Библиотека института физики им. Л.В. Киренского СО РАН

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Каталог книг и брошюр библиотеки ИФ СО РАН

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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrov K. S., Ivanov Y. N., Schafer A. D.
Заглавие : Spectroscopic investigation of phase transitions in CsLiMoO//4 crystals.
Коллективы : European Meeting on Ferroelectricity
Место публикации : European Meeting on Ferroelectricity (5 ; 1983 ; Sept. ; 26-30 ; Malaga, Sp). Ferroelectrics. - 1983. - Vol. 55, Is. 1. - P.671-674. - ISSN 0015-0193
Ключевые слова (''Своб.индексиров.''): crystals - structure--magnetic resonance--spectroscopy, raman--cesium lithium molybdate--phase transitions--ferroelectric materials
Аннотация: Raman and NMR spectra in cubic and two distorted phases of CsLiMoO//4 have been studied. Phase transitions in the crystal are shown to belong to order-disorder type.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Atuchin V. V., Khyzhun O. Y., Chimitova O. D., Molokeev M. S., Gavrilova T. A., Bazarov B. G., Bazarova J. G.
Заглавие : Electronic structure of β-RbNd(MoO4)2 by XPS and XES
Коллективы : Ministry of Education and Science of the Russian Federation; RFBR [12-02-90806-mol_rf_nr]
Место публикации : J. Phys. Chem. Solids. - 2015. - Vol. 77. - P.101-108. - ISSN 0022-3697, DOI 10.1016/j.jpcs.2014.09.012
Примечания : Cited References: 52. - This study was partially supported by the Ministry of Education and Science of the Russian Federation and RFBR Grant 12-02-90806-mol_rf_nr.
Предметные рубрики: RAY-EMISSION-SPECTROSCOPY
CRYSTAL-STRUCTURE
PHOTOELECTRON-SPECTROSCOPY
LUMINESCENCE PROPERTIES
VIBRATIONAL PROPERTIES
PHOTOEMISSION SPECTRA
OPTICAL-PROPERTIES
TERNARY MOLYBDATE
AB-INITIO
SYSTEM
Ключевые слова (''Своб.индексиров.''): inorganic compounds--chemical synthesis--photoelectron spectroscopy--x-ray diffraction--electronic structure
Аннотация: β-RbNd(MoO4)2 microplates have been prepared by the multistage solid state synthesis method. The phase composition and micromorphology of the final product have been evaluated by XRD and SEM methods. The electronic structure of β-RbNd(MoO4)2 molybdate has been studied employing the X-ray photoelectron spectroscopy (XPS) and X-ray emission spectroscopy (XES). For the molybdate, the XPS core-level and valence-band spectra, as well as XES bands representing energy distribution of the Mo 4d- and O 2p-like states, have been measured. It has been established that the O 2p-like states contribute mainly to the upper portion of the valence band with also significant contributions throughout the whole valence-band region. The Mo 4d-like states contribute mainly to a lower valence band portion
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Atuchin V. V., Aleksandrovsky A. S., Bazarov B. G., Bazarova J. G., Chimitova, Olga D., Denisenko, Yuriy G., Gavrilova T. A., Krylov A. S., Maximovskiy, Eugene A., Molokeev M. S., Oreshonkov A. S., Pugachev, Alexey M., Surovtsev, Nikolay V.
Заглавие : Exploration of structural, vibrational and spectroscopic properties of self-activated orthorhombic double molybdate RbEu(MoO4)2 with isolated MoO4 units
Коллективы : RFBR [16-52-48010, 17-52-53031, 18-03-00557]; Ministry of Science and Higher Education of the Russian Federation [0339-2016-0007]; Act 211 Government of the Russian Federation [02.A03.21.0011]; Ministry of Education and Science of the Russian Federation [4.1346.2017/4.6]
Место публикации : J. Alloy. Compd. - 2019. - Vol. 785. - P.692-697. - ISSN 0925-8388, DOI 10.1016/j.jallcom.2019.01.013. - ISSN 1873-4669(eISSN)
Примечания : Cited References: 42. - The reported study was funded by RFBR according to research projects 16-52-48010, 17-52-53031 and 18-03-00557. Besides, this study was supported by the Ministry of Science and Higher Education of the Russian Federation (project 0339-2016-0007). The work was supported by Act 211 Government of the Russian Federation, contract No 02.A03.21.0011. Additionally, the work was partially supported by the Ministry of Education and Science of the Russian Federation (4.1346.2017/4.6).
Предметные рубрики: MORPHOLOGY-CONTROLLED SYNTHESIS
LUMINESCENCE PROPERTIES
Ключевые слова (''Своб.индексиров.''): rubidium europium molybdate--solid state reaction--rietveld refinement--dsc--raman luminescence
Аннотация: RbEu(MoO4)2 is synthesized by the two-step solid state reaction method. The crystal structure of RbEu(MoO4)2 is defined by Rietveld analysis in space group Pbcn with cell parameters a = 5.13502(5), b = 18.8581(2) and c = 8.12849(7) Å, V = 787.13(1) Å3, Z = 4 (RB = 0.86%). This molybdate possesses its phase transition at 817 K and melts at 1250 K. The Raman spectra were measured with the excitation at λ = 1064 and 514.5 nm. The photoluminescence spectrum is evaluated under the excitation at 514.5 nm. The absolute domination of hypersensitive 5D0→7F2 transition is observed. The ultranarrow 5D0→7F0 transition in RbEu(MoO4)2 is positioned at 580.2 nm being 0.2 nm blue shifted, with respect to that in Eu2(MoO4)3.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Grossman V., Adichtchev S. V., Atuchin V. V., Bazarov B. G., Bazarova J. G., Kuratieva N., Oreshonkov A. S., Pervukhina N. V., Surovtsev N. V.
Заглавие : Exploration of the structural and vibrational properties of the ternary molybdate Tl5BiHf(MoO4)6with isolated MoO4 units and Tl+ conductivity
Место публикации : Inorg. Chem. - 2020. - Vol. 59, Is. 17. - P.12681-12689. - ISSN 00201669 (ISSN), DOI 10.1021/acs.inorgchem.0c01762
Примечания : Cited References: 69. - This study was supported by the Russian Science Foundation (19-42-02003, in the part of conceptualization). The study was also funded by the RFBR according to research projects 18-08-00985, 18-08-00799, and 18-03-00557. This study was carried out within the state assignment of the FASO of Russia (Theme No. 0339-2016-0007)
Аннотация: The phase relations in the subsolidus region of the Tl2MoO4–Bi2(MoO4)3–Hf(MoO4)2 system were studied with the “intersecting cuts” method. The formation of the novel ternary molybdate Tl5BiHf(MoO4)6 is found in this ternary system. The compound has a phase transition at Tpt = 731 K (ΔH = −3.15 J/g) and melts at Tm = 871 K (ΔH = −41.71 J/g), as determined by a thermal analysis. Tl5BiHf(MoO4)6 single crystals were obtained by the spontaneous nucleation method. The crystal structure of Tl5BiHf(MoO4)6 was revealed by structure analysis methods. This molybdate crystallizes in the trigonal space group R3̅c with the unit cell parameters a = 10.6801(4) Å, c = 38.5518(14) Å, V = 3808.3(2) Å3, and Z = 6. The vibrational characteristics of Tl5BiHf(MoO4)6 were determined by Raman spectroscopy. The Tl5BiHf(MoO4)6 conductivity was measured at frequencies of 0.1, 1.0, and 10 kHz in the temperature range of 293–773 K; in this temperature range, the conductivity level was 10–12–10–7 S/cm.
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Вид документа : Статья из журнала
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Автор(ы) : Aleksandrov K. S., ANISTRATOV A. T., Melnikova S. V., Klevtsov P. V., Kruglik A. I., Voronov V. N.
Заглавие : Ferroelectricity in caesium lithium molybdate CsLiMoO4 and related crystals CsLiWO4 and RbLiMoO4
Коллективы : International meeting on ferroelectricity
Место публикации : International meeting on ferroelectricity (5 ; 1981 ; 17-21 Aug. ; Universal Park, USA). Ferroelectrics. - 1981. - Vol. 36, Is. 1. - P.399-402. - ISSN 0015-0193, DOI 10.1080/00150198108218138
Ключевые слова (''Своб.индексиров.''): cesium compounds--rubidium compounds--cesium lithium molybdate--cesium lithium tungstate--phase transitions--rubidium lithium molybdate--ferroelectric materials
Аннотация: Successive ferroelectric phase transitions were discovered in CsLiMoO//4, CsLiWO//4 and RbLiMoO//4 single crystals. Strong elastic and no dielectric anomalies were found with temperature lowering in the initial cubic phases. The phase transitions are qualitatively described as pseudoproper ferroelectric ones.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrov K. S., Anistratov A. T., Melnikova S. V., Kruglik A. I., Zherebtsova L. I., Shabanova L. A.
Заглавие : Ferroelectricity in CS-Li molybdate crystals
Место публикации : Fiz. Tverd. Tela: Mezhdunarodnaya kniga, 1982. - Vol. 24, Is. 4. - P.1094-1101. - ISSN 0367-3294
Примечания : Cited References: 9
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Вид документа : Статья из журнала
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Автор(ы) : Lim C. S., Atuchin V. V., Aleksandrovsky A. S., Molokeev M. S., Oreshonkov A. S.
Заглавие : Incommensurately modulated structure and spectroscopic properties of CaGd2(MoO4)4:Ho3+/Yb3+ phosphors for up-conversion applications
Место публикации : J. Alloys Compd.: Elsevier, 2017. - Vol. 695. - P.737-746. - ISSN 09258388 (ISSN), DOI 10.1016/j.jallcom.2016.06.134
Примечания : Cited References: 60. - This research was supported by the Basic Science Research Program through the National Research Foundation of Korea funded by the Ministry of Education (2015-058813) and the Russian Foundation for Basic Research (15-52-53080). VVA, ASA and ASO were partially supported by the Ministry of Education and Science of the Russian Federation.
Ключевые слова (''Своб.индексиров.''): modulation--molybdate--raman--sol-gel synthesis--upconversion--xrd
Аннотация: CaGd2(MoO4)4:Ho3+/Yb3+ phosphors doped by Ho3+ and Yb3+ (Ho3+ = 0 and 0.05, and Yb3+ = 0, 0.35, 0.40, 0.45 and 0.50) were successfully synthesized by the microwave sol-gel method. The synthesized particles, being formed after heat-treatment at 900 °C for 16 h, showed a well crystallized morphology. All compounds are (3 + 2)D incommensurately modulated with superspace group I41/a(α,β,0)00(-β,α,0)00. It was found that parameter (α2 + β2)1/2 is proportional to cell parameter a for all studied compositions and, therefore, modulation vector k is the same for all known CaRE2(MoO4)4 compounds. The modulation vector invariance is a specific and valuable feature of this type of the structure. Under the excitation at 980 nm, the doped particles exhibited the yellow emission composed of green (545-nm) and red (655-nm) emission bands due to frequency upconversion (UC). The pump power dependence and CIE chromaticity of the UC emission were evaluated. The shape of UC bands in CaGd2(MoO4)4:Ho3+/Yb3+ is dependent on the Yb content due to the influence of the crystal field affecting a holmium ion. 13 Raman-active modes of the CaGd2(MoO4)4 lattice were identified via a comparison of experimental Raman spectra and the lattice dynamics simulation results. Four additional Raman lines were found in the region of stretching vibrations and, at least, two additional modes are present in the bending mode region. These additional modes are ascribed to incommensurate crystal lattice modulation. Luminescence bands of Ho ions are severely broadened due to a statistical disorder in the CaGd2−xYby (MoO4)4 lattice.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lim, Chang Sung, Aleksandrovsky A. S., Atuchin V. V., Molokeev M. S., Oreshonkov A. S.
Заглавие : Microwave sol-gel synthesis, microstructural and spectroscopic properties of scheelite-type ternary molybdate upconversion phosphor NaPbLa(MoO4)3:Er3+/Yb3+
Место публикации : J. Alloys Compd. - 2020. - Vol. 826. - Ст.152095. - ISSN 0925-8388 (ISSN), DOI 10.1016/j.jallcom.2019.152095. - ISSN 1873-4669 (eISSN)
Примечания : Cited References: 53. - This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning (2018R1D1A1A09082321). This study was supported by the Russian Science Foundation (19-42-02003, in part of conceptualization). Also, this study was supported by RFBR (18-32-20011, 18-03-00750).
Аннотация: New ternary molybdate NaPbLa(1-x-y)(MoO4)3:xEr3+,yYb3+ (x = y = 0, x = 0.05 and y = 0.35, 0.4, 0.45 and 0.5) phosphors were successfully fabricated by the MSG (microwave sol-gel) method, and the microstructural and spectroscopic properties were characterized. The crystal structure of NaPbLa(MoO4)3 (NPLM) was defined by Rietveld analysis in space group I41/a with unit cell parameters a = 5.3735(2) and c = 11.8668(4) Å, V = 342.65(3) Å3, Z = 4 (RB = 6.64%). The unit cell volume of NaPbLa(MoO4)3 (NPLM) was intermediate between those of NaLa(MoO4)2 and PbMoO4. Under the 980 nm excitation, upconverted yellowish-green emissions at transitions from 2H11/2 and 4S3/2 were observed. No concentration quenching in the subsystem of donor ions at the content up to 50 at.% and no cross-relaxation losses in the subsystem of acceptor ions at the concentrations as high as 5 at. % were verified. The individual chromaticity points for the NaPbLa(MoO4)3:Er3+,Yb3+ phosphors, corresponding to the equal-energy point in the standard CIE diagram, revealed yellowish-green emissions.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lim C. S., Aleksandrovsky A. S., Molokeev M. S., Oreshonkov A. S., Atuchin V. V.
Заглавие : Microwave synthesis and spectroscopic properties of ternary scheelite-type molybdate phosphors NaSrLa(MoO4)3:Er3+,Yb3+
Место публикации : J. Alloys Compd.: Elsevier, 2017. - Vol. 713. - P.156-163. - ISSN 09258388 (ISSN), DOI 10.1016/j.jallcom.2017.04.060
Примечания : Cited References: 87. - This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2016-944122) and by Project № 0356-2015-0412 of SB RAS Program №II.2P. The reported study was funded by RFBR according to the research project 16-52-48010 and 17-52-53031. Also, the work was supported by Act 211 Government of the Russian Federation, contract 02.A03.21.0011 and by the Ministry of Education and Science of the Russian Federation (4.1346.2017/PP).
Ключевые слова (''Своб.индексиров.''): microwave synthesis--crystal structure--molybdate phosphor--frequency up conversion
Аннотация: Ternary scheelite-type molybdate NaSrLa(1-x-y)(MoO4)3:xEr3+,yYb3+ (x = y = 0, x = 0.1 and y = 0.2, x = 0.05 and y = 0.45, x = 0.2 and y = 0) phosphors were successfully synthesized by the microwave sol-gel method for the first time. Well-crystallized particles formed after the heat-treatment at 900 °C for 16 h showed a fine and homogeneous morphology with a particle size of 2–3 ?m. The crystal structures were refined by the Rietveld method in space group I41/a. The optical properties were examined comparatively using photoluminescence emission and Raman spectroscopy. Under the excitation at 980 nm, the NaSrLa0.7(MoO4)3:0.1Er3+,0.2Yb3+ and NaSrLa0.5(MoO4)3:0.05Er3+,0.45Yb3+ particles exhibited a strong 525-nm emission band, a weaker 550-nm emission band in the green region and weak 655-nm, 490-nm and 410-nm emission bands in the red, blue and violet regions. The pump power dependence and Commission Internationale de L'Eclairage chromaticity of the upconversion emission intensity were evaluated in detail. The presence of Sr in NaSrLa(MoO4)3, in comparison with NaCaLa(MoO4)3 compound, leads to frequency shift mainly in the low region of Raman spectra. The MoO4 bending vibrations are most susceptible to changes in the distance between the nearest oxygen atoms in the nearest neighboring MoO4 groups.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lim C. S., Aleksandrovsky A. S., Atuchin V., Molokeev M. S., Oreshonkov A. S.
Заглавие : Microwave-employed sol–gel synthesis of scheelite-type microcrystalline AgGd(MoO4)2:Yb3+/Ho3+ upconversion yellow phosphors and their spectroscopic properties
Место публикации : Crystals. - 2020. - Vol. 10, Is. 11. - Ст.1000. - P.1-14. - ISSN 20734352 (ISSN), DOI 10.3390/cryst10111000
Примечания : Cited References: 58. - This study was supported by the Research Program through the Campus Research Foundation funded by Hanseo University in 2020 (201Yunghap09)
Аннотация: AgGd(MoO4)2:Ho3+/Yb3+ double molybdates with five concentrations of Ho3+ and Yb3+ were synthesized by the microwave employed sol–gel based process (MES), and the crystal structure variation, concentration effects, and spectroscopic characteristics were investigated. The crystal structures of AgGd1−x−yHoxYby(MoO4)2 (x = 0, 0.05; y = 0, 0.35, 0.4, 0.45, 0.5)at room temperature were determined in space group I41/a by Rietveld analysis. Pure AgGd(MoO4)2 has a scheelite-type structure with mixed occupations of (Ag,Gd) sites and cell parameters a = 5.24782 (11) and c = 11.5107 (3) Å, V = 317.002 (17) Å3, Z = 4. In doped samples, the sites are occupied by a mixture of (Ag,Gd,Ho,Yb) ions, which provides a linear cell volume decrease with the doping level increase. Under the excitation at 980 nm, AGM:0.05Ho,yYb phosphors exhibited a yellowish green emission composed of red and green emission bands according to the strong transitions 5F5 → 5I8 and 5S2/5F4 → 5I8 of Ho3+ ions. The evaluated photoluminescence and Raman spectroscopic results were discussed in detail. The upconversion intensity behavior dependent on the Yb/Ho ratio is explained in terms of the optimal number of Yb3+ ions at the characteristic energy transfer distance around the Ho3+ ion.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Grossman V. G., Bazarova J. G., Molokeev M. S., Bazarov B. G.
Заглавие : New triple molybdate K5ScHf(MoO4)6: Synthesis, properties, structure and phase equilibria in the M2MoO4–Sc2(MoO4)3–Hf(MoO4)2 (M = Li, K) systems
Место публикации : J. Solid State Chem. - 2020. - Vol. 283. - Ст.121143. - ISSN 00224596 (ISSN), DOI 10.1016/j.jssc.2019.121143
Примечания : Cited References: 53. - This study was carried out within the state assignment of FASO of Russia (Theme No 0339-2016-0007) as well was supported by RFBR Grants 18-08-00799 and 18-03-00557
Аннотация: Subsolidus phase relations in the M2MoO4–Sc2(MoO4)3–Hf(MoO4)2 (M = Li, K) systems have been studied by the method of “intersecting cuts”. No new triple molybdates have been identified in the Li2MoO4–Sc2(MoO4)3–Hf(MoO4)2 system and a new triple molybdate K5ScHf(MoO4)6 is formed in the K2MoO4–Sc2(MoO4)3–Hf(MoO4)2 system. The structure of K5ScHf(MoO4)6, have been determined in space group Rc through Rietveld analysis of X-ray powder diffraction data. The melting point of molybdate is 999 K. The compound has high ion conductivity (about 10−3 S cm−1).
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lim, Chang-Sung, Aleksandrovsky A. S., Molokeev M. S., Oreshonkov A. S., Atuchin V. V.
Заглавие : Structural and spectroscopic effects of Li+ substitution for Na+ in LixNa1-xCaGd0.5Ho0.05Yb0.45(MoO4)3 scheelite-type upconversion phosphors
Место публикации : Molecules. - 2021. - Vol. 26, Is. 23. - Ст.7357. - ISSN 1420-3049 (eISSN), DOI 10.3390/molecules26237357
Примечания : Cited References: 77. - This study was supported by the Research Program through the Campus Research Foundation funded by Hanseo University in 2021 (211Yunghap06)
Аннотация: A set of new triple molybdates, LixNa1-xCaGd0.5(MoO4)3:Ho3+0.05/Yb3+0.45, was successfully manufactured by the microwave-accompanied sol–gel-based process (MAS). Yellow molybdate phosphors LixNa1-xCaGd0.5(MoO4)3:Ho3+0.05/Yb3+0.45 with variation of the LixNa1-x (x = 0, 0.05, 0.1, 0.2, 0.3) ratio under constant doping amounts of Ho3+ = 0.05 and Yb3+ = 0.45 were obtained, and the effect of Li+ on their spectroscopic features was investigated. The crystal structures of LixNa1-xCaGd0.5(MoO4)3:Ho3+0.05/Yb3+0.45 (x = 0, 0.05, 0.1, 0.2, 0.3) at room temperature were determined in space group I41/a by Rietveld analysis. Pure NaCaGd0.5Ho0.05Yb0.45(MoO4)3 has a scheelite-type structure with cell parameters a = 5.2077 (2) and c = 11.3657 (5) Å, V = 308.24 (3) Å3, Z = 4. In Li-doped samples, big cation sites are occupied by a mixture of (Li,Na,Gd,Ho,Yb) ions, and this provides a linear cell volume decrease with increasing Li doping level. The evaluated upconversion (UC) behavior and Raman spectroscopic results of the phosphors are discussed in detail. Under excitation at 980 nm, the phosphors provide yellow color emission based on the 5S2/5F4 → 5I8 green emission and the 5F5 → 5I8 red emission. The incorporated Li+ ions gave rise to local symmetry distortion (LSD) around the cations in the substituted crystalline structure by the Ho3+ and Yb3+ ions, and they further affected the UC transition probabilities in triple molybdates LixNa1-xCaGd0.5(MoO4)3:Ho3+0.05/Yb3+0.45. The complex UC intensity dependence on the Li content is explained by the specificity of unit cell distortion in a disordered large ion system within the scheelite crystal structure. The Raman spectra of LixNa1-xCaGd0.5(MoO4)3 doped with Ho3+ and Yb3+ ions were totally superimposed with the luminescence signal of Ho3+ ions in the range of Mo–O stretching vibrations, and increasing the Li+ content resulted in a change in the Ho3+ multiplet intensity. The individual chromaticity points (ICP) for the LiNaCaGd(MoO4)3:Ho3+,Yb3+ phosphors correspond to the equal-energy point in the standard CIE (Commission Internationale de L’Eclairage) coordinates.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lim, Chang S., Aleksandrovsky A. S., Molokeev M. S., Oreshonkov A. S., Atuchin V.
Заглавие : Structural and spectroscopic effects of Li+ substitution for Na+ in LixNa1–xCaLa0.5Er0.05Yb0.45(MoO4)3 upconversion scheelite-type phosphors
Место публикации : Crystals. - 2023. - Vol. 13, Is. 2. - Ст.362. - ISSN 20734352 (eISSN), DOI 10.3390/cryst13020362
Примечания : Cited References: 63. - This study was funded by the Research Program through the Campus Research Foundation funded by Hanseo University in 2022 (2022046)
Аннотация: New triple molybdates LixNa1−xCaLa0.5(MoO4)3:Er3+0.05/Yb3+0.45 (x = 0, 0.05, 0.1, 0.2, 0.3) were manufactured successfully using the microwave-assisted sol-gel-based technique (MAS). Their room-temperature crystal structures were determined in space group I41/a by Rietveld analysis. The compounds were found to have a scheelite-type structure. In Li-substituted samples, the sites of big cations were occupied by a mixture of (Li, Na, La, Er, Yb) ions, which provided a linear cell volume decrease with the Li content increase. The increased upconversion (UC) efficiency and Raman spectroscopic properties of the phosphors were discussed in detail. The mechanism of optimization of upconversion luminescence upon Li content variation was shown to be due to the control of excitation/energy transfer channel, while the control of luminescence channels played a minor role. The UC luminescence maximized at lithium content x = 0.05. The mechanism of UC optimization was shown to be due to the control of excitation/energy transfer channel, while the control of luminescence channels played a minor role. Over the whole spectral range, the Raman spectra of LixNa1−xCaLa0.5(MoO4)3 doped with Er3+ and Yb3+ ions were totally superimposed with the luminescence signal of Er3+ ions, and increasing the Li+ content resulted in the difference of Er3+ multiple intensity. The density functional theory calculations with the account for the structural disorder in the system of Li, Na, Ca, La, Er and Yb ions revealed the bandgap variation from 3.99 to 4.137 eV due to the changing of Li content. It was found that the direct electronic transition energy was close to the indirect one for all compounds. The determined chromaticity points (ICP) of the LiNaCaLa(MoO4)3:Er3+,Yb3+ phosphors were in good relation to the equal-energy point in the standard CIE (Commission Internationale de L’Eclairage) coordinates.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Atuchin V. V., Aleksandrovsky A. S., Molokeev M. S., Krylov A. S., Oreshonkov A. S., Zhou D.
Заглавие : Structural and spectroscopic properties of self-activated monoclinic molybdate BaSm2(MoO4)4
Место публикации : J. Alloys Compd.: Elsevier, 2017. - Vol. 729. - P.843-849. - ISSN 09258388 (ISSN), DOI 10.1016/j.jallcom.2017.07.259
Примечания : Cited References: 60. - This work was supported by the National Natural Science Foundation of China (U1632146). The reported study was funded by RFBR according to the research projects 16-52-48010, 16-32-00351, 17-02-00920 and 17-52-53031. Also, the work was supported by (Act 211) the Government of the Russian Federation, contract 02.A03.21.0011, by Project № 0356-2015-0412 of SB RAS Program№II. 2P, and by the Ministry of Education and Science of the Russian Federation (4.1346.2017/PP).
Ключевые слова (''Своб.индексиров.''): coordination--crystal structure--luminescence--raman--sem--synthesis
Аннотация: The crystal structure of new monoclinic molybdate BaSm2(MoO4)4 is refined in monoclinic unit cell C2/m with cell parameters a = 5.29448 Å, b = 12.7232 Å, c = 19.3907 Å, β = 91.2812°, V = 1305.89 Å3. The crystal structure consists of the SmO8 square antiprism joined with each other by the edges forming a 2D layer perpendicular to the c-axis. MoO4 tetrahedra join SmO8 by nodes and also participate in layer formation, and Ba ions are located between these layers. The lattice dynamics is theoretically calculated on the base of the crystal structure data. The Raman spectra are recorded and analyzed in comparison with theoretical calculations. The discrepancy between the experimental and calculated Raman frequencies does not exceed 2 cm−1 for the most of Raman lines. The luminescence spectra of Sm3+ ions, which are positioned in the lowest local symmetry site C1, strongly differ from those detected for another molybdate crystal, β-RbSm(MoO4)2, with the C2 local symmetry. The 4G5/2 → 6H9/2 band is dominating in the BaSm2(MoO4)4 luminescence.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Grossman V., Atuchin V. V., Bazarov B. G., Aleksandrovsky A. S., Eremin E. V., Krylov A. S., Kuratieva N., Bazarova J. G., Maximov N., Molokeev M. S., Oreshonkov A. S., Pervukhina N., Shestakov N. P.
Заглавие : Structural, spectroscopic, electric and magnetic properties of new trigonal K5FeHf(MoO4)6 orthomolybdate
Место публикации : Molecules. - 2023. - Vol. 28, Is. 4. - Ст.1629. - ISSN 14203049 (eISSN), DOI 10.3390/molecules28041629
Примечания : Cited References: 82. - This work was supported by the state order of BINM SB RAS (0273-2021-0008), IIC (121031700318-8), ISP (FWGW-2022-0006) and the Russian Science Foundation (21-19-00046). The research was granted by the Government of the Russian Federation (075-15-2022-1132)
Аннотация: A new multicationic structurally disordered K5FeHf(MoO4)6 crystal belonging to the molybdate family is synthesized by the two-stage solid state reaction method. The characterization of the electronic and vibrational properties of the K5FeHf(MoO4)6 was performed using density functional theory calculations, group theory, Raman and infrared spectroscopy. The vibrational spectra are dominated by vibrations of the MoO4 tetrahedra, while the lattice modes are observed in a low-wavenumber part of the spectra. The experimental gap in the phonon spectra between 450 and 700 cm−1 is in a good agreement with the simulated phonon density of the states. K5FeHf(MoO4)6 is a paramagnetic down to 4.2 K. The negative Curie–Weiss temperature of −6.7 K indicates dominant antiferromagnetic interactions in the compound. The direct and indirect optical bandgaps of K5FeHf(MoO4)6 are 2.97 and 3.21 eV, respectively. The K5FeHf(MoO4)6 bandgap narrowing, with respect to the variety of known molybdates and the ab initio calculations, is explained by the presence of Mott-Hubbard optical excitation in the system of Fe3+ ions.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Klevtsov P. V., Glinskaya L. A., Klevtsova R. F., Aleksandrov K. S.
Заглавие : Synthesis and crystal structure analysis of binary molybdate CsNaMoO4В·2H2O
Место публикации : J. Struct. Chem. - 1997. - Vol. 38, Is. 4. - P.615-619. - ISSN 0022-4766
Аннотация: Single crystals of CsNaMoO4В·2H2O were synthesized, and the crystal structure of this compound was determined from X-ray diffraction data (SYNTEX P21 automatic diffractometer, MoK radiation, 2252 reflections, R = 0.037). Crystals are orthorhombic, space group P212121 with unit cell dimensions a = 6.379(1), b = 8.625(1), c = 13.671(2) A, Z = 4. The structure of the binary molybdate consists of continuous columns of face-sharing Na octahedra with attached MoO4 tetrahedra. The neighboring columns are linked by the Cs cations and the hydrogen bonds of the water molecules entering into the coordination polyhedra of the Na and Cs atoms.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Atuchin V. V., Bekenev V. L., Chimitova O. D., Molokeev M. S., Bazarov B. G., Bazarova J. G., Khuzhum O. Y., Lim C. S.
Заглавие : Synthesis and electronic properties of β-RbNd(MoO4)2
Место публикации : Asian J. Chem. - 2014. - Vol. 26, No. 5. - P.1284-1286. - ISSN 0970-7077, DOI 10.14233/ajchem.2014.17209
Примечания : Cited References: 26. - This study is partly supported by by the Ministry of Education and Science of the Russian Federation.
Предметные рубрики: UP-CONVERSION PHOTOLUMINESCENCE
VIBRATIONAL PROPERTIES
CRYSTAL-STRUCTURE
PARTICLES
MOLYBDATE
SPECTROSCOPY
SYSTEM
ER3+
Ключевые слова (''Своб.индексиров.''): β-rbnd(moo4)2--electronic structure--ab initio calculations--x-ray photoelectron spectroscopy
Аннотация: The electronic structure of β-RbNd(MoO4)2 has been evaluated from experimental and theoretical points of view. For the molybdate, X-ray photoelectron valence-band spectra have been measured. The total and partial densities of states of the constituent atoms of β-RbNd(MoO4)2 have been calculated using the FP-LAPW method. The FP-LAPW data reveal that main contributors in the valence-band region of β-RbNd(MoO4)2 are the Rb 4p-, Nd 4f-, Mo 4d- and O 2p-like states.
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18.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Atuchin V. V., Bazarov B. G., Chimitova O. D., Bekenev V. L., Khyzhun O. Yu., Bazarova Zh. G.
Заглавие : Synthesis and electronic structure of orthorhombic molybdate RbNd(MoO4)2
Коллективы : International Conference on the Physics of Optical Materials and Devices , Vinča Institute of Nuclear Sciences,, University of Belgrade, Laboratoire de Chimie de la Matière Condensée de Paris
Место публикации : The 3rd Int. Conf. on the Physics of Optical Materials and Devices. ICOM 2012: book of abstracts. - 2012. - P.209
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Atuchin V. V., Aleksandrovsky A. S., Chimitova O. D., Gavrilova T. A., Krylov A. S., Molokeev M. S., Oreshonkov A. S., Bazarov B. G., Bazarova J. G.
Заглавие : Synthesis and spectroscopic properties of monoclinic α-Eu2(MoO4)3
Коллективы : Ministry of Education and Science of the Russian Federation
Место публикации : J. Phys. Chem. C: American Chemical Society, 2014. - Vol. 118, Is. 28. - P.15404-15411. - ISSN 1932-7447, DOI 10.1021/jp5040739
Примечания : Cited References: 63. - This study is partly supported by the Ministry of Education and Science of the Russian Federation.
Предметные рубрики: RARE-EARTH MOLYBDATES
VIBRATIONAL PROPERTIES
LUMINESCENCE PROPERTIES
CRYSTAL-STRUCTURE
PHASE-TRANSITIONS
TRIPLE MOLYBDATE
SINGLE-CRYSTAL
X-RAY
PHOSPHORS
EUROPIUM
Аннотация: The microcrystals of monoclinic europium molybdate, alpha-Eu-2(MoO4)(3), have been fabricated by solid-state synthesis at T = 753-1273 K for 300 h. The crystal structure of alpha-Eu-2(MoO4)(3) has been refined by the Rietveld method and was found to belong to the space group C2/c with unit cell parameters a = 7.5576(1), b = 11.4709(2), c = 11.5158(2) angstrom, and beta = 109.278(1)degrees (R-B = 3.39%). About 40 narrow Raman lines have been observed in the Raman spectrum of the alpha-Eu-2(MoO4)(3) powder sample. The luminescence spectra of alpha-Eu-2(MoO4)(3) under excitation at 355 and 457.9 nm reveal domination of induced electric dipole transition D-5(0) - F-7(2) and the presence of ultranarrow lines at D-5(0) - F-7(0) and D-5(1) - F-7(0) transitions.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Atuchin V. V., Aleksandrovsky A. S., Chimitova O. D., Krylov A. S., Molokeev M. S., Bazarov B. G., Bazarova J. G., Xia, Zhiguo
Заглавие : Synthesis and spectroscopic properties of multiferroic β΄-Tb2(MoO4)3
Коллективы : International Workshop on Advanced Spectroscopy and Optical Materials (4th; 14–19 July 2013; Gdańsk, Poland)
Место публикации : Opt. Mater./ ed.: M. Grinberg, P. Bojarski, A. Suchocki: Elsevier Science, 2014. - Vol. 36, Is. 10. - P.1631–1635. - ISSN 0925-3467, DOI 10.1016/j.optmat.2013.12.008. - ISSN 1873-1252
Примечания : Cited References: 43. - This study was partly supported by SB RAS under Projects 28.13 and 24.31, and by the PSB RAS Project No. 3.9.5b, and RFBR Projects
Предметные рубрики: FERROELECTRIC-FERROELASTIC Tb2(MoO4)3
STIMULATED RAMAN-SCATTERING
TRANSITION-METAL MOLYBDATES
RARE-EARTH MOLYBDATES
CRYSTAL-STRUCTURE
VIBRATIONAL PROPERTIES
LUMINESCENCE PROPERTIES
Tb-2(MoO4)3 CRYSTALS
TERBIUM MOLYBDATE
PHASE-TRANSITIONS
Ключевые слова (''Своб.индексиров.''): terbium molybdate--raman spectrum--optical properties
Аннотация: Orthorhombic terbium molybdate, β΄-Tb2(MoO4)3, microcrystals have been fabricated by solid state synthesis at T = 750-1270 K for t = 290 h. The crystal structure β΄-Tb2(MoO4)3 has been refined by Rietveld method in space group Pba2 with cell parameters of a = 10.35387(6), b = 10.38413(6) and c = 10.65695(7) A (RB = 1.83%). About 40 narrow Raman lines have been observed in the Raman spectrum recorded for the β΄-Tb2(MoO4)3 powder sample. The luminescence spectrum of β΄-Tb2(MoO4)3 has been measured under the excitation at 355 nm, and the intensive photoluminescence band at 540-550 nm has been found. В© 2013 Elsevier Ltd. All rights reserved.
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