Центральная Научная Библиотека УрО РАН

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   S 98


    Synthesis, crystal structure and luminescent properties of pyrovanadatesA2CaV2O7 (A јRb, Cs) / V. G. Zubkov [et al.] // Solid State Sciences. - 2009. - Vol. 11. - P.726-732 : il. - Bibliogr. : p. 731-732 (29 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ОКСИВАНАДАТ РУБИДИЯ -- ОКСИВАНАДАТ ЦЕЗИЯ -- ПИРОВАНАДАТЫ -- ДИФРАКТОГРАММЫ ПОРОШКОВЫЕ -- ДИФРАКТОМЕТРИЯ РЕНТГЕНОВСКАЯ -- ДИФРАКЦИЯ ЭЛЕКТРОННАЯ -- ФОТОЛЮМИНЕСЦЕНЦИЯ
Аннотация: The novel vanadium oxides Rb2CaV2O7 and Cs2CaV2O7 have been prepared by solid-state reaction and their crystal structures determined and refined using X-ray, neutron powder and electron diffraction data. Rb2CaV2O7 and Cs2CaV2O7 are isostructural, crystallizing in space group P21/n with unit cell parameters: a= 13.8780(1), b = 5.96394(5), c = 10.3376(1) Е, beta = 104.960(1) and a= 14.0713(2),b = 6.0934(1), c=10.5944(1) A, beta = 104.608(1), respectively. Their crystal structures can be described as a framework of CaO6 octahedra and V2O7 pyrogroups with alkaline metals found in the tunnels formed. Photoluminescence (PL) and PL excitation spectra of the considered pyrovanadates have been studied in??the vacuum ultraviolet (VUV) to visible light (Vis) range as well as their pulse cathode luminescence (PCL) spectra and the kinetic parameters of PCL. In the PL and the PCL spectra of both pyrovanadates??recorded at T ј 300 K a broad band with maxima at 2.2, 2.4 eV and two shoulders (bands) at 2.0 and 2.58 eV have been observed. At Tј 10 K the band at 2.0 eV becomes the main band in the spectra. Two types of luminescence centers for each pyrovanadate, with very similar excitation bands at 3.75, 4.84, 6.2,??7.3 and 9.1 eV, have been found. The nature of the luminescence centers connected with the bands at 2.0,2.2, 2.4 and 2.58 eV is discussed

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   K 80

    Kozhevnikova, N. S.
    Preparation of Stable Colloidal Solution of Cadmium Sulfide CdS Using Ethylenediaminetetraacetic Acid / N. S. Kozhevnikova, A. S. Vorokh, A. A. Rempel // Russian Journal of General Chemistry. - 2010. - Vol. 80, № 3. - P391-394 : il. - Bibliogr. : p. 394 (19 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
КОЛЛОИДНЫЕ РАСТВОРЫ -- СУЛЬФИД КАДМИЯ -- ОРГАНИЧЕСКАЯ ХИМИЯ
Аннотация: By the method of chemical condensation a stable aqueous colloidal solution of nanoparticles of cadmium sulfide was obtained. The solution obtained in the daylight had a bright lemon-yellow color. For the temporary stabilization of the solution was used an organic complexone, disodium ethylenediaminetetraacetate (EDTA), that prevented coagulation of colloidal particles up to several months at 4°C. At room temperature, the solution remained stable during a month. The structure and properties of the disperse phase were studied by the X-ray diffraction, optical fluorescence, and electron microscopy. The solid particles size is about 3 nm, they have a disordered close-packed structure with the space group P6mm and possess the photoluminescence color from green to orange depending on the duration of keeping the solution. The size of coagulates was 10 nm, 100 nm, and 1 μm after keeping for 1, 2, and 4 months, respectively

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   Z 90

    Zuev, M. G.
    Nonradiative relaxation of excitation energy in the photoluminescence of crystals / M. G. Zuev // Russian Physics Journal. - 1977. - Vol. 20, № 1. - P111-112 : il. - Bibliogr. : p. 112 (1 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ФОТОЛЮМИНЕСЦЕНЦИЯ -- КРИСТАЛЛЫ

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   P 93


    Properties of the amorphous-nanocrystalline Gd2O3 powder prepared by pulsed electron beam evaporation / G. V. Ionov, S. Yu. Sokovnin, S. A. Uporov, M. G. Zuev // Physics of the Solid State. - 2013. - Vol. 55, № 6. - С. 1262-1271

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
НАНОПОРОШКИ -- ФАЗОВЫЕ ПРЕВРАЩЕНИЯ -- ФОТОЛЮМИНЕСЦЕНЦИЯ
Аннотация: An amorphous-nanocrystalline Gd2O3 powder with a specific surface area of 155 m2/g has been prepared using pulsed electron beam evaporation in vacuum. The nanopowder consists of 20- to 500-nm agglomerates formed by crystalline nanoparticles (3–12 nm in diameter) connected by amorphous-nanocrystalline strands. At room temperature, the Gd2O3 nanopowder exhibits a paramagnetic behavior. The phase transformations occurring in the powder have been investigated using differential scanning calorimetry and thermogravimetry (40–1400°C). The amorphous phase of the nanopowder is thermally stable up to a temperature of 1080°C. It has been found that the amorphous phase has an inhibitory effect on the temperature of the polymorphic transformation from the cubic phase into the monoclinic phase. It has been revealed that, compared with the microcrystalline powder, the Gd2O3 nanopowder is characterized by a complete quenching of photoluminescence.

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   Z 90

    Zuev, M. G.
    Research of nanopowders properties of new x-ray contrast substances and the phosphors produced by a method of pulsed electron beam evaporation / M. G. Zuev, V. G. Il`ves , S. Yu. Sokovnin // Известия высших учебных заведений. Физика. - 2012. - Т. 55, № 12-3. - С. 223-226

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ПУЧКИ ЭЛЕКТРОНОВ -- НАНОПОРОШКИ -- РЕНТГЕНОКОНТРАСТНЫЕ ПРЕПАРАТЫ
Аннотация: For the first time using pulsed electron evaporation were produced nanopowders of YTaO 4, LaTaO 4 X-ray contrast substances and phosphors Sr 2Y 8(SiO 4) 6O 2:Eu with oxyapatite structure with a specific surface to 184 m 2/g. Characteristics nanopowders were studied by methods of XRD, electronic microscopy of the high permission, electrongraphy, pulsed cathodeluminescence and photoluminescence. The analysis of a photoluminescence spectrum of phosphor has shown that the luminescence spectrum has changed in comparison with a micropowder of the same structure. The Eu 3+ luminescence spectrum containes smaller number of lines, than Eu 3+ spectrum of the micron size particles. Besides the shift of spectral lines was observed. There was also a reduction of intensity red and increase orange spectrum lines. After roasting on the air the nanophosphor spectrum of luminescence Eu 3+ has coincided with that one for microparticles. Thus, the effect of quantum restriction on position of power levels was observed, apparently. The size of particles of a phosphor has influenced its spectral structure. X-ray contrast properties nanopowders researches were tested in odontology, essential influence, especially in 3D geometry is established.

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