scholarly journals X-RAY DIFFRACTION MEASUREMENTS FOR EXPANDED LIQUID MERCURY AROUND THE METAL- NONMETAL TRANSITION REGION

1991 ◽  
Vol 01 (C5) ◽  
pp. C5-39-C5-44 ◽  
Author(s):  
K. TAMURA ◽  
S. HOSOKAWA
Keyword(s):  
Transition Region ◽  
X Ray Diffraction ◽  
X Ray ◽  
Liquid Mercury ◽  
Nonmetal Transition

X-ray diffraction measurements for liquid As2Se3 up to the semiconductor-metal transition region

1992 ◽  
Vol 150 (1-3) ◽  
pp. 35-39 ◽  
Author(s):  
Shinya Hosokawa ◽  
Yoshifumi Sakaguchi ◽  
Kozaburo Tamura
Keyword(s):  
Transition Region ◽  
X Ray Diffraction ◽  
X Ray

Liquid Metals. II. X‐Ray Diffraction by Liquid Mercury and the Distance of Closest Atomic Approach

1955 ◽  
Vol 23 (10) ◽  
pp. 1923-1924 ◽  
Author(s):  
Joseph S. Lukesh ◽  
William H. Howland ◽  
Leo F. Epstein ◽  
Marion D. Powers
Keyword(s):  
Liquid Metals ◽  
X Ray Diffraction ◽  
X Ray ◽  
Liquid Mercury

The microscopic structure of liquid mercury from neutron and X-ray diffraction

2000 ◽  
Vol 276-278 ◽  
pp. 452-453 ◽  
Author(s):  
U. Bafile ◽  
F. Barocchi ◽  
F. Cilloco ◽  
K. Hochgesand ◽  
R. Winter ◽  
...  
Keyword(s):  
Microscopic Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Liquid Mercury ◽  
Structure Of Liquid

Structures of Liquid Mercury and Dilute Liquid Mercury Alloys

1968 ◽  
Vol 23 (7) ◽  
pp. 992-996 ◽  
Author(s):  
N. C. Halder ◽  
C. N. J. Wagner
Keyword(s):  
Liquid State ◽  
Atomic Percent ◽  
Detectable Change ◽  
X Ray Diffraction ◽  
Interference Function ◽  
X Ray ◽  
Liquid Mercury ◽  
The Asymmetry ◽  
Second Peak

The structures of liquid Hg and the dilute liquid Hg alloys with 0.5 and 2 atomic percent Cd, and 0.5 and 1 atomic percent Pb have been studied by x-ray diffraction using a theta-theta diffractometer with monochromator in the diffracted beam. The addition of 0.5 or 2 atomic percent Cd into Hg did not produce any detectable change in the interference function I (K), where K=4π (sin Θ)/λ, whereas small additions of Pb seem to reduce the asymmetry of the first peak of 1(K) which is observed in pure Hg. Small additions of Pb also cause a slight shift of the second peak of l (K) to smaller K-values. The present results have been used to offer a possible interpretation of the structure of Hg as observed in the liquid state.

Stability of fullerenes under hydrothermal conditions

1999 ◽  
Vol 14 (2) ◽  
pp. 323-326 ◽  
Author(s):  
Wojciech L. Suchanek ◽  
Masahiro Yoshimura ◽  
Yury G. Gogotsi
Keyword(s):  
Raman Spectroscopy ◽  
Transition Region ◽  
Hydrothermal Treatment ◽  
Amorphous Carbon ◽  
Reaction Products ◽  
Carbon Addition ◽  
X Ray Diffraction ◽  
Hydrothermal Conditions ◽  
X Ray

Stability of fullerenes C60 under hydrothermal conditions (200–800 °C, 100 MPa, 20 min–168 h) has been investigated. The reaction products have been characterized by Raman spectroscopy and x-ray diffraction. The fullerenes were stable up to 500 °C, but they decomposed immediately at 800 ±C into amorphous carbon. In the transition region between 600 and 750 °C, longer times and higher temperatures of the hydrothermal treatment favored decomposition of C60 with the formation of amorphous carbon. Addition of nickel to the C60–H2OO system neither suppressed hydrothermal decomposition of C60 nor induced formation of other phases, except of the amorphous carbon.

Multirange Fractal Analysis of Discontinuous Microstructure Change of In-40wt.%Sn Melt

2011 ◽  
Vol 704-705 ◽  
pp. 1055-1060
Author(s):  
Yong Zhi Zhou ◽  
Hao Ran Geng ◽  
Mei Li ◽  
Chun Jing Sun ◽  
Zhi Ming Wang
Keyword(s):  
Fractal Dimension ◽  
Transition Region ◽  
Fractal Analysis ◽  
Ultrafine Particles ◽  
Maximum Error ◽  
Fractal Model ◽  
X Ray Diffraction ◽  
Microstructure Change ◽  
X Ray ◽  
Experimental Values

Fractal analysis based on results of high temperature X-ray diffraction experiment was used to study the temporal-spatial properties of particles in In-40wt.%Sn melt. Partially-overlapping multirange fractal structure is observed in In-40wt.%Sn melt, and as temperature decreases from 800°C to 130°C, low fractal dimension was found to range between 2.000 and 2.669, high fractal dimension is still 3.000 without alteration. Moreover, low fractal dimension reveals a discontinuous change between 600°C and 700°C. Fractal characteristics of In-40wt.%Sn melt were correlated with the evolution of microstructure. The discussion was made in detail. Multirange fractal model was proposed to calculate transition region curves of multirange fractals. The results show that values of simulation show good agreement with experimental values, the maximum error is less than 1.3%. From the analysis, the range of the transition region between two fractal regions is speculated to be related with structure properties of metal melts. In addition, ultrafine particles’ aggregation mechanism was used to analyze the fractal morphologies. Keywords: multirange fractal; In-40wt.%Sn melt; microstructure change; X-ray diffraction.

The thermopower of Nd1+xBa2−xCu3Oy in a comparative study of effects of Ba-site doping versus chain-Cu-site doping

1997 ◽  
Vol 12 (11) ◽  
pp. 2907-2912
Author(s):  
B. Fisher ◽  
J. Genossar ◽  
L. Patlagan ◽  
G. M. Reisner ◽  
A. Knizhnik
Keyword(s):  
Electronic Structure ◽  
Comparative Study ◽  
Temperature Dependence ◽  
Thermoelectric Power ◽  
Iodometric Titration ◽  
X Ray Diffraction ◽  
Lanthanide Ion ◽  
X Ray ◽  
Ceramic Samples ◽  
Nonmetal Transition

We report the results of measurements of resistivity up to 300 K and of thermoelectric power up to 400 K on ceramic samples of Nd1+xBa2−xCu3Oy with 0 ≤ x ≤ 0.65. The samples were fully oxygenated; they were characterized by x-ray diffraction and iodometric titration. The results are compared with data from literature reporting on effects of substitutions on the Ba site in 1–2–3 compounds and with our earlier experiments on substitution of Co for chain Cu. The focus is on the metal-nonmetal transition and on the nonmetallic regime in all these systems. Tc and the temperature dependence of S close to the metal-nonmetal transition and in the nonmetallic state seem to be determined by a single parameter, irrespective of the nature of the dopant. This result and its implications on the electronic structure of Rba2Cu3Oy (R = Y, or lanthanide ion) will be discussed.

Sign in / Sign up

Export Citation Format

Share Document