[en] The particle tracking autoradiography(PTA) is a very useful method to investigate the boron distribution through the large sample area. The PTA method for boron uses the phenomenon that boron irradiated by neutron emits Li-ion and alpha particle; boron distribution can be obtained by observing the traces of the emitted particles. At HANARO in KAERI, a study for observing the boron distribution has been performed for several years. Recently, the experimental techniques were improved to provide reliable images for samples of various composition. In this report, the PTA method and experimental techniques were described in detail and the experimental results of the sample polishing, the amount of neutron irradiation and the etching time were reported. As a result, the optimum conditions for the analysis of boron distribution with respect to the amount of added boron were appeared

[en] A novel technique is disclosed for radiation hardening of MOS devices and specifically for stabilizing the gate threshold potential at room temperature of a radiation subjected MOS field-effect device of the type having a semiconductor substrate, an insulating layer of oxide on the substrate, and a gate electrode disposed on the insulating layer. In the preferred embodiment, the novel inventive technique contemplates the introduction of boron into the insulating oxide, the boron being introduced within a layer of the oxide of about 100A to 300A thickness immediately adjacent the semiconductor-insulator interface. The concentration of boron in the oxide layer is preferably maintained on the order of 10 atoms/ cm³. The novel technique serves to reduce and substantially annihilate radiation induced positive gate charge accumulations, which accumulations, if not eliminated, would cause shifting of the gate threshold potential of a radiation subjected MOS device, and thus render the device unstable and/or inoperative. (auth)

[en] One of the important challenges to the semiconductor industry today is to enhance the solid solubility of several dopants, boron in particular, in silicon. We calculate the equilibrium solid solubility of boron in Si from first principles and examine the effect of biaxial stress. We find an unexpectedly large enhancement, on the order of 150 percent, for only 1 percent strain primarily due to the charge of the substitutional boron impurity in Si. We point out that this effect is an intrinsic property of Si and is expected to be important for other dopants as well

[en] Boron-containing steels with content of carbon from 0.08 up to 0.60 mass.% and boron from 0.003 up to 0.018 mass.% are investigated by X-ray diffraction method. Fe₂B boride phase crystals precipitate on the austenite grain boundaries at low-speed cooling of Fe-B-C system low-carbon alloys. Boride+borocementite two-phase inclusions are observed along with boride at the increase of carbon content over 0.15 mass.%, while at carbon content over 0.40 mass.% - only borocementite is observed. Borocementite forms broken grid along the austenite grain boundaries and is found as compact inclusions inside the grains as well. Within alloys of Fe-B-C system along with standard pearlite there occur the parts of more coarse, non-etching at thermal etching pearlite, where boron atoms are substituted for negligible part of carbon atoms

No abstract available

[en] A method for direct estimation of boron in a sample was suggested. The work was performed with standards selected from among commercial samples. An arc-type generator was used for spectrum exciation. Pure aluminium or copper cores (dia 6 mm) were recessed to form truncated cones, pad dia 1 mm. The spectra were photographed on a spectrograph. Analytical line pair: B 249.6 - Fe 249.8 nm. Boron contents estimated: (<=) 0.001 %. Duration of analysis: 20 min

[en] Influence of small boron additions on hardenability of iron-graphite powder steels was investigated. It is shown that boron addition in amounts of more than 0.045% leads to decrease of impact strength and ductility. Boron addition in amount of 0.03-0.04% enables to decrease quenching temperature and to obtain higher hardness of quenched material

[en] The Particle Tracking Autoradiography(PTA) technique based on the 10B(n, α)7Li fission reaction with a solid detector(LR115 film) has become a powerful tool for studying the behavior of boron distribution in materials. In this study, it is investigated in changing the method that the film on the specimen attach, the etching time to film and the surface roughness of the specimens

No abstract available

[en] Boron (B) deficiencies occur over a wider range of soils and crops in the world. Different sources of fertilizers are used to supply sufficient amounts of B for healthier plant growth. The effectiveness of crushed ore colemanite as B source for rice crop under flooded calcareous soil was evaluated in a glass house study. We studied the effects of powder colemanite (PC) and granular colemanite (GC) at the rates of 0, 1, 2, and 3 kg B ha-1 on growth and yield parameters of rice crop. Powder colemanite application at 2 and 3 kg B ha-1 significantly increased plant height, number of tillers and panicles plant-1, number of grains panicle-1, weight of 1000 grains and B concentration in grain compared to those observed due to application of 0 and 1 kg B ha-1. Rice crop applied B at 3 kg ha-1 in the form of PC produced significantly (18% increase over control) higher grain yield than 0 kg B ha-1 treatment. The effectiveness of PC was higher in terms of yield and yield parameters of rice than the GC, The B source of PC was very effective in supplying B to rice crop, however GC applied pots produced significantly lower yields because of its larger particle size which was the controlling factor in B release from the fertilizer. (author)