Size Dependent Structural, Vibrational, and Luminescence Properties of Nanocrystalline LiIn(WO4)2:Cr3+

2008 ◽  
Vol 8 (7) ◽  
pp. 3545-3554 ◽  
Author(s):  
K. Hermanowicz ◽  
M. Maczka ◽  
P. E. Tomaszewski ◽  
L. Krajczyk ◽  
J. Hanuza ◽  
...  
Keyword(s):  
Particle Size ◽  
Structural Changes ◽  
Pechini Method ◽  
Phonon Coupling ◽  
Covalent Character ◽  
X Ray ◽  
Electron Transmission ◽  
Size Dependent ◽  
Electron Phonon Coupling ◽  
Critical Particle Size

X-ray, electron transmission spectroscopy, vibrational and luminescence studies of LiIn(WO4)2:Cr3+ nanoparticles prepared by Pechini method are reported. On annealing the sample several structural changes were observed resulting in a creation of three new, previously unknown polymorphs. It was shown that this tungstate undergoes two size-induced phase transitions from the structure similar to LiFe(WO4)2 into the structure similar to LiYb(WO4)2 and then into the structure of LiGa(WO4)2 type. These transitions occur for the critical particle size of about 100 and 30 nm, and they could be attributed mainly to some changes in the distribution of the sites occupied by Li+ and In3+ ions. Luminescence studies revealed decrease of the covalent character of chromium environment and electron–phonon coupling strength with decreasing size of the nanoparticles.

Size-Dependent Electron–Phonon Coupling in Monocrystalline Gold Nanoparticles

ACS Photonics ◽  
2021 ◽  
Author(s):  
Yannic U. Staechelin ◽  
Dominik Hoeing ◽  
Florian Schulz ◽  
Holger Lange
Keyword(s):  
Gold Nanoparticles ◽  
Phonon Coupling ◽  
Size Dependent ◽  
Electron Phonon Coupling

Size dependent behavior of Fe3O4crystals during electrochemical (de)lithiation: an in situ X-ray diffraction, ex situ X-ray absorption spectroscopy, transmission electron microscopy and theoretical investigation

2017 ◽  
Vol 19 (31) ◽  
pp. 20867-20880 ◽  
Author(s):  
David C. Bock ◽  
Christopher J. Pelliccione ◽  
Wei Zhang ◽  
Janis Timoshenko ◽  
K. W. Knehr ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Structural Changes ◽  
Ex Situ ◽  
X Ray Diffraction ◽  
X Ray ◽  
Size Dependent ◽  
Transmission Electron ◽  
Dependent Behavior ◽  
X Ray Absorption

Crystal and atomic structural changes of Fe3O4upon electrochemical (de)lithiation were determined.

scholarly journals Temperature-dependent electron-phonon coupling in La2−xSrxCuO4probed by femtosecond x-ray diffraction

2013 ◽  
Vol 88 (5) ◽  
Author(s):  
B. Mansart ◽  
M. J. G. Cottet ◽  
G. F. Mancini ◽  
T. Jarlborg ◽  
S. B. Dugdale ◽  
...  
Keyword(s):  
Phonon Coupling ◽  
X Ray Diffraction ◽  
Temperature Dependent ◽  
X Ray ◽  
Electron Phonon Coupling

scholarly journals Resonant inelastic x-ray scattering probes the electron-phonon coupling in the spin liquid κ -(BEDT-TTF) 2Cu2(CN)3

2017 ◽  
Vol 96 (18) ◽  
Author(s):  
V. Ilakovac ◽  
S. Carniato ◽  
P. Foury-Leylekian ◽  
S. Tomić ◽  
J.-P. Pouget ◽  
...  
Keyword(s):  
Spin Liquid ◽  
Phonon Coupling ◽  
X Ray ◽  
X Ray Scattering ◽  
Electron Phonon Coupling ◽  
Ray Scattering

X-Ray Profile Analysis of 12% Chromium Stainless Steel

1993 ◽  
Vol 37 ◽  
pp. 351-358
Author(s):  
Zenjxo Yajima ◽  
Ken-ichi Ishikawa ◽  
Toshihiko Sasaki ◽  
Yukio Hirose
Keyword(s):  
Particle Size ◽  
Structural Changes ◽  
Lattice Strain ◽  
Profile Analysis ◽  
Good Method ◽  
Small Particle Size ◽  
Line Broadening ◽  
X Ray ◽  
Diffraction Peaks ◽  
Chromium Stainless Steel

X-ray line broadening is caused by variations in lattice strain and small particle size. When hydrogen is introduced into the steel by the electrolytica! method, structural changes are observed. X-ray line broadening is a suitable measurement in such cases. The Warren and Averbach Fourier analysis is a good method for line broadening studies. In this method, strain and particle size effects can be separated because broadening due to particle size is independent of order of the diffraction peaks, while broadening due to strain is not.

OPTICAL ABSORPTION IN QUANTUM DOTS

2002 ◽  
Vol 16 (10) ◽  
pp. 1489-1497 ◽  
Author(s):  
PHANI MURALI KRISHNA ◽  
SOMA MUKHOPADHYAY ◽  
ASHOK CHATTERJEE
Keyword(s):  
Quantum Dots ◽  
Optical Absorption ◽  
Optical Absorption Coefficient ◽  
Coupling Constant ◽  
Phonon Coupling ◽  
Size Dependent ◽  
Small Quantum ◽  
Electron Phonon Coupling ◽  
The One ◽  
Strong Confinement

The optical absorption behaviour of polar semiconductor quantum dots has been investigated in the strong confinement regime using the adiabatic approximation of Landau and Pekar. It has been shown that optical absorption coefficient becomes strongly size dependent below a certain value of the confinement length and also exhibits interesting crossing behaviour when studied as a function of the electron–phonon coupling constant for different values of the confinement length. It has furthermore been shown that the ratio of the one-phonon part of the oscillator strength to the zero-phonon contribution can be significantly large in a small quantum dot and can also exhibit an interesting minimum structure at certain value of the confinement length for intermediate electron–phonon coupling.

Investigation of Local Structures Around Luminescent Centers in Doped Nanocrystal Phosphors

1995 ◽  
Vol 405 ◽  
Author(s):  
Y. L. Soo ◽  
S. W. Huang ◽  
Z. H. Ming ◽  
Y. H. Kao ◽  
E. Goldburt ◽  
...  
Keyword(s):  
Optical Properties ◽  
Structural Changes ◽  
Structural Information ◽  
The Novel ◽  
X Ray ◽  
Local Structures ◽  
Size Dependent ◽  
Luminescent Centers ◽  
X Ray Absorption ◽  
Mn Doped

AbstractExtended x-ray absorption fine structure (EXAFS) technique has been employed to investigate the local structures around luminescent centers in nanocrystals of Mn-doped ZnS and Tb-doped Y2O3. Size-dependent local structural changes around Mn luminescent centers have been found in Mn-doped nanocrystals of ZnS by using Mn K-edge EXAFS. Local structures around Tb investigated by Tb Li-edge EXAFS also show substantial differences between bulk and nanocrystal samples. This structural information is useful for understanding the novel optical properties of doped nanocrystals.

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