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Study of the electronic structure of...

Chen, Bo.

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Study of the electronic structure of transition-metal oxides by synchrotron-based x-ray spectroscopies.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Study of the electronic structure of transition-metal oxides by synchrotron-based x-ray spectroscopies./
Author:	Chen, Bo.
Description:	215 p.
Notes:	Source: Dissertation Abstracts International, Volume: 76-03(E), Section: B.
Contained By:	Dissertation Abstracts International76-03B(E).
Subject:	Physics, Radiation. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3645802
ISBN:	9781321352078

Study of the electronic structure of transition-metal oxides by synchrotron-based x-ray spectroscopies.
Chen, Bo.

Study of the electronic structure of transition-metal oxides by synchrotron-based x-ray spectroscopies. - 215 p.

Source: Dissertation Abstracts International, Volume: 76-03(E), Section: B.

Thesis (Ph.D.)--Boston University, 2014.

Transition-metal oxides (TMOs) display numerous fascinating and complex properties, such as mixed-valency, low dimensionality, lattice distortion, and phase transition, etc. These properties arise from the partially filled d- or f-electron shells of TM cations and are often accompanied by the intriguing interplay between degrees of freedom. To understand the complexity of d-electron TMOs, this thesis is primarily focused on studying their underlying electronic structure using x-ray absorption spectroscopy (XAS), x-ray emission spectroscopy (XES), x-ray photoemission spectroscopy (XPS), and resonant inelastic x-ray scattering (RIXS). The measurements at the O K- and TM L-edges are achieved by taking advantage of high-flux and high-resolution synchrotron radiation light with tunable monochromatic photon energy.

ISBN: 9781321352078Subjects--Topical Terms:

1019212
Physics, Radiation.

Study of the electronic structure of transition-metal oxides by synchrotron-based x-ray spectroscopies.
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100 1 $a Chen, Bo. $3 1073835
245 1 0 $a Study of the electronic structure of transition-metal oxides by synchrotron-based x-ray spectroscopies.
300 $a 215 p.
500 $a Source: Dissertation Abstracts International, Volume: 76-03(E), Section: B.
500 $a Adviser: Kevin E. Smith.
502 $a Thesis (Ph.D.)--Boston University, 2014.
520 $a Transition-metal oxides (TMOs) display numerous fascinating and complex properties, such as mixed-valency, low dimensionality, lattice distortion, and phase transition, etc. These properties arise from the partially filled d- or f-electron shells of TM cations and are often accompanied by the intriguing interplay between degrees of freedom. To understand the complexity of d-electron TMOs, this thesis is primarily focused on studying their underlying electronic structure using x-ray absorption spectroscopy (XAS), x-ray emission spectroscopy (XES), x-ray photoemission spectroscopy (XPS), and resonant inelastic x-ray scattering (RIXS). The measurements at the O K- and TM L-edges are achieved by taking advantage of high-flux and high-resolution synchrotron radiation light with tunable monochromatic photon energy.
520 $a Four electronically and structurally distinctive oxides are selected as representative TMOs for investigation in this thesis. To begin with, through a comparative study of WO3 and Na0.67WO3 crystals, the narrowing of the conduction band is observed with Na doping and the core-hole energy shift in the O K-edge XAS process is experimentally determined. Indirect and direct band gaps of photoanode WO3 are measured from the resonant XES with polarization-dependent experimental geometry. The other sodium bronze studied is quasi-one-dimensional beta-Na 0.33V2O5 polycrystalline film. The film stoichiometry, preferential orientation, and orbital anisotropy are well characterized by a variety of photon and electron techniques and compared to density-functional theory (DFT) calculation. The V 3d orbital splitting of beta -Na0.33V2O5 is surveyed by the V L-edge RIXS and compared with isoelectronic beta-Sr0.17V 2O5 regarding distortions to VO6 octahedra.
520 $a Furthermore, the complex electronic structure of Mott insulators La 1-xLuxVO3 is investigated to understand their spin-orbital phase diagram. The effects of rare-earth size on the O 2 p hybridization states and the local crystal field of VO6 octahedron are found to agree with the prediction of DFT calculation and the evolution of crystal structure. The changes of experimental spectra with temperature are associated with Jahn-Teller distortion and orbital ordering due to structural phase transition. Lastly, the band structure and low-energy excitations of spinel MnV2O4 are explored using soft x-ray spectroscopies and theoretical calculations. The presence of Hubbard bands and the mixing between V and Mn 3d states are suggested both experimentally and theoretically.
590 $a School code: 0017.
650 4 $a Physics, Radiation. $3 1019212
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Chemistry, Physical. $3 560527
690 $a 0756
690 $a 0794
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710 2 $a Boston University. $b Physics. $3 3169425
773 0 $t Dissertation Abstracts International $g 76-03B(E).
790 $a 0017
791 $a Ph.D.
792 $a 2014
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3645802