Existence of tetrahedral site symmetry about Ge atoms in a single-crystal film of Ge2Sb2Te5 found by x-ray fluorescence holography

2007 ◽  
Vol 90 (13) ◽  
pp. 131913 ◽  
Author(s):  
S. Hosokawa ◽  
T. Ozaki ◽  
K. Hayashi ◽  
N. Happo ◽  
M. Fujiwara ◽  
...  
RSC Advances ◽  
2016 ◽  
Vol 6 (113) ◽  
pp. 112403-112408 ◽  
Author(s):  
Menglong Zhu ◽  
Lu Lyu ◽  
Dongmei Niu ◽  
Hong Zhang ◽  
Shitan Wang ◽  
...  

The effect of a MoO3 buffer layer inserted between 2,7-dioctyl[1]benzothieno[3,2-b]benzothiophene (C8-BTBT) and Co single-crystal film has been investigated using X-ray photoemission spectroscopy (XPS) and ultraviolet photoemission spectroscopy (UPS).


2009 ◽  
Vol 56 (3) ◽  
pp. 1412-1418 ◽  
Author(s):  
Thierry Martin ◽  
Paul-Antoine Douissard ◽  
Maurice Couchaud ◽  
Angelica Cecilia ◽  
Tilo Baumbach ◽  
...  

Author(s):  
Takashi Mochiku ◽  
Yoshitaka Matsushita ◽  
Nikola Subotić ◽  
Takanari Kashiwagi ◽  
Kazuo Kadowaki

RhPb2 (rhodium dilead) is a superconductor crystallizing in the CuAl2 structure type (space group I4/mcm). The Rh and Pb atoms are located at the 4a (site symmetry 422) and 8h (m.2m) sites, respectively. The crystal structure is composed of [RhPb8] antiprisms, which share their square faces along the c axis and the edges in the direction perpendicular to the c axis. We have succeeded in growing single crystals of RhPb2 and have re-determined the crystal structure on basis of single-crystal X-ray diffraction data. In comparison with the previous structure studies using powder X-ray diffraction data [Wallbaum (1943). Z. Metallkd. 35, 218–221; Havinga et al. (1972). J. Less-Common Met. 27, 169–186], the current structure analysis of RhPb2 leads to more precise unit-cell parameters and fractional coordinates, together with anisotropic displacement parameters for the two atoms. In addition and likewise different from the previous studies, we have found a slight deficiency of Rh in RhPb2, leading to a refined formula of Rh0.950 (9)Pb2.


2015 ◽  
Vol 79 (3) ◽  
pp. 635-647 ◽  
Author(s):  
G. D. Bromiley ◽  
G. D. Gatta ◽  
T. Stokes

AbstractManganese incorporation in synthetic hercynite, and partitioning between hercynite and silicate melt synthesized at 1.0 GPa, 1250°C, and at an fO2 buffered by Fe–FeO, has been studied by X-ray absorption spectroscopy and single-crystal X-ray structure refinement. Spectra indicate the presence of both Mn2+ and Mn3+ (and possibly also Mn4+) in synthetic hercynite and partitioning of Mn2+ into the melt phase, and Mn3+ into hercynite, respectively, under run conditions. X-ray refinement is consistent with partial disorder of Fe and Al across tetrahedral and octahedral sites. A higher than expected degree of Fe-Al disorder in the Mn-bearing hercynite can be explained by preferential incorporation of Mn2+ onto the tetrahedral site, and indicates that Fe-Al disorder in pure, stoichiometric hercynite cannot necessarily be used to determine closure temperatures in natural spinel. However, partitioning of Mn2+ and Mn3+ between melt and hercynite suggests that Mn incorporation in hercynite could be used as a measure of fO2 conditions in magmas during spinel crystallization.


ACS Nano ◽  
2020 ◽  
Vol 14 (11) ◽  
pp. 15605-15615
Author(s):  
Yangguang Zhong ◽  
Kun Liao ◽  
Wenna Du ◽  
Jiangrui Zhu ◽  
Qiuyu Shang ◽  
...  

1970 ◽  
Vol 13 (2) ◽  
pp. 264-266
Author(s):  
L. I. Anatychuk ◽  
V. T. Dimitrashchuk ◽  
O. Ya. Luste ◽  
E. B. Tereshchenko

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