X-ray photoelectron study of temperature effect on the valence state of Mn in single crystal YMnO 3

2014 ◽  
Vol 195 ◽  
pp. 1-7 ◽  
Author(s):  
A.G. Kochur ◽  
A.T. Kozakov ◽  
K.A. Googlev ◽  
A.V. Nikolskii
Keyword(s):  
Single Crystal ◽  
Temperature Effect ◽  
Valence State ◽  
X Ray ◽  
Photoelectron Study

scholarly journals Valence self-regulation of sulfur in nanoclusters

2019 ◽  
Vol 5 (11) ◽  
pp. eaax7863 ◽  
Author(s):  
Xi Kang ◽  
Fengqing Xu ◽  
Xiao Wei ◽  
Shuxin Wang ◽  
Manzhou Zhu
Keyword(s):  
Mass Spectrometry ◽  
Single Crystal ◽  
Diffraction Analysis ◽  
Valence State ◽  
Self Regulation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Capping Ligands ◽  
First Time

The valence self-regulation of sulfur from the “−2” valence state in thiols to the “−1” valence state in hydroxylated thiolates has been accomplished using the Pt1Ag28 nanocluster as a platform—the first time that the “−1” valent sulfur has been detected as S−1. Two previously unknown nanoclusters, Pt1Ag28(SR)20 and Pt1Ag28(SR)18(HO-SR)2 (where SR represents 2-adamantanethiol), have been synthesized and characterized—in the latter nanocluster, the presence of hydroxyl induces the valence regulation of two special S atoms from “−2” (in SR) to “−1” valence state in the HO-S(Ag)R. Because of the contrasting nature of the capping ligands in these two nanoclusters [i.e., only SR in Pt1Ag28(SR)20 or both SR- and HO-SR- in Pt1Ag28(SR)18(HO-SR)2], they exhibit differing shell architectures, even though their cores (Pt1Ag12) are in the same icosahedral configuration. Single-crystal x-ray diffraction analysis revealed their 1:1 cocrystallization, and mass spectrometry verified the presence of hydroxyls on Pt1Ag28(SR)18(HO-SR)2.

Crystal Structure of the Ternary Arsenide CeNi1.91As1.94

2002 ◽  
Vol 57 (12) ◽  
pp. 1359-1366 ◽  
Author(s):  
V. Babizhetskyy ◽  
E. Le Für ◽  
J. Y. Pivan ◽  
R. Guérin
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Structure Determination ◽  
Valence State ◽  
Single Crystal Structure ◽  
Crystal Structure Determination ◽  
X Ray ◽  
Structural Modifications ◽  
Atomic Displacements

A new ternary intermetallic has been obtained in the Ce-Ni-As system, the composition of which is CeNi1.91As1.94 from X-ray single crystal structure determination. The structure is derived from the CaBe2Ge2 type with the following relations between the vectors a, b, and c of the cell and a0, b0, and c0 of the subcell: a = 2a0 - 2b0; b = 2a0 + 2b0 and c = 2c0 (V = 16 V0). The structure takes its origin from compositional and displacive mechanisms. The major structural modifications occur in the nickel-arsenic layers (two per cell) where the nickel atoms are in “square” pyramidal As sites. Moreover, the slight atomic displacements in these layers that develop in the ab plane, lead to As8 clusters, each formed by a central part As4 linked by four apical As ligands. These clusters constrain arsenic to adopt a valence state higher than -3 which in turn involves the lowering of the counterbalancing charge from the nickel substructure. The structure of CeNi1.91As1.94 is compared in details with that of the previously reported URh1.6As1.9.

Electron Microscopy of Shock Loaded Polycrystalline Beryllium

1974 ◽  
Vol 32 ◽  
pp. 506-507 ◽  
Author(s):  
J. M. Galbraith ◽  
L. E. Murr ◽  
A. L. Stevens
Keyword(s):  
Electron Microscopy ◽  
Wave Propagation ◽  
Structural Change ◽  
Single Crystal ◽  
Diffraction Pattern ◽  
Shock Loading ◽  
Slip Systems ◽  
Compression Tests ◽  
X Ray Diffraction ◽  
X Ray

Uniaxial compression tests and hydrostatic tests at pressures up to 27 kbars have been performed to determine operating slip systems in single crystal and polycrystal1ine beryllium. A recent study has been made of wave propagation in single crystal beryllium by shock loading to selectively activate various slip systems, and this has been followed by a study of wave propagation and spallation in textured, polycrystal1ine beryllium. An alteration in the X-ray diffraction pattern has been noted after shock loading, but this alteration has not yet been correlated with any structural change occurring during shock loading of polycrystal1ine beryllium.This study is being conducted in an effort to characterize the effects of shock loading on textured, polycrystal1ine beryllium. Samples were fabricated from a billet of Kawecki-Berylco hot pressed HP-10 beryllium.

Crystal structure of an inclusion complex between chiral monoaza-15-crown-5 and S(–)-1-phenyl-ethyl ammonium percholorate

2003 ◽  
Vol 218 (5) ◽  
Author(s):  
Süheyla Özbey ◽  
F. B. Kaynak ◽  
M. Toğrul ◽  
N. Demirel ◽  
H. Hoşgören
Keyword(s):  
Crystal Structure ◽  
Inclusion Complex ◽  
Single Crystal ◽  
X Ray Diffraction ◽  
Space Group ◽  
X Ray ◽  
New Type

AbstractA new type of inclusion complex, S(–)-1 phenyl ethyl ammonium percholorate complex of R-(–)-2-ethyl - N - benzyl - 4, 7, 10, 13 - tetraoxa -1- azacyclopentadecane, has been prepared and studied by NMR, IR and single crystal X-ray diffraction techniques. The compound crystallizes in space group

Sign in / Sign up

Export Citation Format

Share Document