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1.


    Golovnev, N. N.
    Crystal structure of potassium 2-thiobarbiturate / N. N. Golovnev, M. S. Molokeev, M. Y. Belash // J. Struct. Chem. - 2013. - Vol. 54, Is. 3. - P. 566-570, DOI 10.1134/S0022476613030141. - Cited References: 18. - The work was supported by the grant of the President of the Russian Federation for the support of leading scientific schools of the Russian Federation (NSh-4828.2012.2) and the Federal Targeted Program "Scientific and Scientific Pedagogical Personnel of Innovative Russia, 2009-2013" (State contracts Nos. 02.740.11.0269 and 02.740.11.0629). . - ISSN 0022-4766
РУБ Chemistry, Inorganic & Nuclear + Chemistry, Physical
Рубрики:
ACID
Кл.слова (ненормированные):
crystal structure -- potassium thiobarbiturate -- hydrogen bonds -- pi-pi interaction
Аннотация: The crystal and molecular structure of potassium thiobarbiturate C4H3KN2O2S (C4H4N2O2S-2-thiobarbituric acid, H(2)TBA) is determined. Crystallographic data for KHTBA are as follows: a = 11.2317(17) , b = 3.8687(6) , c = 14.557(2) , beta = 97.448(4)A degrees, V = 627.18(17) (3), space group P2/c, Z = 4. Each potassium ion is linked with four oxygen atoms and two S atoms forming a distorted octahedron. N-HaEuro broken vertical bar O and C-HaEuro broken vertical bar S hydrogen bonds form a branched three-dimensional network. The structure is also stabilized by the pi-pi interaction of heterocyclic HTBA(-) ions.

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Публикация на русском языке Головнёв, Николай Николаевич. Кристаллическая структура 2-тиобарбитурата калия / Н. Н. Головнёв // Журнал структурной химии : ФГУП "Издательство Сибирского отделения Российской акдемии наук", 2013. - Т. 54, № 3. - С. 512-516. - ISSN 0136-7463

Держатели документа:
Siberian Fed Univ, Krasnoyarsk, Russia
Russian Acad Sci, LV Kirensky Inst Phys, Siberian Div, Krasnoyarsk, Russia
Russian Acad Sci, Inst Chem & Chem Technol, Siberian Div, Krasnoyarsk, Russia;

Доп.точки доступа:
Molokeev, M. S.; Молокеев, Максим Сергеевич; Belash, M. Y.; Головнёв, Николай Николаевич
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2.


   
    Crystal structures of new potassium silicates and aluminosilicates of Sm, Tb, Gd, and Yb and their relation to the armstrongite (CaZr(Si6O15)·3H2O) structure / V. K. Taroev [et al.] // J. Solid State Chem. - 2015. - Vol. 227. - P. 196-203, DOI 10.1016/j.jssc.2015.03.004. - Cited References:27. - We appreciate the financial support by the Russian Fund of Basic Research under grant 10-05-00344-a. We thank the two anonymous reviewers for their helpful comments and suggestions and Ms. Schroeder (KIT-PKM) for improving the English of the manuscript. . - ISSN 0022. - ISSN 1095-726X. -
РУБ Chemistry, Inorganic & Nuclear + Chemistry, Physical
Рубрики:
BOND-VALENCE PARAMETERS
   CHAINS

   SYSTEM

Кл.слова (ненормированные):
Hydrothermal synthesis -- REE-potassium silicates -- X-ray diffraction -- Crystal structure refinement
Аннотация: Silicates of composition K7.81Sm3Si12O32(OH)0.81·0.77H2O and K7Tb3Si12O32·1.36H2O, with the space group P 1 ¯ and unit cell parameters of a=6.9218(3), b=11.4653(4), c=11.6215(4) Å, α=88.063(3)°, β=88.449(3)°, γ=79.266(3)° and a=6.872(3), b=11.440(5), c=11.542(6) Å, α=88.19(4)°, β=88.86(4)°, γ=79.65(4)°, respectively, were synthesized under hydrothermal conditions. Both crystal structures were determined from twinned crystals, and can be idealized to a composition of K7Ln3Si12O32 (KOH)x(H2O)(2−x) (Ln=Sm, Tb), which is closely related to K8Nd3Si12O32(OH). Crystals of the aluminosilicates K2GdAlSi4O12·0.25H2O and K2SmAlSi4O12·0.375H2O prepared by the same method possess monoclinic symmetry with the space group C2/c. The corresponding unit cell parameters are: a=26.67(1), b=7.294(3), c=14.835(6) Å, β=123.44(3)°; and a=26.7406(9), b=7.3288(2), c=14.8498 (6) Å, β=123.514(1)°, respectively. A new type of silicate anion that forms tubes was detected in the K4Yb2Si8O21 structure. K4Yb2Si8O21 is of monoclinic symmetry with the space group C2/c. The unit cell parameters are: a=17.440(2), b=11.786(1), c=12.802 (2) Å, and β=130.902(1)°. The structure is a mixed framework of tubes formed by silica-oxygen tetrahedra connected by pairs of edge sharing Yb-octahedra. The relation of the silicate layers and frameworks encountered in these compounds to the armstrongite silicate framework is discussed.

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Держатели документа:
RAS, Ap Vinogradov Geochem Inst, Siberian Branch, Irkutsk 664033, Russia
Natl Res Irkutsk State Tech Univ, Irkutsk 664054, Russia
RAS, Inst Earth Crust, Siberian Branch, Irkutsk 664054, Russia
Univ Hamburg, Mineral Petrog Inst, D-20146 Hamburg, Germany
Karlsruhe Inst Technol, ANKA Synchrotron Radiat Facil, D-76344 Eggenstein Leopoldshafen, Germany
RAS, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Taroev, V. K.; Kashaev, A. A.; Malcherek, T.; Goettlicher, J.; Kaneva, E. V.; Vasiljev, A. D.; Васильев, Александр Дмитриевич; Suvorova, L. F.; Suvorova, D. S.; Tauson, V. L.; Russian Fund of Basic Research [10-05-00344-a]
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3.


   
    Ferroelectric phase-transition study in potassium trihydroselenite by Se-77 high-precision NMR method / A. A. Sukhovskii [et al.] // Fiz. Tverd. Tela. - 1980. - Vol. 22, Is. 3. - P. 914-917. - Cited References: 11 . - ISSN 0367-3294
РУБ Physics, Condensed Matter


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Доп.точки доступа:
SUKHOVSKII, A. A.; KRIGER, A. I.; MOSKVICH, Y. N.; Lundin, A. G.; Лундин, Арнольд Геннадьевич
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4.


   
    Formation and evolution of magnetic nanoparticles in borate glass simultaneously doped with Fe and Mn oxides / J. . Kliava [et al.] // J. Appl. Phys. - 2008. - Vol. 104, Is. 10. - Ст. 103917, DOI 10.1063/1.3021289. - Cited References: 37. - A financial support from the Russian Foundation for Basic Research (RFBR)-CNRS (Grant No. 07-02-92174) is highly appreciated. R. Ivantsov is grateful to the Russian Science Support Foundation. Y. Yeshurun acknowledges the support of the Israel Scienc Foundation (ISF). . - ISSN 0021-8979
РУБ Physics, Applied
Рубрики:
COBALT FERRITE PARTICLES
   SUPERPARAMAGNETIC RESONANCE

   GAMMA-FE2O3 NANOPARTICLES

   MATRIX

   SIZE

   SYSTEMS

Кл.слова (ненормированные):
aluminium compounds -- borate glasses -- coercive force -- Faraday effect -- heat treatment -- iron compounds -- magnetic hysteresis -- magnetic particles -- magnetic susceptibility -- manganese compounds -- Mossbauer effect -- nanoparticles -- paramagnetic materials -- potassium compounds -- remanence -- superparamagnetism -- transmission electron microscopy -- X-ray chemical analysis -- Atomic spectroscopy -- Auger electron spectroscopy -- Crystal structure -- Electric relays -- Electronic medical equipment -- Ferrite -- Ferrites -- Glass -- Heat treatment -- Hysteresis -- Hysteresis loops -- Magnetic properties -- Magnetic resonance measurement -- Magnetic susceptibility -- Magnetism -- Manganese -- Manganese compounds -- Molybdenum -- Nanoparticles -- Optical properties -- Ozone water treatment -- Polydispersity -- Superparamagnetism -- Borate glasses -- Concentration ratios -- Electron magnetic resonances -- Emr spectrums -- Experimental techniques -- Faraday rotations -- Glass compositions -- Glass matrixes -- Glass preparations -- Magnetic measurements -- Magnetic nano particles -- Magnetic orders -- Magnetically ordered systems -- Magneto-optical properties -- Manganese ferrites -- Mean diameters -- Mn oxides -- Phase states -- Polydisperse nanoparticles -- Remnant magnetizations -- Ssbauer spectroscopies -- Superparamagnetic -- Superparamagnetic states -- Thermal treatments -- Variable temperatures -- Magnetic materials
Аннотация: Evolution of the phase state of paramagnetic additions at various stages of synthesis and subsequent thermal treatment of glasses of the system Al(2)O(3)-K(2)O-B(2)O(3) simultaneously doped with Fe(2)O(3) and MnO is studied by means of a combination of experimental techniques: Faraday rotation (FR), electron magnetic resonance (EMR), transmission electron microscopy (TEM), Mossbauer spectroscopy, and magnetic measurements. Both FR and EMR show that magnetically ordered clusters occur already at the first stage of the glass preparation. In particular, for the ratio of the Fe and Mn oxides in the charge close to 3:2, fine magnetic nanoparticles are formed with characteristics similar to those of manganese ferrite. By computer simulating the EMR spectra at variable temperatures, a superparamagnetic nature of these nanoparticles is confirmed and their mean diameter is estimated as approximately 3.2 nm. In the thermally treated glasses larger magnetic nanoparticles are formed, giving rise to FR spectra, characteristic of magnetically ordered systems, and the EMR spectra different from those in as-prepared glasses but also showing superparamagnetic narrowing. The Mossbauer spectroscopy corroborates the manganese ferrite structure of the nanoparticles and indicates their coexistence in the ferrimagnetic and superparamagnetic states. The TEM shows the presence of polydisperse nanoparticles on the background of the glass matrix, and electron diffraction of a selected region containing larger particles indicates a crystal structure close to that of MnFe(2)O(4). Energy-dispersive atomic x-ray spectra confirm that the major part of Fe and Mn introduced to the glass composition is gathered in the particles, with the concentration ratio close to 2:1, characteristic of bulk MnFe(2)O(4). Magnetic hysteresis loops of samples subjected to an additional thermal treatment demonstrate a strong increase in the coercive force, remnant magnetization, and high-field magnetic susceptibility with temperature decrease. The consistent results obtained using various techniques demonstrate that the formation of nanoparticles with characteristics close to those of MnFe(2)O(4) confers to these glasses magnetic and magneto-optical properties typical of substances possessing magnetic order.

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Держатели документа:
[Kliava, J.] Univ Bordeaux 1, CNRS, UMR 5798, CPMOH, F-33405 Talence, France
[Edelman, I.
Ivanova, O.
Ivantsov, R.
Bayukov, O.
Petrakovskaja, E.
Stepanov, S.] RAS, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Zaikovskiy, V.] RAS, Siberian Branch, Boreskov Inst Catalysis, Novosibirsk 630090, Russia
[Bruckental, I.
Yeshurun, Y.] Bar Ilan Univ, Dept Phys, IL-52900 Ramat Gan, Israel
[Stepanov, S.] SI Vavilov State Opt Inst, St Petersburg 199034, Russia
ИФ СО РАН
CPMOH, Universit? Bordeaux, 1-CNRS UMR 5798, 33405 Talence Cedex, France
Kirensky Institute of Physics, Siberian Branch of RAS, 660036 Krasnoyarsk, Russian Federation
Boreskov Institute of Catalysis, Siberian Branch, RAS, 630090 Novosibirsk, Russian Federation
Department of Physics, Bar-Ilan University, Ramat-Gan 52900, Israel
S. I. Vavilov State Optical Institute, St. Petersburg 199034, Russian Federation

Доп.точки доступа:
Kliava, J.; Edelman, I. S.; Эдельман, Ирина Самсоновна; Ivanova, O. S.; Иванова, Оксана Станиславовна; Ivantsov, R. D.; Иванцов, Руслан Дмитриевич; Bayukov, O. A.; Баюков, Олег Артемьевич; Petrakovskaja, E. A.; Петраковская, Элеонора Анатольевна; Zaikovskiy, V.; Bruckental, I.; Yeshurun, Y.; Stepanov, S.
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5.


   
    Heat capacity, thermal expansion and barocaloric effect in fluoride K2TaF7 / I. N. Flerov [et al.] // J. Mater. Sci. - 2019. - Vol. 54, Is. 23. - P. 14287–14295, DOI 10.1007/s10853-019-03924-8. - Cited References: 20. - The reported study was funded by RFBR according to the research Project No. 18-02-00269_a. . - ISSN 0022-2461
Кл.слова (ненормированные):
Expansion -- Fluorine compounds -- Specific heat -- Tantalum compounds -- Thermal expansion -- Barocaloric effects -- First-order phase transitions -- High sensitivity -- Low pressures -- Temperature phase -- Volume strain -- Potassium compounds
Аннотация: The heat capacity and thermal expansion of potassium heptafluorotantalate were studied. The room temperature phase P21/c is stable at least to 4 K. The strong first-order phase transition P21/c−Pnma at T0=486.2K is accompanied by giant changes in the entropy, ΔS0=22.3J(molK)−1, and volume strain, δV0/V=−3.6%. A rather high sensitivity of K2TaF7 to pressure was found, dT0/dp=−220KGPa−1. Significant extensive and intensive barocaloric effects are found at low pressure. The possibility of improving the barocaloric properties is discussed.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Institute of Engineering Physics and Radioelectronics, Siberian Federal University, Krasnoyarsk, 660074, Russian Federation
Astafijev Krasnoyarsk State Pedagogical University, Krasnoyarsk, 660049, Russian Federation
Institute of Chemistry, Far East Branch, Russian Academy of Sciences, Vladivostok, 690022, Russian Federation

Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Gorev, M. V.; Горев, Михаил Васильевич; Kartashev, A. V.; Карташев, Андрей Васильевич; Pogorel'tsev, E. I.; Погорельцев, Евгений Ильич; Laptash, N. M.
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6.


   
    High ionic conductivity of K5-xTlx(Mg0.5Hf1.5)(MoO4)6 (0 ≤ х ≤ 5) solid solutions / V. G. Grossman, M. S. Molokeev, J. G. Bazarova, B. G. Bazarov // Solid State Sci. - 2022. - Vol. 134. - Ст. 107027, DOI 10.1016/j.solidstatesciences.2022.107027. - Cited References: 39. - The work was supported by Basic Project of BINM SB RAS №0273-2021-0008. Structural analysis of materials in this study was partly supported by the Research Grant No. 075-15-2019-1886 from the Government of the Russian Federation . X-ray powder diffraction and thermal analysis were obtained using the equipment of the Collective Use Center BINM SB RAS . - ISSN 1293-2558
   Перевод заглавия: Высокая ионная проводимость твердых растворов K5-xTlx(Mg0.5Hf1.5)(MoO4)6 (0 ≤ х ≤ 5)
Кл.слова (ненормированные):
Synthesis -- Thallium -- Potassium -- Molybdates -- DSC -- Conducting material
Аннотация: Novel K5-xTlx(Mg0.5Hf1.5)(MoO4)6 (0 ≤ х ≤ 5) oxides were successfully synthesized by solid state reaction. The results indicate the formation of a continuous series of solid solutions with the NASICON-like structure (sp. gr. R3¯c) in the composition range 0 < x < 5. The unit-cell parameters of the solid solutions increase linearly with composition, as a consequence of thallium substitution for potassium. The cation conductivity of Tl5Mg0.5Hf1.5(MoO4)6 has been shown to exceed the conductivity of the parent potassium magnesium hafnium molybdate. The highest total conductivity of 2.49 × 10−3 S/cm was found at 831 K for Tl5Mg0.5Hf1.5(MoO4)6.

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Держатели документа:
Baikal Institute of Nature Management, SB RAS, Sakhyanovoy St., 6, Ulan-Ude, 670047, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC, Siberian Branch, Academy of Sciences, 50 / 38 Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, 82 Svobodniy Av., Krasnoyarsk, 660041, Russian Federation
Department of Physics, Far Eastern State Transport University, Serysheva str. 47, Khabarovsk, 680021, Russian Federation

Доп.точки доступа:
Grossman, V. G.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Bazarova, J. G.; Bazarov, B. G.
}
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7.


   
    Improving corrosion resistance of Cu-Al-based anodes in KF-AlF3-Al2O3 melts / S. K. Padamata, A. Yasinskiy, A. Shabanov [et al.] // Trans. Nonferrous Met. Soc. China. - 2022. - Vol. 32, Is. 1. - P. 354-363, DOI 10.1016/S1003-6326(22)65800-X. - Cited References: 24. - The work is performed as a part of the State Assignment for the Science of Siberian Federal University, Russia (No. FSRZ-2020-0013) . Use of Krasnoyarsk Regional Center of Research Equipment of Federal Research Center "Krasnoyarsk Science Center SB RAS" is acknowledged . - ISSN 1003-6326. - ISSN 2210-3384
РУБ Metallurgy & Metallurgical Engineering
Рубрики:
NI-FE
   ALUMINUM ELECTROLYSIS

   INERT ANODES

   NICKEL FERRITE

   BEHAVIOR

Кл.слова (ненормированные):
inert anodes -- potassium cryolite -- Cu-Al alloys -- corrosion -- aluminium electrolysis -- oxygen-evolving electrodes
Аннотация: The anodic behaviour of pre-oxidised and non-oxidised Cu−Al-based anodes (Cu−10Al and Cu−9.8Al−2Mn) in KF−AlF3−Al2O3 melts was studied through galvanostatic and potentiodynamic polarization techniques. The alloy compositions were oxidised for a short-term (8 h) at 700 °C, followed by galvanostatic polarization for 1 h at 800 °C with an applied current density of 0.4 A/cm2. The potentiodynamic curves were recorded with a sweep rate of 0.01 V/s. XRD analysis was conducted on frozen melt samples collected on the surface of the anode, and SEM observation was performed on the anode after the experiment to study the phases of the scales formed on the alloys. All the anode materials had a steady potential between 2.30 and 2.50 V(vs Al/AlF3). The corrosion rates of the anodes were calculated from the data acquired through potentiodynamic polarization. It was seen that pre-oxidised anodes possess a low corrosion rate compared to those without pre-oxidation treatment.

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Держатели документа:
Siberian Fed Univ, Lab Phys & Chem Met Proc & Mat, Krasnoyarsk, Russia.
Krasnoyarsk Sci Ctr SB RAS, Lab Mol Spect, Krasnoyarsk, Russia.
Northeastern Univ, Sch Met, Shenyang 110819, Peoples R China.

Доп.точки доступа:
Padamata, Sai Krishna; Yasinskiy, Andrey; Shabanov, A. V.; Шабанов, Александр Васильевич; Bermeshev, Timofey; Yang, You-jian; Wang, Zhao-wen; Cao, Dao; Polyakov, Peter; State Assignment for the Science of Siberian Federal University, Russia [FSRZ-2020-0013]
}
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8.


    Melnikova, S. V.
    Influence of atmospheric humidity on the symmetry and phase transitions of layered potassium oxyfluorides K2NbOF5 center dot H2O / S. V. Melnikova, N. M. Laptash // Phys. Solid State. - 2013. - Vol. 55, Is. 6. - P. 1231-1235, DOI 10.1134/S1063783413060243. - Cited References: 8. - This study was supported by the Council on Grants from the President of the Russian Federation (grant no. NSh-4828.2012.2). . - ISSN 1063-7834
РУБ Physics, Condensed Matter
Рубрики:
OXOPEROXOFLUORO COMPLEXES
   MO V

   CRYSTAL STRUCTURE

   OXOFLUORO

   MONOHYDRATE

Аннотация: Crystals of K2NbOF5 center dot H2O have been grown, polarization optical investigations have been performed, and the birefringence and rotation angle of the optical indicatrix have been measured in the temperature range 100-400 K. It has been found that, depending on the degree of atmospheric humidity, the layered K2NbOF5 center dot H2O crystal at room temperature can be in three states, namely, A, B, and C, which differ in symmetry and properties of the crystal. The K2NbOF5 center dot H2O crystal in the A state exists at a relative humidity RH = 90-100% and undergoes a first-order improper ferroelastic phase transition P a dagger" C2/m, which is accompanied by strong anomalies of the optical characteristics, twinning, and shear strain x (6) at temperatures T (2) (a dagger") = 308 K and T (2) (a dagger) = 313 K. The most stable state of the K2NbOF5 sdH(2)O crystal is the B state (RH = 20-90%), which retains the monoclinic symmetry C2/m in the temperature range 100-370 K. In a dry atmosphere (RH = 0-20%) or at T (1) a parts per thousand 370 K, the crystal becomes anhydrous (K2NbOF5) with the symmetry P4/nmm (the C state). The difference between the crystals in the states A and B is explained by the presence or absence of water molecules in interlayer spaces.

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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Russian Acad Sci, Inst Chem, Far Eastern Branch, Vladivostok 690022, Russia

Доп.точки доступа:
Laptash, N. M.; Мельникова, Светлана Владимировна
}
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9.


    Mel'nikova, S. V.
    Influence of atmospheric humidity on the symmetry and phase transitions of layered potassium oxyfluorides K2NbOF5 · H2O / S. V. Mel'nikova, N. M. Laptash // Phys. solid state. - 2013. - Vol. 55, Is. 6. - P. 1231-1235
Аннотация: Crystals of K2NbOF5 · H2O have been grown, polarization optical investigations have been performed, and the birefringence and rotation angle of the optical indicatrix have been measured in the temperature range 100–400 K. It has been found that, depending on the degree of atmospheric humidity, the layered K2NbOF5 · H2O crystal at room temperature can be in three states, namely, A, B, and C, which differ in symmetry and properties of the crystal. The K2NbOF5 · H2O crystal in the A state exists at a relative humidity RH = 90–100% and undergoes a first-order improper ferroelastic phase transition P 1ˉ ↔ C2/m, which is accompanied by strong anomalies of the optical characteristics, twinning, and shear strain x 6 at temperatures T 2 ↓ = 308 K and T 2 ↑= 313 K. The most stable state of the K2NbOF5 sdH2O crystal is the B state (RH = 20–90%), which retains the monoclinic symmetry C2/m in the temperature range 100–370 K. In a dry atmosphere (RH = 0–20%) or at T 1 ≈ 370 K, the crystal becomes anhydrous (K2NbOF5) with the symmetry P4/nmm (the C state). The difference between the crystals in the states A and B is explained by the presence or absence of water molecules in interlayer spaces.

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Публикация на русском языке Мельникова, Светлана Владимировна. Влияние атмосферной влажности на симметрию и фазовые переходы слоистых калиевых оксифторидов K2NbOF5·H2O / С. В. Мельникова // Физика твердого тела. - 2013. - Т. 55. Вып. 6. - С. 1142-1146


Доп.точки доступа:
Laptash, N. M.; Лапташ, Н. М.; Мельникова, Светлана Владимировна
}
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10.


   
    MOSSBAUER STUDY OF POTASSIUM FERRITES / O. A. BAYUKOV [и др.] // Fiz. Tverd. Tela. - 1993. - Vol. 35, Is. 6. - P. 1449-1456. - Cited References: 16 . - ISSN 0367-3294
РУБ Physics, Condensed Matter
Рубрики:
BETA-ALUMINA

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Доп.точки доступа:
BAYUKOV, O. A.; PETRAKOVSKII, G. A.; SABLINA, K. A.; MATVEIKO, E. N.
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