[en] Deuteron reactions have been studied for the possibility of producing ²⁰¹Tl so that this radioisotope could be made as an adjunct to neutron therapy. The cross-sections for the (d,xn) reactions for ²⁰³Tl and ²⁰⁵Tl target nuclei have been measured for x=3, 4, and 5. From these data the yields of ²⁰¹Tl for a typical treatment day have been calculated

[en] Optical properties of three types of insulating films that show promise in potential applications in the III-V semiconductor technology were evaluated, namely a-C:H, BN and CaF₂. The plasma deposited a-C:H shows an amorphous behavior with optical energy gaps of approximately 2 to 2.4 eV. These a-C:H films have higher density and/or hardness, higher refractive index and lower optical energy gaps with increasing energy of the particles in the plasma, while the density of states remains unchanged. These results are in agreement, and give a fine-tuned positive confirmation to an existing conjecture on the nature of a-C:H films. Ion beam deposited BN films show amorphous behavior with energy gap of 5 eV. These films are nonstoichiometric (B/N approximately 2) and have refractive index, density and/or hardness which are dependent on the deposition conditions. The epitaxially grown CaF₂ on GaAs films have optical parameters equal to bulk, but the authors found evidence of damage in the GaAs at the interface

[en] A theoretical analysis has been carried out to investigate the kinetics involved in the CVD growth of CuInS₂. A stagnant-layer model is assumed for the numerical simulation. Computational results for the growth rate as a function of the substrate temperature, mean gas velocity and partial pressures in the reaction tube are obtained. This analysis indicates that the substrate temperature plays a dominant role in the growth rate, which is consistent with our experimental data

[en] Bulk samples of V₃Si were homogeneously irradiated by 35-MeV protons. Superconducting critical temperatures T/sub c/, residual resistivities rho₀, and upper critical fields H/sub c/2 were measured for magnetic fields up to 14 T and temperatures from 1.4 K up to T/sub c/. The observed temperature dependence of H/sub c/2 is consistent with strong paramagnetic limiting and small spin-orbit scattering. Based on all collected data, estimates are provided for the electron-phonon coupling parameter lambda and the band density of states N(0). These estimates suggest that for radiation-damaged V₃Si a general relation of the form lambda = AN(0)-BN(0)² exists, where A and B are positive constants

No abstract available

[en] The TbFe_6-xGa_6+x compounds (x=0, 0.5, 1.0 and 1.45) have been prepared and studied by X-ray powder diffraction and magnetization measurements. The structure of the compound TbFe_6-xGa_6+x transfers from the orthorhombic ScFe₆Ga₆-type structure (space group Immm) (x=0 and 0.5) to the tetragonal ThMn₁₂-type structure (space group I4/mmm) (x=1.0 and 1.5) and the volume of the unit cell increases as Ga content increases. The lattice parameters are a=0.85551, b=0.8626 and c=0.50717 nm for TbFe₆Ga₆, and a=0.86938 and c=0.50918 nm for TbFe_4.55Ga_7.45. The magnetization measurements indicate all the TbFe_6-xGa_6+x compounds have magnetic ordering. The Curie temperatures decrease from 492 K for TbFe₆Ga₆ to 327 K for TbFe_4.55Ga_7.45. The magnetization of the TbFe_6-xGa_6+x decreases with temperature decreases below its magnetic ordering temperature due to the increasing Tb-sublattice magnetization which is antiparallel to the Fe-sublattice magnetization.

[en] Ni_0.35Zn_0.65Fe₂O₄ ferrite is prepared through combustion synthesis in the external electromagnetic field. The highest magnetic field strength for the experiment is 1.1 T. Reactions temperatures were monitored by infrared radiation thermometer, the synthesized ferrite prepared in different magnetic fields is analyzed by XRD, SEM, and VSM. The results indicate that the coercivity of ferrite gradually decrease with the increase of magnetization. When the magnetic field strength is 0.54 T, the saturation magnetization is improved up to 56.05 emu/g (42%) as compared to that of ferrite in zero magnetic field. Through SEM analysis of Ni_0.35Zn_0.65Fe₂O₄ ferrite, homogeneous grains of the crystal are observed. With the increase of external magnetic field, the ferrite grain improved. This paper also systematically explores the effect of the electromagnetic field on ferrite by combustion synthesis.

[en] In this paper, many rules about N₂O and NO_x emission under fluidized bed combustion conditions were found by experiments. The research results indicate that CaO, CaSO₄, Fe₂O₃ and char have important influence on decomposition of N₂O; co-combustion of coal and biomass are effective measures to low N₂O and NO_x emission

[en] The isothermal section (500 deg. C) of the phase diagram of the Gd-Fe-Ga ternary system was investigated by X-ray powder diffraction analysis. Eleven binary compounds, GdGa₂, GdGa, Gd₃Ga₂, Gd₅Ga₃, GdFe₂, GdFe₃, Gd₂Fe₁₇, Fe₃Ga, Fe₆Ga₅, Fe₃Ga₄ and FeGa₃, have been confirmed. Two ternary compounds, GdFe_5.3Ga_6.7 and GdFe₅Ga₇, were found in this ternary system at 500 deg. C. The compound GdFe_5.3Ga_6.7 is orthorhombic ScFe₆Ga₆-type structure (space group Immm) with a = 0.8567 (9), b = 0.86960 (9) and c = 0.50782 (5) nm, while the compound GdFe₅Ga₇ is tetragonal ThMn₁₂-type structure (space group I4/mmm) with a = 0.8651(1) and c = 0.50934 (6) nm. The isothermal section at 500 deg. C consists of 16 single-phase regions, 31 two-phase regions and 16 three-phase regions. The maximum solid solubilities of Ga in GdFe₂, GdFe₃, Gd₂Fe₁₇ are 9.2, 9.0, and 44.3 at.% respectively. The homogeneity range of GdGa₂ is from 22 to 33.3 at.% Ga in Gd-Ga side but the solid solubility of Fe in this compound is very small. The homogeneity range of GdFe₅Ga₇ is from 53.8 to 59.2 at.% Ga. Very limited solid solutions were measured in the other compounds.