DEFORMATIONS OF ALUMINUM ALLOYS UNDER THE INFLUENCE OF AN ADDITIONAL LOAD

Under the influence of a constant magnetic processes in the future lead to destruction. Therefore, the authors investigated these processes in more detail. When studying the creep of the samples, a lever temperature) simultaneously with the application of the load (carried out by steps), an elongation of the sample was recorded with a micrometer (division price 10 load during the measurement, as well as smoo it is found that creeping increases under stable magnetic field; the main features appear at the first creep stage. Thus, preliminary exposure of samples in a constant magnetic field (with induc room temperature) leads to an increase in the absolute deformation of the aluminum alloy to 35%. The material deformation constants are also determined under " constant at the first stage of creep was found to be more than 6 times. Investigation of these processes will help to predict time dependence of creep strain and its rate as well as durability and plasticity at destruction.</jats:p

Inversion of Conductivity in p-Si after Ion Treatment

AbstractThe results of electric parameters studies of silicon samples with unusual p-n junctions are presented. The junctions appeared after the treatment of homogeneous p-Si wafers by 1–5 keV energy argon ion irradiation at the temperature below 100°C and without doping by any n-type impurities. The model of this phenomena is discussed.</jats:p

Ligand-forced dimerization of copper(I)–olefin complexes bearing a 1,3,4-thiadiazole core

As an important class of heterocyclic compounds, 1,3,4-thiadiazoles have a broad range of potential applications in medicine, agriculture and materials chemistry, and were found to be excellent precursors for the crystal engineering of organometallic materials. The coordinating behaviour of allyl derivatives of 1,3,4-thiadiazoles with respect to transition metal ions has been little studied. Five new crystalline copper(I) π-complexes have been obtained by means of an alternating current electrochemical technique and have been characterized by single-crystal X-ray diffraction and IR spectroscopy. The compounds are bis[μ-5-methyl-N-(prop-2-en-1-yl)-1,3,4-thiadiazol-2-amine]bis[nitratocopper(I)], [Cu2(NO3)2(C6H9N3S)2], (1), bis[μ-5-methyl-N-(prop-2-en-1-yl)-1,3,4-thiadiazol-2-amine]bis[(tetrafluoroborato)copper(I)], [Cu2(BF4)2(C6H9N3S)2], (2), μ-aqua-bis{μ-5-[(prop-2-en-1-yl)sulfanyl]-1,3,4-thiadiazol-2-amine}bis[nitratocopper(I)], [Cu2(NO3)2(C5H7N3S2)2(H2O)], (3), μ-aqua-(hexafluorosilicato)bis{μ-5-[(prop-2-en-1-yl)sulfanyl]-1,3,4-thiadiazol-2-amine}dicopper(I)–acetonitrile–water (2/1/4), [Cu2(SiF6)(C5H7N3S2)2(H2O)]·0.5CH3CN·2H2O, (4), and μ-benzenesulfonato-bis{μ-5-[(prop-2-en-1-yl)sulfanyl]-1,3,4-thiadiazol-2-amine}dicopper(I) benzenesulfonate–methanol–water (1/1/1), [Cu2(C6H5O3S)(C5H7N3S2)2](C6H5O3S)·CH3OH·H2O, (5). The structure of the ligand 5-methyl-N-(prop-2-en-1-yl)-1,3,4-thiadiazol-2-amine (Mepeta), C6H9N3S, was also structurally characterized. BothMepetaand 5-[(prop-2-en-1-yl)sulfanyl]-1,3,4-thiadiazol-2-amine (Pesta) (denotedL) reveal a strong tendency to form dimeric {Cu2L2}2+fragments, being attached to the metal atom in a chelating–bridging modeviatwo thiadiazole N atoms and an allylic C=C bond. Flexibility of the {Cu2(Pesta)2}2+unit allows the CuIatom site to be split into two positions with different metal-coordination environments, thus enabling the competitive participation of different molecules in bonding to the metal centre. ThePestaligand in (4) allows the CuIatom to vary between water O-atom and hexafluorosilicate F-atom coordination, resulting in the rare case of a direct CuI...FSiF52−interaction. Extensive three-dimensional hydrogen-bonding patterns are formed in the reported crystal structures. Complex (5) should be considered as the first known example of a CuI(C6H5SO3) coordination compound. To determine the hydrogen-bond interactions in the structures of (1) and (2), a Hirshfeld surface analysis has been performed.</jats:p