X-Ray Absorption Spectroscopy and Optical Absorption Studies of the Growth of CdS Nanocrystals in Glass

1994 ◽  
Vol 358 ◽  
Author(s):  
P. D. Persans ◽  
L. B. Lurio ◽  
J. Pant ◽  
R. J. Olsson ◽  
H. Yukselici ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Optical Absorption ◽  
Nearest Neighbor ◽  
Nearest Neighbors ◽  
Cds Nanoparticles ◽  
X Ray ◽  
Cds Nanocrystals ◽  
Optical Absorption Peak ◽  
Absorption Studies ◽  
X Ray Absorption

ABSTRACTWe have measured and analyzed optical absorption, Raman scattering and x-ray absorption spectra of CdS nanocrystals grown by solid-state reaction in a borosilicate glass. We observe the appearance and growth of an optical absorption peak which is attributed to CdS nanoparticles. Using x-ray absorption we quantify the progressive replacement of O nearest neighbors of Cd by S with heat treatment and the appearance and growth of a well-defined second nearest neighbor peak.

Self-Connected Cds Nanocrystals as Precursors for Anisotropic Semiconducting Films

1994 ◽  
Vol 346 ◽  
Author(s):  
A. Chemseddine
Keyword(s):  
Heat Treatment ◽  
Optical Absorption ◽  
Band Gap ◽  
Polymeric Material ◽  
Fibrous Material ◽  
X Ray Diffraction ◽  
X Ray ◽  
Size Dependent ◽  
Cds Nanocrystals ◽  
Cds Films

ABSTRACTMonosized and anisotropically capped CdS nanocrystals have the property to self-connect into a polymeric material. The viscosity of this fibrous material can be adjusted to fabricate texturized and homogeneous coatings. These films can be thermally converted into pure CdS films. Based on the size dependent band gap of this semiconductor, the absorbance of the film can be fine-tuned through the size of the particle-precursor or by controlling the film heat treatment. The evolution of the film nanostructure with temperature was investigated by optical absorption, DTA, SEM and X-ray diffraction techniques.

EFFECT OF HEAT TREATMENT ON MICROSTRUCTURE AND MAGNETOSTRICTIVE PROPERTY OF MELT-SPUN Fe85Ga15 RIBBONS

2013 ◽  
Vol 27 (30) ◽  
pp. 1350174 ◽  
Author(s):  
HAO LIU ◽  
HAIOU WANG ◽  
MENGXIONG CAO ◽  
WEISHI TAN ◽  
YANGGUANG SHI ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Fine Structure ◽  
High Resolution ◽  
Nearest Neighbor ◽  
Annealed Sample ◽  
X Ray Diffraction ◽  
X Ray ◽  
Absorption Fine ◽  
Melt Spun ◽  
X Ray Absorption

In order to study the microstructure of Fe – Ga alloy, Fe 85 Ga 15 ribbons prepared with different wheel velocity were studied by high resolution X-ray diffraction (HRXRD) and extend X-ray absorption fine structure (EXAFS). HRXRD patterns showed that only disordered A 2 phase was observed in as-cast Fe 85 Ga 15 alloy. A modified- DO 3 phase was detected in all of the melt spun samples. The HRXRD associated with EXAFS results indicated that Ga atoms were located as second-nearest neighbor along [100] orientation. A little DO 3 phase was found in ribbons annealed at 1000°C under 0.06 MPa Ar atmosphere. The result of magnetostriction measurement revealed that in the ribbon prepared with higher wheel velocity, more modified- DO 3 phase will enhance the magnetostriction. DO 3 phase in the annealed sample will deteriorate the magnetostrictive properties of Fe – Ga ribbons.

scholarly journals Effect of germanium auto-diffusion on the bond lengths of Ga and P atoms in GaP/Ge(111) investigated by using X-ray absorption spectroscopy

2021 ◽  
Vol 28 (2) ◽  
pp. 480-489
Author(s):  
R. Roychowdhury ◽  
P. Rajput ◽  
Shailendra Kumar ◽  
R. Kumar ◽  
A. Bose ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Residual Strain ◽  
Tensile Strain ◽  
Nearest Neighbor ◽  
Secondary Ion Mass Spectrometry ◽  
Nearest Neighbors ◽  
X Ray ◽  
Bond Lengths ◽  
Out Of Plane ◽  
X Ray Absorption

The germanium auto-diffusion effects on the inter-atomic distance between the nearest neighbors of the Ga atom in GaP epilayers are investigated using high-resolution X-ray diffraction (HRXRD) and X-ray absorption spectroscopy. The GaP layers grown on Ge (111) are structurally coherent and relaxed but they show the presence of residual strain which is attributed to the auto-diffusion of Ge from the results of secondary ion mass spectrometry and electrochemical capacitance voltage measurements. Subsequently, the inter-atomic distances between the nearest neighbors of Ga atom in GaP are determined from X-ray absorption fine-structure spectra performed at the Ga K-edge. The estimated local bond lengths of Ga with its first and second nearest neighbors show asymmetric variation for the in-plane and out-of-plane direction of GaP/Ge(111). The magnitude and direction of in-plane and out-of-plane microscopic residual strain present in the GaP/Ge are calculated from the difference in bond lengths which explains the presence of macroscopic residual tensile strain estimated from HRXRD. Modified nearest neighbor configurations of Ga in the auto-diffused GaP epilayer are proposed for new possibilities within the GaP/Ge hetero-structure, such as the conversion from indirect to direct band structures and engineering the tensile strain quantum dot structures on (111) surfaces.

In Situ X-Ray Absorption Studies of the Electrochemical Reduction of Hydroxocobalamin

1997 ◽  
Vol 7 (C2) ◽  
pp. C2-619-C2-620 ◽  
Author(s):  
M. Giorgett ◽  
I. Ascone ◽  
M. Berrettoni ◽  
S. Zamponi ◽  
R. Marassi
Keyword(s):  
Electrochemical Reduction ◽  
X Ray ◽  
Absorption Studies ◽  
X Ray Absorption

X-ray Absorption Studies of Ruthenium Silicide

1993 ◽  
Vol 32 (S2) ◽  
pp. 746
Author(s):  
A. BZowski ◽  
T. K. Sham ◽  
B. X. Yang ◽  
J. M. Chen
Keyword(s):  
X Ray ◽  
Absorption Studies ◽  
Ruthenium Silicide ◽  
X Ray Absorption

Ru L‐edge x‐ray absorption studies of the formation of Ru–Cu bimetallic aggregates on Cu(100)

1991 ◽  
Vol 95 (12) ◽  
pp. 8725-8731 ◽  
Author(s):  
T. K. Sham ◽  
T. Ohta ◽  
T. Yokoyama ◽  
Y. Takata ◽  
Y. Kitajima ◽  
...  
Keyword(s):  
X Ray ◽  
Absorption Studies ◽  
X Ray Absorption

Energy Band Gap Studies of CdS Nanomaterials

2008 ◽  
Vol 3 ◽  
pp. 97-102 ◽  
Author(s):  
Dinu Patidar ◽  
K.S. Rathore ◽  
N.S. Saxena ◽  
Kananbala Sharma ◽  
T.P. Sharma
Keyword(s):  
Optical Absorption ◽  
Band Gap ◽  
Energy Band ◽  
Chemical Method ◽  
Optical Absorption Spectroscopy ◽  
Cds Nanoparticles ◽  
X Ray Diffraction ◽  
Energy Band Gap ◽  
X Ray ◽  
Simple Chemical

The CdS nanoparticles of different sizes are synthesized by a simple chemical method. Here, CdS nanoparticles are grown through the reaction of solution of different concentration of CdCl2 with H2S. X-ray diffraction pattern confirms nano nature of CdS and has been used to determine the size of particle. Optical absorption spectroscopy is used to measure the energy band gap of these nanomaterials by using Tauc relation. Energy band gap ranging between 3.12 eV to 2.47 eV have been obtained for the samples containing the nanoparticles in the range of 2.3 to 6.0 nm size. A correlation between the band gap and size of the nanoparticles is also established.

Technique for the preparation of solid specimens for x‐ray absorption studies

1980 ◽  
Vol 51 (11) ◽  
pp. 1579-1580 ◽  
Author(s):  
E. D. Eanes ◽  
Jonathan L. Costa ◽  
Alan MacKenzie ◽  
William K. Warburton
Keyword(s):  
X Ray ◽  
Absorption Studies ◽  
X Ray Absorption
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