Crystal Structure and Lattice Dynamics of Superionic Copper Selenide Cu2-δSe.

ChemInform ◽  
2004 ◽  
Vol 35 (1) ◽  
Author(s):  
S. A. Danilkin ◽  
A. N. Skomorokhov ◽  
A. Hoser ◽  
H. Fuess ◽  
V. Rajevac ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Lattice Dynamics ◽  
Copper Selenide

Crystal structure and lattice dynamics of superionic copper selenide Cu2−δSe

2003 ◽  
Vol 361 (1-2) ◽  
pp. 57-61 ◽  
Author(s):  
S.A. Danilkin ◽  
A.N. Skomorokhov ◽  
A. Hoser ◽  
H. Fuess ◽  
V. Rajevac ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Lattice Dynamics ◽  
Copper Selenide

Studies of copper selenide ultrafine particles by newly developed gas evaporation method

1990 ◽  
Vol 48 (4) ◽  
pp. 306-307
Author(s):  
Chihiro Kaito ◽  
Yoshio Saito
Keyword(s):  
Crystal Structure ◽  
Ultrafine Particles ◽  
Fine Particles ◽  
Production Method ◽  
Atmospheric Temperature ◽  
Copper Selenide ◽  
Quartz Boat ◽  
Selenium Vapor ◽  
Ar Gas ◽  
Ultra Fine Particles

The direct evaporation of metallic oxides or sulfides does not always given the same compounds with starting material, i.e. decomposition took place. Since the controll of the sulfur or selenium vapors was difficult, a similar production method for oxide particles could not be used for preparation of such compounds in spite of increasing interest in the fields of material science, astrophysics and mineralogy. In the present paper, copper metal was evaporated from a molybdenum silicide heater which was proposed by us to produce the ultra-fine particles in reactive gas as shown schematically in Figure 1. Typical smoke by this method in Ar gas at a pressure of 13 kPa is shown in Figure 2. Since the temperature at a location of a few mm below the heater, maintained at 1400° C , were a few hundred degrees centigrade, the selenium powder in a quartz boat was evaporated at atmospheric temperature just below the heater. The copper vapor that evaporated from the heater was mixed with the stream of selenium vapor,and selenide was formed near the boat. If then condensed by rapid cooling due to the collision with inert gas, thus forming smoke similar to that from the metallic sulfide formation. Particles were collected and studied by a Hitachi H-800 electron microscope.Figure 3 shows typical EM images of the produced copper selenide particles. The morphology was different by the crystal structure, i.e. round shaped plate (CuSe;hexagona1 a=0.39,C=l.723 nm) ,definite shaped p1 ate(Cu5Se4;Orthorhombic;a=0.8227 , b=1.1982 , c=0.641 nm) and a tetrahedron(Cu1.8Se; cubic a=0.5739 nm). In the case of compound ultrafine particles there have been no observation for the particles of the tetrahedron shape. Since the crystal structure of Cu1.8Se is the anti-f1uorite structure, there has no polarity.

Crystal structure and lattice dynamics of hydrogen-loaded austenitic steel

2003 ◽  
Vol 112 ◽  
pp. 407-410
Author(s):  
S. A. Danilkin ◽  
M. Hölzel ◽  
H. Fuess ◽  
H. Wipf ◽  
T. J. Udovic ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Austenitic Steel ◽  
Lattice Dynamics

Temperature evolution of pentacene crystal structure and phonon dynamics

2002 ◽  
Vol 725 ◽  
Author(s):  
Matteo Masino ◽  
Alberto Girlando ◽  
Raffaele G. Della Valle ◽  
Elisabetta Venuti ◽  
Luca Farina ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Thermal Expansion ◽  
Lattice Dynamics ◽  
Low Frequency ◽  
Minimum Potential Energy ◽  
X Ray ◽  
Phonon Dynamics ◽  
Minimum Potential ◽  
Effects Of Temperature ◽  
Experimental Raman Spectrum

AbstractWe investigate the relationships among all currently known X-ray structures of crystalline pentacene by calculating their “inherent” structures of minimum potential energy. We are thus able to show that two distinct bulk crystalline phases of pentacene exist, with very subtle but clear di.erences. We then assess the effects of temperature on the crystal structures, by including both inter- molecular and low-frequency intra-molecular phonons in the framework of quasi harmonic lattice dynamics methods. In this way we properly reproduce the experimental thermal expansion, and obtain a reliable description of the phonon dynamics and of its temperature dependence. The calculated phonon frequencies compare well with the experimental Raman spectrum.

Crystal structure and lattice dynamics of chromium hydrides

2007 ◽  
Vol 430 (1-2) ◽  
pp. 22-28 ◽  
Author(s):  
V.E. Antonov ◽  
A.I. Beskrovnyy ◽  
V.K. Fedotov ◽  
A.S. Ivanov ◽  
S.S. Khasanov ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Lattice Dynamics

Lattice dynamics of thallium iodide

1988 ◽  
Vol 66 (7) ◽  
pp. 630-632 ◽  
Author(s):  
C. Haridass ◽  
R. Sundararajan ◽  
N. Krishnamurthy
Keyword(s):  
Crystal Structure ◽  
Shell Model ◽  
Satisfactory Agreement ◽  
Lattice Dynamics ◽  
Optical Phonons ◽  
Long Wavelength ◽  
Potential Parameters

The long-wavelength optical phonons in orthorhombic TlI are calculated employing a shell model and transferring the potential parameters from cubic TlI and TlBr. Satisfactory agreement between experimental Raman and infrared phonons suggests that the change in the crystal structure alone is the main reason for the redistribution of phonons in the cubic to orthorhombic transition.

Crystal structure and lattice dynamics of ThC0.063

1980 ◽  
Vol 21 (10) ◽  
pp. 4500-4506 ◽  
Author(s):  
W. A. Kamitakahara ◽  
D. Khatamian ◽  
D. T. Peterson ◽  
H. A. Mook
Keyword(s):  
Crystal Structure ◽  
Lattice Dynamics

Dynamics of the crystal structure of tin-based type-I clathrates with different degrees of disorder in their cationic frameworks

2017 ◽  
Vol 19 (40) ◽  
pp. 27725-27730 ◽  
Author(s):  
V. V. Novikov ◽  
K. S. Pilipenko ◽  
A. V. Matovnikov ◽  
N. V. Mitroshenkov ◽  
B. I. Kornev ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Heat Capacity ◽  
Unit Cell Parameter ◽  
Lattice Dynamics ◽  
Cell Parameter ◽  
Unit Cell ◽  
Type I

The temperature dependencies of heat capacity and cubic unit cell parameter for type-I clathrates were obtained to determine the influence of the concentration of vacancies and substituting atoms on the lattice dynamics.

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