover, (OH) − in LNO may be in two forms: hydroand oxyhydroxides [16] with a close, but different O 1s core level BE in lateral peak energies range. The high energy tail may include physisorbed (∼534 eV), chemisorbed (∼532 eV), structural H 2 O and water in poor electrical contact with the films surface [17,18].…”

Section: Resultsmentioning

confidence: 99%

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Surface stability of epitaxial LaNiO_3-δthin films

Mickevičius¹,

Grebinskij²,

Bondarenka³

et al. 2010

Lithuanian J. Phys.

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Thin LaNiO 3−δ films with pseudocubic (100) preferred orientation were prepared by reactive DC magnetron sputtering and in situ annealed in O2 and vacuum. X-ray photoelectron spectroscopy (XPS) was used to determine the variation in composition of the films under high temperature annealing. The experimental O 1s and La 3d -Ni 2p 3/2 spectra of LaNiO 3−δ films was analysed in terms of O 2− , O − /(OH) − , and weakly adsorbed oxygen species. It was shown that the change in the type of conductivity from metallic to semiconducting one is accompanied by a marked increase in the intensity of the lateral (∼531 eV) peak of oxygen. The quantitative analyses of La 3d -Ni 2p 3/2 spectra show that the Ni/La concentration ratio significantly decreases after heating above the dehydration temperature. These variations in conductivity and surface composition were attributed to the loss of lattice oxygen with subsequent adsorption of O − and (OH) − anions and weakly adsorbed oxygen species from ambient air.

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Section: Resultsmentioning

confidence: 99%

“…Further annealing leads to an additional decrease in the lateral peak (∼531 eV) intensity and may be related to the film dehydration. It is known that thermal transformation from lanthanum hydroxide to oxide is a twostep mechanism [16,20]. The intermediate product is lanthanum hydroxide oxide: La(OH) 3 → LaOOH + H 2 O (310-340 • C).…”

Section: Resultsmentioning

confidence: 99%

Surface stability of epitaxial LaNiO_3-δthin films

Mickevičius¹,

Grebinskij²,

Bondarenka³

et al. 2010

Lithuanian J. Phys.

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“…When Gd 3+ (ionic radius: 0.0935 nm) in GdOOH was replaced by Eu 3+ (ionic radius: 0.0947 nm), the lattice constants showed a slight increase, in accordance with Vegard' law. Gd 1−x Eu x OOH had low rare-earth site symmetry and a layered structure in which the rare earth layers were sandwiched between an O layer and an OH layer [11] [12].…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Fluorescence Quantum Yield of Gd<sub>1－x</sub>Eu<sub>x</sub>OOH Crystals

Samata¹,

Itakura²,

Imanaka³

et al. 2014

MSCE

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Eu 3+ -doped gadolinium oxyhydroxide Gd 1−x Eu x OOH crystals were synthesized by the flux method. The X-ray diffraction data for the crystals were well refined assuming a monoclinic structure with the P2 1 /m space group. Gd 1−x Eu x OOH (x ≤ 0.2) crystals showed strong red emission, and the highest fluorescence quantum yield (Φ f ) was 0.27, obtained for x = 0.10. Φ f decreased rapidly as the Eu 3+ content x increased above 0.2, owing to concentration quenching. Analysis with a percolation model indicated three-dimensional energy transfer between the Eu 3+ ions.

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“…The initially hydrated LaNiO 3−δ surface may be restored by heating above dehydration temperature [6,7]. Nickel hydroxide, in turn, decomposes at T > 230 • C (melting point) [8].…”

Section: Introductionmentioning

confidence: 99%

Resonant photoemission of LaNiO_3-δthin films

Mickevičius¹,

Grebinskij²,

Bondarenka³

et al. 2010

Lithuanian J. Phys.

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Thin LaNiO 3−δ films with pseudocubic (100) preferred orientation were prepared by reactive DC magnetron sputtering and annealed at ultra high vacuum above dehydration temperature. The resonant photoemission spectroscopy was used to study the surface composition and electronic structure under La 4d→4f and Ni 3p→3d photoexcitation. The resonance features observed in core level and valence band spectra under La 4d→4f transition were explained in terms of autoionization process and lanthanum-oxygen valence band states' hybridization. No resonant features were observed in the valence band spectra under Ni 3p→3d excitation indicating that nickel species are not present at the LaNiO 3−δ film surface after heat treatment.

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Synthesis of lanthanum oxyhydroxide single crystals using an electrochemical method

Cited by 24 publications

References 19 publications

Surface stability of epitaxial LaNiO_3-δthin films

Surface stability of epitaxial LaNiO_3-δthin films

Synthesis and Fluorescence Quantum Yield of Gd<sub>1－x</sub>Eu<sub>x</sub>OOH Crystals

Resonant photoemission of LaNiO_3-δthin films

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Synthesis of lanthanum oxyhydroxide single crystals using an electrochemical method

Cited by 24 publications

References 19 publications

Surface stability of epitaxial LaNiO3-δthin films

Surface stability of epitaxial LaNiO3-δthin films

Synthesis and Fluorescence Quantum Yield of Gd&lt;sub&gt;1－x&lt;/sub&gt;Eu&lt;sub&gt;x&lt;/sub&gt;OOH Crystals

Resonant photoemission of LaNiO3-δthin films

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Surface stability of epitaxial LaNiO_3-δthin films

Surface stability of epitaxial LaNiO_3-δthin films

Synthesis and Fluorescence Quantum Yield of Gd<sub>1－x</sub>Eu<sub>x</sub>OOH Crystals

Resonant photoemission of LaNiO_3-δthin films