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51.
O. M. Zhigalina D. N. Khmelenin Yu. A. Valieva V. Yu. Kolosov A. O. Bokuniaeva G. B. Kuznetsov K. A. Vorotilov A. S. Sigov 《Crystallography Reports》2018,63(4):646-655
Lead zirconate titanate (PZT) films doped with lanthanum, Pb(1–х)Laх(Zr0.48Ti0.52) (х = 0, 0.02, 0.05, 0.08, or 0.01), have been investigated by electron microscopy and X-ray diffraction. Films were formed on Si–SiO2–TiO2–Pt substrates by chemical vapor deposition from a solution and annealed at temperatures T = 650 and 750°C. The main structural features of the films, differing them from undoped PZT films fabricated by the same method, have been established. It is found that doping with lanthanum delays the pyrochlore–perovskite transformation in the film bulk, i.e., in the regions distant from the film–substrate interface. The fraction of metastable pyrochlore phase increases with an increase in the La molar content in the films. The main reason for the delay is the deficit of lead in the intergranular perovskite space, especially in the upper part of the film. Annealing at T = 750°C reduces the content of pyrochlore phase but does not completely remove it, which was never observed for undoped PZT films. Doping with lanthanum leads to a change in the lattice period c and a tetragonal distortion of the perovskite lattice (c/a ratio). Hence, the [100] texture of the films obtained, in contrast to the typical [111] texture of PZT films, is due to the increase in the lattice mismatch between the film and platinum layer when lead atoms are replaced with lanthanum. Lattice distortions of “transrotational” character, whose value exceeds 160 deg/μm, are found to arise in growing crystals. 相似文献
52.
M. I. Pravdin A. V. Glushkov N. A. Djachkovski Yu. A. Egorov A. A. Ivanov V. A. Kolosov A. D. Krasilnikov S. P. Knurenko I. T. Makarov A. A. Mikhailov Z. E. Petrov V. P. Prokhorova A. V. Sabourov I. E. Sleptsov G. G. Struchkov 《Bulletin of the Russian Academy of Sciences: Physics》2009,73(5):541-543
The energy spectrum obtained on the Yakutsk array for the parameter S 600 is compared with the results obtained on the AGASA and HiRes arrays and the latest Pierre Auger Observatory data. The discrepancy in the intensity of the energy spectra obtained in different experiments can be explained by the presence of systematic errors in shower energy estimations. 相似文献
53.
M. I. Pravdin A. V. Glushkov A. A. Ivanov S. P. Knurenko V. A. Kolosov I. T. Makarov Z. E. Petrov A. V. Saburov I. E. Sleptsov G. G. Struchkov 《Bulletin of the Russian Academy of Sciences: Physics》2007,71(4):445-447
The main errors in energy estimation in individual events detected at the Yakutsk EAS array are analyzed. The data on the fraction of muons are considered. For inclined showers with energies exceeding 1019 eV, it is much larger than the value given by approximation at lower energies. This difference may be due to new processes arising upon interaction between particles with such energies, which leads to a significant increase in the muon component in the total primary-particle energy. 相似文献
54.
We present experimental results concerning the laser generation of picosecond acoustic pulses and their propagation in isotropic and anisotropic materials. We make use of a conventional reflectance detection technique as well as interferometric detection to probe the real and imaginary changes in reflectance. We also demonstrate the detection of transverse acoustic waves by mode conversion at an interface between an isotropic polycrystalline film and an anisotropic substrate. 相似文献
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Olivomycin and related antibiotics XXVI. The absolute configurations of olivin and of chromomycinone
Summary The stereochemical correlation of olivin with chromomycinone and the directed degradation of the first of them to di-O-methyl-D-tartaric acid (XXI) has been effected. As a result, it has been shown that olivin and chromomycinone both have the absolute configuration 2S,3R,1S,3S,4R and possess the respective structures (Ia) and (Ib).For Communication XXV, see [1], and for a preliminary communication see [2].M. M. Shemyakin Institute of the Chemistry of Natural Compounds, Academy of Sciences of the USSR. Translated from Khimiya Prirodnykh Soedinenii, No. 4, pp. 526–534, July–August, 1972. 相似文献
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