Applicability study of the structure-factor phase method for determining the polarity of binary semiconductors.

The structure-factor phase method of convergent-beam electron diffraction (CBED) has been widely applied as an effective tool in determining the polarity of binary compound materials, for example, the typical sphalerite material, GaAs. However, its validity on other polar materials is still unknown. In this paper we extensively investigated its potential applicability onto 11 AB-type semiconductors by dynamical simulations of CBED.

Experimental study of lattice distortion in ellipsoid-like nano-crystallites of copper.

The elastic state of embedded inclusions is of considerable importance to the properties of materials. The non-uniform lattice distortion in the inclusions in which the interfaces are shaped with variable curvature cannot be measured by usual experimental methods. In this paper, the lattice distortions in an ellipsoid-like nano-crystallite of copper were measured by means of the peak finding method in the central part of the HRTEM image.

A novel synthesis route of Ag2S nanotubes by sulfidizing silver nanowires in ambient atmosphere.

In this study, a 'two-step' strategy of synthesizing nanoparticles-assembled Ag,S nanotubes with a diameter of less than 100 nm is developed. At first, the silver nanowires with uniform length and diameter were synthesized by polyol reduction method using PVP as a capping agent. Then, the resulting silver nanowires were exposed to the ambient atmosphere of laboratory, gradually sulfidized by sulfur-containing molecules in air, and eventually transformed into nanoparticles-assembled Ag2S nanotubes.

Structural transition, electrical and magnetic properties of the B-site Co doped Sr(14)Cu(24)O(41) compounds.

The effect of Co substitution for Cu on the structure and physical properties of Sr(14)(Cu(1-x)Co(x))(24)O(41) compounds was studied by analyzing the selected-area electron diffraction and convergent-beam electron diffraction patterns, and by measuring the magnetic susceptibility, the electrical resistivity and Raman spectra. It is found that the space group of the CuO(2) chain is changed from Amma to Ammm upon Co doping, but the structure of the Cu(2)O(3) ladder remains unchanged. This indicates that the displacement between two neighboring CuO(2) chains has disappeared due to Co doping.

Charge density determination in icosahedral AlPdMn quasicrystal using quantitative convergent beam electron diffraction.

Charge density distribution in icosahedral AlPdMn quasicrystal has been studied on a single-crystal specimen by using quantitative convergent beam electron diffraction (QCBED) technique. The QCBED systematic row method was used in the refinement of structure factors. To refine the low-order structure factors, the wave-mechanical formulation of electron diffraction dynamical theory was used in the calculation of electron diffraction intensities for the quasicrystal in fitting the experimental intensity line scan profiles.

Elastic constants of Si crystal determined by thermal diffuse electron scattering.

The method of determining elastic constants of crystals by measuring thermal diffuse X-ray scattering around some Bragg reflections, is extended to measuring thermal diffuse electron scattering for the first time, in a transmission electron microscope, equipped with a field-emission gun, an [Formula: see text] -type energy filter and a multi-scan charge-coupled device. Quantitative diffuse electron scattering in the vicinity of the [Formula: see text] Bragg reflection was measured on a Si crystal in order to obtain information about elastic constants. Values of the elastic constants ratios C(12)/C(11)=0.