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1.
Инвентарный номер: нет.
   
   B 22


    Bannikov, V. V.
    Isotropic and Anisotropic Exchange Interactions in the Orbitally Degenerate Excited (4A2x2T2) State of a Cr3+ Ion Pair Possessing D3h Symmetry / V. V. Bannikov, B. V. Mitrofanov // Physics of the Solid State. - 2002. - Vol. 44, № 8. - P1550-1552 : il. - Bibliogr. : p. 1552 (4 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ИОНЫ ХРОМА -- ХРОМ -- АНИЗОТРОПИЯ
Аннотация: Experimentally observed optical absorption spectra of isolated pairs of chromium ions in Cs3Cr2Br9 corresponding to transitions of pairs from the ground (4A2x 2A2) state to a singly excited (4A2 xT2) state are theoretically interpreted. It is shown that the position of the exchange multiplets in the excited (4A2 x2T2) state is determined mainly by the resonance exchange interactions removing the degeneracy with respect to the exchange by an excitation within the pair. It is established that the observed fine structure of the pair in the (4A2 x2T2) state is due to a superposition of the contributions from the one- and two-center spin–orbit interaction and resonance antisymmetric exchange

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2.
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   B 22


    Bannikov, V. V.
    Double Exchange in Cubic Crystals with Pairs of Exchange-Coupled Mixed-Valence 3d3 –3d4 Ions / V. V. Bannikov, V. Ya. Mitrofanov // Physics of the Solid State. - 2005. - Vol. 47, № 8. - P1532-1534 : il. - Bibliogr. : p. 1534 (6 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
НЕСТЕХИОМЕТРИЯ -- 3-D ИОНЫ -- KZnF3
Аннотация: Specifics of the exchange interaction in mixed-valence Cr2+–Cr3+ 3d-ion pairs in KZnF3 crystals are studied. It is shown that the double-exchange interaction can be significantly reduced by the low-symmetry crystal field created by a compensator. The features of the exchange interaction and optical absorption spectra are qualitatively analyzed

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3.
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   O-66


   
    Optical and Magneto-Optical Properties of Nanostructured Yttrium Iron Garnet / B. A. Gizhevsky, Yu. P. Sukhorukov, E. A. Gan’shina, N. N. Loshkareva, A. V. Telegin, N. I. Lobachevskaya, V. S. Gaviko, V. P. Pilyugin // Physics of the Solid State. - 2009. - Vol. 51, № 9. - P1836-1842 : il. - Bibliogr. : p. 1841-1842 (21 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ГАРНЕТЫ -- ИТТРИЙ -- ЖЕЛЕЗО -- МАГНЕТООПТИЧЕСКИЕ СВОЙСТВА
Аннотация: Bulk dense samples of nanostructured yttrium iron garnet Y3Fe5O12 with crystallite sizes of 20–40 nm are prepared by high pressure torsion from a garnet powder with micron grains. The absorption and Faraday rotation spectra in the IR range and the transverse Kerr effect spectra in the visible spectral range for these samples are measured. The absorption and magneto optical effect spectra are in agreement with the corresponding spectra of single crystals. The appearance of additional absorption bands at 2 and 3 μm is associated with the violation of the stoichiometry of the nanogarnet and the possible contamination of the initial material. The specific Faraday rotation in the transparency window is approximately 1.5 times smaller than the corresponding quantity for single crystals. The extrema in the Kerr effect spectra coincide with those for single crystals, are smaller in magnitude, and are smeared. On the whole, the prepared bulk samples are transparent in the IR spectral range and exhibit optical and magneto optical characteristics comparable to the corresponding parameters for single crystals. The high density of point defects of the nanogarnet is primarily due to the violation of the stoichiometry and the valence state of iron ions

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4.
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   A 29


    Akashev, L. A.
    The Optical Properties of Al–8 at.% Ce Alloy in the Liquid, Amorphous, and Crystalline States / L. A. Akashev, V. E. Sidorov // High Temperature (Translation of Teplofizika Vysokikh Temperatur). - 2009. - Vol. 47, № 3. - P. 331-335 : il. - Bibliogr. : p. 335 (6 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
СВОЙСТВА ОПТИЧЕСКИЕ -- ЦЕРИЙ -- СПЛАВЫ ЖИДКИЕ -- СПЛАВЫ КРИСТАЛЛИЧЕСКИЕ -- СПЛАВЫ АМОРФНЫЕ
Аннотация: The method of spectral ellipsometry is used in the spectral range of 0.52–2.7 eV for measuring the optical constants of liquid, amorphous, and polycrystalline alloys of Al–8 at.% Ce. The results are used to calculate the dispersion dependences of light conduction, of reflectivity, and of functions of characteristic loss of electron energy of these alloys. It is found that the band-to-band transitions have a significant effect on the optical properties of alloy in the amorphous and polycrystalline states. Two absorption bands are observed in the spectra of light conduction of these alloys, namely, in the amorphous alloy at photon energy of 1.72 eV and 0.69 eV, and in the polycrystalline alloy at 1.55 eV and 1.03 eV. The reflectance spectra of liquid and amorphous alloys almost coincide, which is due to the similarity of their atomic structures

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5.
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   G 15


    Galakhov, V. R.
    Electronic structure of defective lithium cobaltites LixCoO2 / V. R. Galakhov, M. Neumann, D. G. Kellerman // Applied Physics A. - 2009. - Vol. 94. - P.497-500 : il. - Bibliogr. : p. 500 (18 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
КОБАЛЬТИТ ЛИТИЯ -- СТРУКТУРА ЭЛЕКТРОННАЯ -- РЕНТГЕНОВСКИЕ ЭМИССИОННЫЕ СПЕКТРЫ
Аннотация: X-ray absorption, resonant X-ray emission, and??X-ray photoelectron spectroscopical methods have been applied for the study of the electronic structure of defective lithium cobaltites LixCoO2 (0.6 . x . 1.0). Resonant O K alfa X-ray emission spectra of LiCoO2 showed localized excitonic??states due to a dd transition between occupied and??unoccupied Co 3d states. On the base of measurements of Co 3s X-ray photoelectron, Co 2p, and O 1s X-ray absorption spectra, it was established that in defective cobaltites??the electronic holes are localized mainly in O 2p states. An evidence of phase separation in LixCoO2 has been found. It was shown that the semiconductor-to-metal transition in LixCoO2 (x <0.76) at about 160 K is not accompanied by??changes in the Co 3d electronic configuration which remains 3d6

\\\\Expert2\\nbo\\Applied Physics A Materials Science and Processing\\2009, v. 94, N 3, p. 497-500.pdf
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6.
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   V 18


   
    Valence States of 3d Ions in Lanthanum Manganites–Cobaltites, Determined by X-Ray Spectroscopy / V. R. Galakhov, M. A. Melkozerova, T. I. Chupakhina, G. V. Bazuev, M. Raekers, M. Neumann, S. L. Molodtsov // Bulletin of the Russian Academy of Sciences: Physics. - 2008. - Vol. 72, № 10. - P. 1403-1405 : il. - Bibliogr. : p. 1405 (12 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
МАНГАНИТЫ -- КОБАЛЬТИТЫ -- ЛАНТАН
Аннотация: The valence states of manganese and cobalt ions in lanthanum manganites–cobaltites La1−xCaxMn0.5Co0.5O3 have been determined by 2p X-ray absorption and 3s X-ray photoelectron spectroscopies. The nanostructured P1 manganite–cobaltite phase with the concentration x= 0, obtained by the citrate method at a temperature of 700°C, is characterized by a valence state of cobalt ions close to 2+ and a valence state of Mn ions of about 3.5+. The P2 phase at the same calcium concentration, synthesized by the high-temperature solid-phase method at a temperature of 1300°C , is characterized by a manganese valence of 3.5+ and a cobalt valence of about 2.3+. An increase in the dopant concentration leads to an increase in the average valence of 3d ions

\\\\Expert2\\nbo\\Bulletin of the Russian Academy of Sciences Physics\\2008, V. 72, N 10, P.1403-1405.pdf
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7.
Инвентарный номер: нет.
   
   A 29


    Akashev, L. A.
    Optical Properties of Liquid Aluminum and Al–Ce Alloy / L. A. Akashev, V. I. Kononenko // High Temperature (Translation of Teplofizika Vysokikh Temperatur). - 2001. - Vol. 39, № 3. - P. 384-387 : il. - Bibliogr. : p. 387 (14 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
СВОЙСТВА ОПТИЧЕСКИЕ -- АЛЮМИНИЙ ЖИДКИЙ -- СПЛАВЫ -- ЦЕРИЙ
Аннотация: The Beattie ellipsometric method is used to investigate the index of refraction and the absorption coefficient of liquid aluminum and Al–3 at. % Ce alloy in the wavelength range from 0.44 to 2.3 mm at a temperature of 1173 K. The experimental results are used to calculate the dispersion dependences of light conductance, reflectivity, and functions of characteristic loss of electron energy. The results of measurements in the infrared (IR) spectrum are used to determine the concentration of conduction electrons, plasma frequency, relaxation frequency, and the limiting light conductance. It turns out that an addition of 3 at. % Ce to aluminum causes almost no change in the concentration of charge carriers, whereas the relaxation frequency increases, which leads to a decrease in the electrical conductivity of the liquid alloy

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8.
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   S 98


   
    Synthesis, Crystal and Electronic Structures, and Thermodynamic Characteristics of BaCe1 – xInxO3 – x/2 Solid Solutions / T. I. Chupakhina, N. I. Matskevich, G. V. Bazuev, N. A. Ovechkina, V. R. Galakhov, M. Raeckers, M. Neumann // Russian Journal of Inorganic Chemistry. - 2010. - Vol. 55, № 7. - P1002-1009 : il. - Bibliogr. : p. 1008-1009 (37 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ПЕРОВСКИТЫ -- ТВЕРДЫЕ РАСТВОРЫ -- ОКСИД ЦЕРИЯ
Аннотация: New perovskite oxide phases BaCe1 – xInxO3 – x/2 (x = 0.1–0.8) (space group Pbnm) have been synthesized. The unit cell volume of the resulting solid solutions monotonically decreases with an increase in the degree of substitution of indium for cerium due to the contraction of octahedra in perovskite blocks. The thermodynamic stability of the compound BaCe0.75In0.25O2.875 was studied by the solution calorimetry method, and barium cerates were shown to be thermodynamically stable with respect to binary oxides at room temperature. The structure of occupied and vacant states in BaCe1 – xInxO3 – x/2 was determined on the basis of X ray emission, absorption, and photoelectron spectra, and the energy gap was estimated at ~2 eV

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9.
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   A 29


    Akashev, L. A.
    Optical properties of liquid gallium–indium alloy / L. A. Akashev, V. I. Kononenko // Technical Physics. - 1998. - Vol. 43, № 7. - P853-854 : il. - Bibliogr. : p. 854 (8 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ОПТИЧЕСКИЕ СВОЙСТВА -- СПЛАВЫ -- ГАЛЛИЙ-ИНДИЙ
Аннотация: Beatte ellipsometry is used to study the refractive index and absorption coefficient of liquid gallium and of a gallium–30 at. % indium alloy for wavelengths of 0.4–2.0 mm at a temperature at 373 K. The dispersion rel curves of the photoconductivity and reflectivity are calculated from the experimental data. The measured data in the infrared are used to calculate the concentration of conduction electrons and the relaxation rate. It is found that when 30 at. % of indium is introduced into gallium, the concentration of charge carriers does not change, while the relaxation rate of the conduction electrons changes substantially, and this leads to a decrease in the electrical conductivity of the liquid alloy

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10.
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   F 42


   
    Ferromagnetic Resonance and Antiresonance in Lanthanum–Yttrium Manganite Powder / A. B. Rinkevich, A. P. Nossov, V. G. Vasil'ev, E. V. Vladimirova // Technical Physics. - 2004. - Vol. 49, № 6. - P751-757 : il. - Bibliogr. : p. 757 (25 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ФЕРРОМАГНИТНЫЙ РЕЗОНАНС -- ФЕРРОМАГНИТНЫЙ АНТИРЕЗОНАНС -- ЛАНТАН-ИТТРИЕВЫЕ МАНГАНИТЫ -- ПОРОШКИ
Аннотация: Absorption of centimeter waves in La0.6Y0.07Ba0.33MnO3 manganite powder is studied under the conditions of ferromagnetic resonance and antiresonance. It is found that interaction between different components of the microwave fields and the manganite distorts the shape of resonance lines and changes the resonance-to-antiresonance amplitude ratio. In the range of ferromagnetic resonance fields, great (up to 25 times) changes in the transmitted microwave power are observed

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11.
Инвентарный номер: нет.
   
   E 91


   
    Europium Valence State in Europium Monoxide–Iron (Cobalt) Magnetic Composites / N. I. Ignat'eva, A. S. Shkvarin, V. I. Osotov, L. D. Finkel’shtein // Russian Journal of Inorganic Chemistry. - 2009. - Vol. 54, № 10. - P1517-1521 : il. - Bibliogr. : p. 1520-1521 (8 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ОКСИД ЕВРОПИЯ -- ПОРОШКИ -- КОБАЛЬТ -- ЖЕЛЕЗО
Аннотация: Composite magnetic powders EuO/Fe(Co) were synthesized. These composites are candidates for use as materials for spintronics devices operating at room temperature. The composites synthesized by carbothermal reduction of oxide mixtures Eu2O3 and Fe2O3(or Co3O4) contain not only europium in the main valence state (2+) but also europium in the state 3+, its content increasing with the content of the d metal and depending on technological parameters of the reduction process. The content of the trivalent europium in the composites was estimated by chemical analysis and L111-edge X-ray absorption spectroscopy (XAS). The results obtained by these methods correlate with each other. XAS is considered to be a quantitative express method of certification of materials containing europium in various valence states

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12.
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   E 43


   
    Electronic Structure and the Optical and Photocatalytic Properties of Anatase Doped with Vanadium and Carbon / V. M. Zainullina, V. P. Zhukov, V. N. Krasil'nikov, M. Yu. Yanchenko, L. Yu. Buldakova, E. V. Polyakov // Physics of the Solid State. - 2010. - vol. 52, № 2. - P271-280 : il. - Bibliogr. : p. 279-280 (45 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
АНАТАЗ -- ВАНАДИЙ -- КАРБОН -- ФОТОКАТАЛИТИЧЕСКИЕ СВОЙСТВА -- ЭЛЕКТРОННАЯ СТРУКТУРА
Аннотация: The electronic structures of undoped anatase and anatase doped with carbon and vanadium have been calculated using the ab initio tight binding linear muffin tin orbital (TB-LMTO) method in the LSDA + U approximation. It has been shown that the doping of TiO2 leads to the formation of narrow bands of the C and V impurity states in the band gap. The calculations of the imaginary part of the dielectric function have made it possible to estimate the intensity of the optical absorption. It has been established that the doping with vanadium and carbon leads to optical absorption in the visible range and to an increase in the absorption in the ultraviolet range up to 4 eV. This should result in an increase in the photocatalytic activity on the surface of the doped anatase. The experimental determination of the photocatalytic activity of whiskers of the anatase doped with carbon and vanadium in the reaction of hydroquinone oxidation has confirmed the increase in the activity of the doped materials under exposure to ultraviolet, visible, and blue light. The phenomenon of dark catalysis in the anatase doped with carbon and vanadium has been interpreted within the concept of low-energy electronic excitations between the impurity levels of carbon

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13.
Инвентарный номер: нет.
   
   O-66


   
    Optical Absorption and Nuclear Magnetic Resonance in Lithium Titanium Spinel Doped by Chromium / D. G. Kellerman, N. A. Mukhina, N. A. Zhuravlev, M. S. Valova, V. S. Gorshkov // Physics of the Solid State. - 2010. - Vol. 52, № 3. - P459-464 : il. - Bibliogr. : p. 463-464 (34 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ОПТИЧЕСКАЯ АБСОРБЦИЯ -- ЯМР -- ЯДЕРНЫЙ МАГНИТНЫЙ РЕЗОНАНС -- ТИТАНАТ ЛИТИЯ -- ШПИНЕЛИ -- ДОПИРОВАНИЕ -- ХРОМ
Аннотация: The optical absorption and nuclear magnetic resonance spectra of Li4 – xCr3xTi5 – 2xO12 (x = 0, 0.01, 0.02, 0.04) solid solutions have been investigated. It has been found that, in the Li4Ti5O12 spinel, lithium ions migrate from tetrahedral to octahedral positions with increasing temperature. Doping of chromium to the spinel favors an increase in the fraction of tetrahedrally coordinated lithium and hinders diffusion

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14.
Инвентарный номер: нет.
   
   A 10


   
    A Study of the Cerium Valence in Multinary Garnet Compounds / N. N. Efremova, N. I. Lobachevskaya, V. I. Nefedov, L. D. Finkel’shtein, V. G. Bamburov // Russian Journal of Inorganic Chemistry. - 2006. - Vol. 51, № 2. - P277-280 : il. - Bibliogr. : p. 280 (6 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ЦЕРИЙ -- ГРАНАТЫ МНОГОКОМПОНЕНТНЫЕ
Аннотация: The valence state of cerium ions in the ferrite garnets {Gd1.96BiCe0.04}Ga1.2Fe3.8O12,{GdBiCe 0.5Ca0.5}Ga1.2Fe3.8O12, and {GdBiCe0.25Ca0.25}Ga1.2Fe.8O12 was studied by L3 X-ray absorption spectroscopy. Information on the change in the chemical bonding in ferrite garnets upon the violation of lattice completeness was obtained from the shifts of absorption maxima

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15.
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   S 53


    Shein, I. R.
    Thorium compounds with non-metals: electronic structure, chemical bond, and physicochemical properties [Text] / I. R. Shein, A. L. Ivanovskii // Journal of Structural Chemistry. - 2008. - Vol. 49, № 2. - P348-370. - Библиогр. : с. 367 (113 назв.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ТОРИЙСОДЕРЖАЩИЕ СИСТЕМЫ -- ЭЛЕКТРОННАЯ СТРУКТУРА -- НЕМЕТАЛЛЫ
Аннотация: The current state of research on the nature of the chemical bond and the physicochemical properties of binary ThX (X = H, B, C, N, O, P, S, As, Se, Sb) and ternary (carbonitrides, thorates, and silicates) thorium compounds by modern ab initio methods of the band structure theory is reviewed. The possibilities of the ab initio band structure methods in describing the structural states, phase stability, elasticity characteristics, X-ray emission, absorption, and photoelectron spectra of thorium-containing systems are discussed

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16.
Инвентарный номер: нет.
   
   U 43


   
    Ultrasound velocity and absorption in BeO, Al2O3, ZrO2, and SiO2 ceramics [Text] / V. S. Kiiko, Yu. I. Komolikov, Yu. N. Makurin, I. R. Shein, A. L. Ivanovskii // Inorganic Materials. - 2007. - Vol. 43, № 12. - P1361-1364. - Библиогр. : с. 1364 (12 назв.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
КЕРАМИКА ОКСИДНАЯ -- БЕРИЛЛИЙ -- АЛЮМИНИЙ -- ЦИРКОНИЙ -- КРЕМНИЙ
Аннотация: We have measured the ultrasound velocity and absorption in BeO, Al2O3, ZrO2, and SiO2 ceramics.The results indicate that the ultrasound velocity in oxide ceramics depends on the nature of the basic oxide component, the density of the material, and the preferential alignment of the grains. The ultrasound velocity in ceramics is shown to correlate with their thermal conductivity: with increasing thermal conductivity, the ultrasound velocity increases. The ultrasound absorption in oxide ceramics ecreases with decreasing temperature,and vice versa, with increasing temperature, the ultrasound attenuation coefficient increases

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17.
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   V 36


   
    Velocity and absorption of ultrasound in beryllium oxide ceramic [Текст] / V. S. Kiiko, I. R. Shein, M. A. Gorbunova, Yu. N. Makurin, A. L. Ivanovskii // Glass and Ceramics. - 2006. - Vol. 63, № 11-12. - С. 425-430. - Библиогр. : с. 429 (13 назв.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ОКСИД БЕРИЛЛИЯ -- КЕРАМИКА -- КЕРАМИЧЕСКИЕ МАТЕРИАЛЫ
Аннотация: The ultrasound wave propagation velocity and absorption of ultrasound in samples of beryllium ceramics of varying density, shape, and size that differed by the molding method and degree of texturing of BeO microcrystals were investigated at room and low temperatures (approximately 100 K). It was found that the ultrasound propagation velocity increases with an increase in the density of the samples. It was shown that the ultrasound velocity in beryllium ceramics without specially added dopants is weakly dependent on the frequency in the 5 – 25 MHz range

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18.
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   S 46


   
    Semiconductor-metal transition in defect lithium cobaltite [Текст] / D. G. Kellerman, V. R. Galakhov, A. S. Semenova, Ya. N. Blinovskov, O. N. Leonidova // Physics of the Solid State. - 2006. - Vol. 48, № 3. - С. 548-556. - Библиогр. : с. 555 (36 назв.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ПЕРЕХОД ПОЛУПРОВОДНИК - МЕТАЛЛ -- КОБАЛЬТИТ ЛИТИЯ
Аннотация: The magnetic susceptibility, electrical conductivity, and x-ray photoelectron and x-ray absorption spectra of defect lithium cobaltites of the general formula Li1−xCoO2 are investigated. It is found that, for lithium cobaltites with x> 0.25, the magnetic susceptibility increases abruptly and the conductivity type changes at T~ 150 K. The assumption is made that the semiconductor–metal transition in defect lithium cobaltite is caused by the increase in the diffusion mobility of lithium ions with an increase in the temperature when there is a correlation between spatial distributions of lithium vacancies and “electron” holes

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19.
Инвентарный номер: нет.
   
   M 65


   
    Microwave absorption in lanthanum manganite [] / A. Rinkevich, A. Nossov, V. V. Ustinov, V. Vassiliev // Conference on Advanced Magneto-Resistive Materials (March 4-7, 2001): Abstr. - 2001. - С. 2-33
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
МИКРОВОЛНОВАЯ АБСОРБЦИЯ -- АБСОРБЦИЯ МИКРОВОЛНОВАЯ -- ЛАНТАН -- La -- МАНГАНИТЫ -- ФЕРРОМАГНЕТИКИ -- МАГНИТОСОПРОТИВЛЕНИЕ -- ПОЛИКРИСТАЛЛИЧЕСКИЕ МАНГАНИТЫ -- МАНГАНИТЫ ПОЛИКРИСТАЛЛИЧЕСКИЕ -- МАГНИТНЫЕ ПОЛЯ -- ПОЛЯ МАГНИТНЫЕ -- ФЕРРОМАГНИТНЫЙ РЕЗОНАНС -- РЕЗОНАНС ФЕРРОМАГНИТНЫЙ -- ФЕРРОМАГНИТНЫЙ АНТИРЕЗОНАНС -- АНТИРЕЗОНАНС ФЕРРОМАГНИТНЫЙ

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20.
Инвентарный номер: нет.
   
   С 44


   
    Скорость и поглощение ультразвука в оксидной бериллиевой керамике [Текст] = Ultrasonic speed and absorption in oxide beryllium ceramics / В. С. Кийко, И. Р. Шеин, М. А. Горбунова, Ю. Н. Макурин, А. Л. Ивановский // Стекло и керамика. - 2006. - № 12. - С. 29-33 : рис. табл. - Библиогр.: с. 33 (13 назв.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ОКСИДНАЯ БЕРИЛЛИЕВАЯ КЕРАМИКА -- СКОРОСТЬ УЛЬТРАЗВУКА -- ПОГЛОЩЕНИЕ УЛЬТРАЗВУКА -- УЛЬТРАЗВУК -- КЕРАМИКА
Аннотация: Исследованы при комнатной и пониженной температурах (примерно 100 К) скорость распространения ультразвуковых волн и поглощение ультразвука в образцах бериллиевой керамики различной плотности, конфигурации и размеров, различающихся методом формования и степенью текстурирования микрокристаллов BeO. Установлено, что с повышением плотности образцов возрастает скорость распространения ультразвука в них. Показано, что скорость ультразвука в бериллиевой керамике без специально введенных примесей слабо зависит от частоты в диапазоне 5-25 МГц

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