Surface Studies of Re3Fe5O12Garnets, ReFeO3Orthoferrites and ReVO4Orthovanadates

Sobczak, E.; Żymierska, D.; Ebel, H.

doi:10.12693/aphyspola.89.329

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…A similar case of two different O(1s) peaks in garnets was already observed by Sobczak et al 25 in iron garnets (Re 3 Fe 5 O 12 ) and in rare earth orthoferrites (ReFeO 3 ). They have observed the splitting of O(1s) line by about 1.6 eV for these compounds and also broadening of the Fe(2p 3 ) lines (ca.…”

Section: Resultssupporting

confidence: 80%

ESCA Studies of Yttrium Aluminum Garnets

et al. 1999

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X-ray photoelectron spectroscopy (XPS/ESCA) has been employed to investigate pure single crystals and powdered samples of yttrium aluminum garnet, Y 3 Al 5 O 12 (YAG), and YAG crystals doped with several rare earth elements (Ln ) Pr, Er, Ho, Tm) and a transition metal (Cr). Core level XPS peak shapes of the main elements forming the garnet structure can be rationalized due to different structural environments of particular ions modified by doping. The change of dopant oxidation state also results in variation of XPS peaks and helps to identify the sites in which it takes place. Single-crystal and powder samples give different XPS spectra. Possible sources of these differences are discussed. Similarities and differences between simple and mixed oxides are shown. The structure of YAG suggests the presence of only one independent oxygen ion; however the O(1s) spectra of all YAG systems exhibit two readily discerned peaks. An explanation for this dichotomy is discussed, involving the possible polarization of the oxygen valence electron density between the aluminum and yttrium. Alternative explanations are also considered.

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Section: Resultssupporting

confidence: 80%

ESCA Studies of Yttrium Aluminum Garnets

et al. 1999

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“…It has been noticed that the O(1s) oxygen signal in mixed oxides has a complicated, nonsingular shape. The splitting of the O(1s) oxygen peak was reported for compounds with the garnet structure Y 3 Al 5 O 12 10 and RE 3 Fe 5 O 12 , 11 where RE ) Eu or Dy, and compounds with the perovskite structure YAlO 3 12 and REFeO 3 , 11 where RE ) Dy, Ho, or Er. In ref 10, we discuss our model, which allows for the interpreting the O(1s) signals in mixed oxides.…”

Section: Introductionmentioning

confidence: 93%

Interpretation of XPS O (1s) in Mixed Oxides Proved on Mixed Perovskite Crystals

et al. 2001

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Mixed perovskites (AA′)(BB′)O 3 , where A ) La or Nd, A′ ) Sr, B ) Al or Ga, and B′ ) Ta or Nb, were investigated by X-ray photoelectron spectroscopy (XPS). The interpretation of XPS O(1s) signals in mixed oxides is discussed. The nonsingular O(1s) peak that occurs in the mixed oxides is due to the polarization of the oxygen valence electron density, as was already proposed by us for Y 3 Al 5 O 12 and YAlO 3 . This interpretation seems to be true also for the case when four different metals are in the oxide. The O(1s) binding energies seem to depend on the direction in which they are ejected.

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Raman-XPS spectroscopic investigation of heavy mineral sands along Indian coast

et al. 2021

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The beach sands of the Indian coast are bestowed with strategic minerals like ilmenite, monazite, rutile, sillimanite, garnet, and zircon. In order to bring out the importance of these heavy minerals, we present detailed studies on structure, surface chemistry, and absorption spectroscopy using advanced characterization techniques such as Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and UV-Visible-NIR spectroscopy. The study reveals the degree of metamictization in zircon and monazite and differentiates the isomorphous series in garnet, discrimination of opaque and non-opaque minerals, polymorphs, and the anisotropic changes in crystal symmetry due to their physical and chemical process. X-ray photoelectron spectroscopy illustrates the chemical composition, precise oxidation state, and chemical bonding of surface elements. UV-Visible-NIR spectroscopy reveals the electronic transition of elements and charge transfer spectra. This expansive dataset provides valuable information to the scientific community and mining industries to assist with determining the grade and potential uses of beach sands.

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Surface Studies of Re₃Fe₅O₁₂Garnets, ReFeO₃Orthoferrites and ReVO₄Orthovanadates

Cited by 3 publications

References 7 publications

ESCA Studies of Yttrium Aluminum Garnets

ESCA Studies of Yttrium Aluminum Garnets

Interpretation of XPS O (1s) in Mixed Oxides Proved on Mixed Perovskite Crystals

Raman-XPS spectroscopic investigation of heavy mineral sands along Indian coast

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