Investigations of the CO-Chemiluminescence in the Reaction of Ketene With Excess Oxygen Atoms

2000 ◽  
Author(s):  
Ghanshyam L. Vaghjiani
Keyword(s):  
Excess Oxygen ◽  
Oxygen Atoms

Carrier Compensation by Excess Oxygen Atoms in Anatase Ti0.94Nb0.06O2+δEpitaxial Thin Films

2010 ◽  
Vol 49 (4) ◽  
pp. 041102 ◽  
Author(s):  
Hiroyuki Nogawa ◽  
Taro Hitosugi ◽  
Akira Chikamatsu ◽  
Shoichiro Nakao ◽  
Yasushi Hirose ◽  
...  
Keyword(s):  
Thin Films ◽  
Excess Oxygen ◽  
Oxygen Atoms

Location of excess oxygen atoms in HgBa2CaCu2O6+δ

1996 ◽  
Vol 262 (1-2) ◽  
pp. 13-20 ◽  
Author(s):  
X. Zhang ◽  
S.Y. Xu ◽  
C.K. Ong
Keyword(s):  
Excess Oxygen ◽  
Oxygen Atoms

New One-Dimensional Commensurate and Incommensurate Structural Forms of Sr-Co Oxide

1996 ◽  
Vol 453 ◽  
Author(s):  
R. Christoffersen ◽  
A. J. Jacobson ◽  
S. L. Hegwood ◽  
L. Liu
Keyword(s):  
Mixed Layer ◽  
Excess Oxygen ◽  
Slow Cooling ◽  
One Dimensional ◽  
Vacancy Ordering ◽  
Structural Modulation ◽  
Hexagonal Perovskites ◽  
Trigonal Prismatic ◽  
Oxygen Atoms

AbstractNew forms of Sr-Co oxide with one-dimensional structures related to mixed-layer hexagonal perovskites have been synthesized and characterized by TEM. Crystals of Sr5Co2O12 grown from molten KOH flux and oxidized under slow cooling have structures based on a 3/2 ratio of mixed [Sr3CoO6] and [Sr3O9] layers. This is the first known structure with layers of this type stacked in a non-integer ratio, yielding chains of face-sharing octahedral and trigonal prismatic Co-sites with a 3 + 1 sequence along the c-axis. In oxygen-deficient Sr5Co2O12−x, the {110} structural modulation of the stoichiometric 5:4 phase becomes rotated to an irrational orientation, possibly in association with vacancy ordering, forming an incommensurate superstructure. For the compound Sr6Co5O15, previously known to have a 1/1 ratio of [Sr3CoO6] and [Sr3O9] layers with a 4 + 1 octahedral/trigonal prismatic site sequence, introduction of excess oxygen atoms leads to formation of a commensurate rhombohedral superlattice in which c is doubled relative to the stoichiometric 6:5 phase.

A Channeling Study of the Structure of U4O9

1971 ◽  
Vol 49 (17) ◽  
pp. 2215-2226 ◽  
Author(s):  
Hj. Matzke ◽  
J. A. Davies ◽  
N. G. E. Johansson
Keyword(s):  
Critical Angle ◽  
Fluorite Structure ◽  
Recent Model ◽  
The Other ◽  
Excess Oxygen ◽  
Wide Angle ◽  
Oxygen Sublattice ◽  
Other Hand ◽  
Rutherford Scattering ◽  
Oxygen Atoms

The channeling behavior of 1-MeV He+ ions and deuterons in U4O9 has been studied in order to provide information on the location of the excess oxygen in the fluorite structure of UO2. Wide-angle (Rutherford) scattering was used to study the channeling behavior with respect to the uranium sublattice, and the 16O(d, p)17O reaction was used to investigate the oxygen sublattice. A pronounced disorder in the oxygen sublattice was indicated by very poor channeling properties and strong dechanneling with increasing depth. The data are thus in conflict with the model incorporating the excess oxygen in the regular interstitial positions along the [Formula: see text] uranium rows; on the other hand, they are consistent with the more recent model of Willis in which the excess oxygen atoms are displaced ~ 1 Å from the regular interstitial sites and displace, in addition, some normal oxygen atoms. Channeling with respect to the uranium sublattice was found to be substantially the same as in stoichiometric UO2—but with a somewhat smaller critical angle, indicating that the uranium atoms may be displaced slightly (i.e. ~ 0.25 Å) by the presence of the excess oxygen.

Phase diagram and effect of excess oxygen atoms on the spin and charge ordering inLa2NiO4+δcrystals

1999 ◽  
Vol 60 (21) ◽  
pp. 14841-14846 ◽  
Author(s):  
Tôru Kyômen ◽  
Masaharu Oguni ◽  
Mitsuru Itoh ◽  
Kenzô Kitayama
Keyword(s):  
Phase Diagram ◽  
Charge Ordering ◽  
Excess Oxygen ◽  
Spin And Charge Ordering ◽  
Oxygen Atoms

Catalytic CO Oxidation on Unreconstructed Cu(110) by Reactive As-Adsorbed Oxygen Atoms below 230 K

1996 ◽  
Vol 100 (3) ◽  
pp. 1048-1054 ◽  
Author(s):  
Tsuyoshi Sueyoshi ◽  
Takehiko Sasaki ◽  
Yasuhiro Iwasawa
Keyword(s):  
Co Oxidation ◽  
Adsorbed Oxygen ◽  
Catalytic Co Oxidation ◽  
Oxygen Atoms

Modification of optical properties of PC-PBT/Cr2O3 and PC-PBT/CdS nanocomposites by gamma irradiation

2020 ◽  
Vol 92 (2) ◽  
pp. 20402
Author(s):  
Kaoutar Benthami ◽  
Mai ME. Barakat ◽  
Samir A. Nouh
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Band Gap ◽  
Color Difference ◽  
Band Gap Energy ◽  
Polybutylene Terephthalate ◽  
Γ Irradiation ◽  
Gap Energy ◽  
Vis Spectroscopy ◽  
Oxygen Atoms

Nanocomposite (NCP) films of polycarbonate-polybutylene terephthalate (PC-PBT) blend as a host material to Cr2O3 and CdS nanoparticles (NPs) were fabricated by both thermolysis and casting techniques. Samples from the PC-PBT/Cr2O3 and PC-PBT/CdS NCPs were irradiated using different doses (20–110 kGy) of γ radiation. The induced modifications in the optical properties of the γ irradiated NCPs have been studied as a function of γ dose using UV Vis spectroscopy and CIE color difference method. Optical dielectric loss and Tauc's model were used to estimate the optical band gaps of the NCP films and to identify the types of electronic transition. The value of optical band gap energy of PC-PBT/Cr2O3 NCP was reduced from 3.23 to 3.06 upon γ irradiation up to 110 kGy, while it decreased from 4.26 to 4.14 eV for PC-PBT/CdS NCP, indicating the growth of disordered phase in both NCPs. This was accompanied by a rise in the refractive index for both the PC-PBT/Cr2O3 and PC-PBT/CdS NCP films, leading to an enhancement in their isotropic nature. The Cr2O3 NPs were found to be more effective in changing the band gap energy and refractive index due to the presence of excess oxygen atoms that help with the oxygen atoms of the carbonyl group in increasing the chance of covalent bonds formation between the NPs and the PC-PBT blend. Moreover, the color intensity, ΔE has been computed; results show that both the two synthesized NCPs have a response to color alteration by γ irradiation, but the PC-PBT/Cr2O3 has a more response since the values of ΔE achieved a significant color difference >5 which is an acceptable match in commercial reproduction on printing presses. According to the resulting enhancement in the optical characteristics of the developed NCPs, they can be a suitable candidate as activate materials in optoelectronic devices, or shielding sheets for solar cells.

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