Inelastic exchange scattering in electron-energy-loss spectroscopy: Localized excitations in transition-metal and rare-earth systems

1994 ◽  
Vol 50 (4) ◽  
pp. 2638-2641 ◽  
Author(s):  
S. J. Porter ◽  
J. A. D. Matthew ◽  
R. J. Leggott
Keyword(s):  
Rare Earth ◽  
Transition Metal ◽  
Energy Loss ◽  
Electron Energy ◽  
Electron Energy Loss Spectroscopy ◽  
Earth Systems ◽  
Localized Excitations ◽  
Rare Earth Systems ◽  
Exchange Scattering ◽  
Electron Energy Loss

HYBRIDIZATION BETWEEN 4f-5d STATES IN ErAs(100)

2004 ◽  
Vol 11 (06) ◽  
pp. 531-539 ◽  
Author(s):  
CHUN-GANG DUAN ◽  
TAKASHI KOMESU ◽  
HAE-KYUNG JEONG ◽  
C. N. BORCA ◽  
WEI-GUO YIN ◽  
...  
Keyword(s):  
Rare Earth ◽  
Energy Loss ◽  
Excitation Energy ◽  
Ab Initio Calculations ◽  
Ab Initio ◽  
Electron Energy Loss Spectroscopy ◽  
Erbium Arsenide ◽  
Earth Systems ◽  
Rare Earth Systems ◽  
Electron Energy Loss

Generally in both elemental and compound rare earth systems, the 4f levels are treated as core states with little interaction with the 5d hybrid conduction and valence band states. In the present study, the band dispersions of the rare-earth pnictide erbium arsenide ( ErAs ) are observed to be perturbed from this expectation. Both photoemission symmetry selection rules and ab initio calculations provide evidences of the 4f - 5d hybridization. This finding is also supported by the f–f resonant transition excitation energy shifts in characteristic electron-energy-loss spectroscopy (EELS).

Using Electron Energy-Loss Spectroscopy (EELS) To Study Rare Earth Elements In Natural Crystals

2000 ◽  
Vol 6 (S2) ◽  
pp. 206-207
Author(s):  
Huifang Xu
Keyword(s):  
Rare Earth ◽  
Energy Loss ◽  
Rare Earth Elements ◽  
Electron Energy ◽  
Energy Resolution ◽  
Electron Energy Loss Spectroscopy ◽  
Relative Concentration ◽  
Chemical Properties ◽  
Similar Chemical ◽  
Electron Energy Loss

Because of similar chemical properties of the rare earth elements (Ree), whole series of the Ree may occur in natural Ree-bearing crystals. Relative concentration of the Ree may vary as the crystallization environments change. Electron energy-dispersive spectroscopy (EDS) associated with TEM is unable to resolve Ree and other coexistence elements, such as Ba nd Ti, because of peak overlap and energy resolution (∼ 150 eV) of EDS. Figure A indicate multiple peaks from Ce only. The Cu peaks are from Cu grid holding the specimen. Electron energy-loss spectroscopy (EELS) with energy resolution of < 1 eV is able to resolve all Ree in natural Ree-bearing crystals.Natural carbonate crystals from a Ree ore deposit were investigated by using EELS associated with field emission-gun (FEG) TEM. The crystals are in a chemical series of BaCO3 - Ree(CO3)F [1]. In Figure B, EEL spectra A and B are from Ce-rich and La-rich bastnaesite (Ree(CO3)F), respectively; spectrum D is from cordylite (BaCO3 (Ree(CO3)F); spectrum E is from huanghoite (BaCO3 Ree(CO3)F), spectrum F is from BaCO3; spectrum C is from an unknown Ree-rich phase.

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