Argon lattice parameter

YCuSb2 was found to crystallize with the HfCuSi2 type with the lattice parameters a = 0.42617, c = 0.9903 (Sologub et al., 1994). An alloy with the nominal composition Y25Cu25Sb5o was prepared by arc melting ingots of the elements in argon and annealed at 1070 K in evacuated quartz tubes for 2 weeks and quenched in water. The materials used were Y 99.9%, Cu 99.9% and Sb 99.9%. 

LaNiSb was found to crystallize with the ZrBeSi type with lattice parameters of a = 0.4404, c = 0.8403 (Hartjes and Jeitschko, 1995 X-ray powder diffraction). Cold-pressed pellets of the ideal composition were arc melted in an atmosphere of argon and annealed at 1120 K for one week. Purities of starting materials were better than 99.9%. 

An early investigation of the TbNiSb compound showed that it had the MgAgAs-type with a = 0.6327 (Dwight, 1974), from an X-ray powder analysis of an alloy arc melted under argon and annealed at 973 K. Pecharsky et al. (1983a) and Hartjes and Jeitschko (1995) confirmed the crystal structure and obtained the lattice parameters as a = 0.6302 and a = 0.6304, respectively, by X-ray powder diffraction. For experimental details, see ScNiSb and LaNiSb respectively. 

Abstract. Gas interstitial fullerenes was produced by precipitation of C6o from the solution in 1,2 dichlorobenzene saturated by O2, N2, or Ar. The structure and chemical composition of the fullerenes was characterized by X-ray powder diffraction analysis, FTIR spectroscopy, thermal desorption mass spectrometry, differential scanning calorimetric and chemical analysis. The images of fullerene microcrystals were analyzed by SEM equipped with energy dispersive X-ray spectroscopy (EDS) attachment. Thermal desorption mass spectroscopy and EDS analysis confirmed the presence of Ar, N and O in C60 specimens. From the diffraction data it has been shown that fullerite with face centered cubic lattice was formed as a result of precipitation. The lattice parameter a was found to enhance for precipitated fullerene microcrystals (a = 14.19 -14.25 A) in comparison with that for pure C60 (a = 14.15 A) due to the occupation of octahedral interstices by nitrogen, oxygen or argon molecules. The phase transition temperature and enthalpy of transition for the precipitated fullerene microcrystals decreased in comparison with pure Cgo- Low temperature wet procedure described in the paper opens a new possibility to incorporate chemically active molecules like oxygen to the fullerene microcrystals. 

The values used for e n, lattice parameters for argon and xenon at 0° K. The values of the parameters used in the calculation are listed in Table I. The potential functions which were obtained when these parameters were substituted in Equation 4.1 are shown in Figures 2 and 3. The potential energy at z — zm is plotted as a function of x (or y), the displacement of an adsorbed atom from the site center parallel to a site edge. It was found that the best simple representation of eT in the neighborhood of a site center on a face-centered cubic crystal is... 

Bienfait, M., Zeppenfeld, P., Dupont-Pavlovsky, N., et al. (2003). Adsorption of argon on carbon nanotube bundles and its influence on the bundle lattice parameter. Phys. Rev. Lett., 91, 035503. 

Ramesh et al. (1987) addressed furthermore the problems associated with the observation of the bcc phase mentioned above. They note that the bcc phase, in all reported cases, was observed by the selected area diffraction (SAD) technique, using argon ion-milled specimens. SAD using a 0.5 j.m aperture has been carried out by Ramesh et al. on argon ion-milled specimens. When the SAD aperture is placed over the matrix only, Ramesh et al. observed a bcc ring pattern with a lattice parameter of 0.29 nm. However, when the SAD aperture was placed over the... 

Nd2LiSi2 was found to be isostructural with the ordered UjSij-type. The space group is P4/mbm and lattice parameters are a = 7.370, c = 4.242 the densities compare as p = 5.02, p = 5.067 kg/dm (Steinberg and Schuster, 1979 X-ray powder diffraction data). Samples were prepared by heating elemental mixtures of a nominal composition NdLijSi in Ta crucibles under argon (5 min at 1030 °C). The... 

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