Observation of Strong Temperature Dependence and Direct-Transition Effects in Angle-Resolved X-Ray Photoelectron Spectra from the Valence Bands of Single-Crystal Tungsten

1980 ◽  
Vol 44 (13) ◽  
pp. 895-899 ◽  
Author(s):  
Z. Hussain ◽  
S. Kono ◽  
R. E. Connelly ◽  
C. S. Fadley
Keyword(s):  
Single Crystal ◽  
Temperature Dependence ◽  
Photoelectron Spectra ◽  
Strong Temperature Dependence ◽  
Direct Transition ◽  
X Ray ◽  
Transition Effects ◽  
Valence Bands

Temperature dependence of the AV3O7 (A = Ca, Sr) structure

2007 ◽  
Vol 63 (6) ◽  
pp. 836-842 ◽  
Author(s):  
Sebastian Prinz ◽  
Karine M. Sparta ◽  
Georg Roth
Keyword(s):  
Single Crystal ◽  
Temperature Dependence ◽  
Crystal Structures ◽  
Room Temperature ◽  
X Ray Diffraction ◽  
X Ray ◽  
Space Groups ◽  
Temperature Ranges ◽  
First Time

The V4+ (spin ½) oxovanadates AV3O7 (A = Ca, Sr) were synthesized and studied by means of single-crystal X-ray diffraction. The room-temperature structures of both compounds are orthorhombic and their respective space groups are Pnma and Pmmn. The previously assumed structure of SrV3O7 has been revised and the temperature dependence of both crystal structures in the temperature ranges 297–100 K and 315–100 K, respectively, is discussed for the first time.

STUDY OF LOCAL STRUCTURE IN UNDER-DOPED La2-xSrxCuO4-y BY POLARIZED EXAFS

2002 ◽  
Vol 16 (11n12) ◽  
pp. 1641-1648 ◽  
Author(s):  
K. B. GARG ◽  
C. SANCHEZ ◽  
J. GARCIA ◽  
J. BLASCO ◽  
R. K. SINGHAL ◽  
...  
Keyword(s):  
Fine Structure ◽  
Single Crystal ◽  
Temperature Dependence ◽  
Local Structure ◽  
X Ray ◽  
Absorption Fine ◽  
Local Lattice ◽  
X Ray Absorption

Temperature dependence of local structure of the CuO 2 plane has been studied by in plane polarized (E//ab) Cu K-edge extended X-ray absorption fine structure (EXAFS) experiments on an under-doped single crystal of superconducting La1.87Sr0.13CuO 4-y system with T c =32  K . The temperature dependence of the Debye–Waller factors for the Cu-O and Cu-La/Sr pairs are determined. We find that the motion of Cu and O atoms in the Cu-O bond is partially correlated at higher temperatures, going over to an uncorrelated motion at lower temperatures. The results are discussed in terms of the local lattice instabilities and stripes as reported in other systems.

Single-ion approach to the interpretation of the x-ray photoelectron spectra of the valence bands of monoxides of 3d elements

1997 ◽  
Vol 39 (6) ◽  
pp. 948-954 ◽  
Author(s):  
L. D. Finkel’shtein ◽  
E. I. Zabolotskii ◽  
V. R. Galakhov ◽  
É. Z. Kurmaev ◽  
S. Ulenbrok ◽  
...  
Keyword(s):  
Photoelectron Spectra ◽  
X Ray ◽  
3D Elements ◽  
Valence Bands

scholarly journals Crystal Structure and Dielectric Property of Endohedral Lithium Fullerene

2014 ◽  
Vol 70 (a1) ◽  
pp. C195-C195
Author(s):  
Shinobu Aoyagi ◽  
Kunihisa Sugimoto ◽  
Hiroshi Okada ◽  
Norihisa Hoshino ◽  
Tomoyuki Akutagawa
Keyword(s):  
Crystal Structure ◽  
Phase Transition ◽  
Dielectric Property ◽  
Low Temperature ◽  
Dielectric Permittivity ◽  
Single Crystal ◽  
Temperature Dependence ◽  
Structure Analysis ◽  
X Ray ◽  
Dielectric Phase

Endohedral lithium fullerene Li+@C60 can have a dielectric polarization by the off-centered location of the Li+ cation inside the C60 cage. The x-ray structure analysis of the PF6– salt [Li@C60](PF6) revealed that the Li+ cation occupies two off-centered equivalent positions at 20 K and hence the crystal is non-polar [1]. The disordered structure at low temperature is explained by a static orientation disorder of polar Li+@C60 cations and/or a dynamic tunneling of the Li+ cation inside the C60 cage. The Li+ tunneling would be suppressed by an intermolecular interaction at lower temperature and a dielectric phase transition might be induced. We reveal the dielectric property and crystal structure of [Li@C60](PF6) below 20 K in this study. The temperature dependence of the dielectric permittivity was measured for the single crystal down to 9 K. The dielectric permittivity increases with decreasing temperature according to the Curie-Weiss law. Such a behavior was also observed in H2O@C60 crystal but not in empty C60 crystal [2]. No dielectric phase transition was observed in H2O@C60 down to 8 K. In contrast, a dielectric anomaly suggesting a phase transition was observed in [Li@C60](PF6) around 18 K. The single-crystal x-ray diffraction experiment below 20 K was also performed at SPring-8 BL02B1. The crystal has a cubic structure at 20 K [1]. The temperature dependence of the cubic lattice constant shows no anomaly around 18 K. However, diffraction peaks that are forbidden for the given structure appear below 18 K. Thus the crystal symmetry is lowered by the dielectric phase transition. We present the result of the crystal structure analysis of the newly discovered low-temperature phase.

Temperature dependence of structural parameters in oxide-ion-conducting Nd9.33(SiO4)6O2: single crystal X-ray studies from 295 to 900K

2004 ◽  
Vol 177 (12) ◽  
pp. 4451-4458 ◽  
Author(s):  
Hiroki Okudera ◽  
Akira Yoshiasa ◽  
Yuuji Masubuchi ◽  
Mikio Higuchi ◽  
Shinichi Kikkawa
Keyword(s):  
Single Crystal ◽  
Temperature Dependence ◽  
Structural Parameters ◽  
X Ray ◽  
Ion Conducting ◽  
Oxide Ion

Ionic Conductivity of Li2ZnTi3O8 Single Crystal

2011 ◽  
Vol 497 ◽  
pp. 26-30 ◽  
Author(s):  
Shinichi Furusawa ◽  
Hiroshi Ochiai ◽  
Khoji Murayama
Keyword(s):  
Ionic Conductivity ◽  
Single Crystal ◽  
Temperature Dependence ◽  
Single Crystals ◽  
Powder Diffraction ◽  
Floating Zone ◽  
Zinc Titanate ◽  
X Ray ◽  
Temperature Range ◽  
First Time

Single crystals of lithium zinc titanate (Li2ZnTi3O8) were grown in a double-mirror type optical floating-zone furnace for the first time. Single crystals were characterized by X-ray powder diffraction and Laue measurements. The ionic conductivity of the single crystals was measured in the temperature range of 400–700 K. Below 600 K, the ionic conductivity of the single crystal is one to two orders of magnitude higher than that of polycrystalline Li2ZnTi3O8. In the temperature range of 550–600 K, the temperature dependence of the ionic conductivity shows non-Arrhenius behaviour.

Temperature dependence of the silver distribution in Ag2MnP2S6 by single crystal X-ray diffraction

1993 ◽  
Vol 203 (2) ◽  
Author(s):  
A. van der Lee ◽  
F. Boucher ◽  
M. Evain ◽  
R. Brec
Keyword(s):  
Single Crystal ◽  
Temperature Dependence ◽  
Layered Compound ◽  
X Ray Diffraction ◽  
X Ray

AbstractThe Ag distribution in the layered compound Ag

Site-specific valence-band X-ray photoelectron spectra of a SrTiO3 single-crystal by X-ray standing wave technique

2005 ◽  
Vol 136 (7) ◽  
pp. 375-379 ◽  
Author(s):  
Tatsuo Fujii ◽  
Masahiro Kimura ◽  
Hideki Yoshikawa ◽  
Sei Fukushima
Keyword(s):  
Single Crystal ◽  
Valence Band ◽  
Standing Wave ◽  
Photoelectron Spectra ◽  
Site Specific ◽  
X Ray ◽  
Wave Technique
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