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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Atuchin V. V., Chimitova O. D., Gavrilova T. A., Molokeev M. S., Kim S. J., Surovtsev N. V., Bazarov B. G., Bazarova Zh.G.
Заглавие : Synthesis, structural and vibrational properties of microcrystalline RbNd(MoO4)(2)
Коллективы : International Conference on Crystal Growth, International Conference on Vapor Growth and Epitaxy
Место публикации : J. Cryst. Growth: Elsevier Science BV, 2011. - Vol. 318, Is. 1. - P.683-686. - ISSN 0022-0248, DOI 10.1016/j.jcrysgro.2010.09.076
Примечания : Cited References: 26
Предметные рубрики: MOLYBDENUM TRIOXIDE
DOUBLE MOLYBDATES
CRYSTAL-STRUCTURE
GROWTH
LASER
MOO3
Ключевые слова (''Своб.индексиров.''): crystal structure--solid state synthesis--molybdate
Аннотация: Rubidium neodymium dimolybdate, RbNd(MoO4)(2), microcrystals have been fabricated by solid state synthesis at T=550-600 degrees C by t=324 ks. Crystal structure of RbNd(MoO4)(2) has been refined by Rietveld method in space group Pbcn with cell parameters a = 5.1772(1) angstrom, b = 18.7293(4) angstrom, and c = 8.2774(1) angstrom (R-B=5.05%). The crystal structure of RbNd(MoO4)(2) consists of layers of MoO4 tetrahedrons cornersharing with NdO8 square antiprisms. These layers are perpendicular to b-axis of the unit cell. About 20 narrow Raman lines have been observed in Raman spectrum recorded for RbNd(MoO4)(2) powder sample. (C) 2010 Elsevier B.V. All rights reserved.
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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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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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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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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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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) : 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
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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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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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Savina A. A., Atuchin V. V., Solodovnikov S. F., Solodovnikova Z. A., Krylov A. S., Maximovsky E. A., Molokeev M. S., Oreshonkov A. S., Pugachev A. M., Khaikina E. G.
Заглавие : Synthesis, structural and spectroscopic properties of acentric triple molybdate Cs2NaBi(MoO4)3
Коллективы : Russian Foundation for Basic Research [4828.2012.2, 12-02-31205]; Federal Special Program "Scientific and scientific-pedagogical staff of innovative Russia" [8379]
Место публикации : J. Solid State Chem. - 2015. - Vol. 225. - P.53–58. - ISSN 0022-4596, DOI 10.1016/j.jssc.2014.11.023. - ISSN 1095-726X
Примечания : Cited References: 66. - The authors are grateful to Dr. K.M. Khal'baeva and Dr. Irina A. Gudkova for their assistance in preparing the compound and taking X-ray single-crystal diffraction data. This study is partly supported by the Russian Foundation for Basic Research (Grants 13-03-01020 and 14-03-00298). V.V.A., A.S.K. and A.S.O. gratefully acknowledge the Ministry of Education and Science of the Russian Federation for a partial financial support.
Предметные рубрики: CRYSTAL-STRUCTURE
SINGLE-CRYSTALS
VIBRATIONAL PROPERTIES
RAMAN-SPECTROSCOPY
HYDROTHERMAL SYNTHESIS
DIELECTRIC-PROPERTIES
SELECTIVE OXIDATION;
BISMUTH MOLYBDATES
IONIC-CONDUCTIVITY
OPTICAL-PROPERTIES
Ключевые слова (''Своб.индексиров.''): triple molybdate--sodium--cesium--bismuth--crystal structure--raman spectroscopy--crystal-structure--single-crystals--vibrational properties--raman-spectroscopy--hydrothermal synthesis--dielectric-properties--selective oxidation;--bismuth molybdates--ionic-conductivity--optical-properties
Аннотация: New ternary molybdate Cs2NaBi(MoO4)3 is synthesized in the system Na2MoO4–Cs2MoO4–Bi2(MoO4)3. The structure of Cs2NaBi(MoO4)3 of a new type is determined in noncentrosymmetric space group R3c, a=10.6435(2), c=40.9524(7) Å, V=4017.71(13) Å3, Z=12 in anisotropic approximation for all atoms taking into account racemic twinning. The structure is completely ordered, Mo atoms are tetrahedrally coordinated, Bi(1) and Bi(2) atoms are in octahedra, and Na(1) and Na(2) atoms have a distorted trigonal prismatic coordination. The Cs(1) and Cs(2) atoms are in the framework cavities with coordination numbers 12 and 10, respectively. No phase transitions were found in Cs2NaBi(MoO4)3 up to the melting point at 826 K. The compound shows an SHG signal, I2w/I2w(SiO2)=5 estimated by the powder method. The vibrational properties are evaluated by Raman spectroscopy, and 26 narrow lines are measured.
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11.

Вид документа : Статья из журнала
Шифр издания :
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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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lim C. S., Aleksandrovsky A. S., Molokeev M. S., Oreshonkov A. S., Ikonnikov D. A., Atuchin V. V.
Заглавие : Triple molybdate scheelite-type upconversion phosphor NaCaLa(MoO4)3:Er3+/Yb3+: Structural and spectroscopic properties
Место публикации : Dalton Trans.: Royal Society of Chemistry, 2016. - Vol. 45, Is. 39. - P.15541-15551. - ISSN 14779226 (ISSN), DOI 10.1039/c6dt02378a
Примечания : Cited References: 71
Ключевые слова (''Своб.индексиров.''): light emission--optical properties--phosphors--sol-gel process--sol-gels--tungstate minerals--after-heat treatment--crystallized particles--homogeneous morphology--photoluminescence emission--spectroscopic property--triple molybdates--up-conversion emission--upconversion phosphors--optical emission spectroscopy
Аннотация: Triple molybdate NaCaLa(1-x-y)(MoO4)3:xEr3+,yYb3+ (x = y = 0, x = 0.05 and y = 0.45, x = 0.1 and y = 0.2, x = 0.2 and y = 0) phosphors were successfully synthesized for the first time by the microwave sol-gel method. Well-crystallized particles formed after heat treatment at 900 °C for 16 h showed a fine and homogeneous morphology with particle sizes of 2-3 ?m. The structures were refined by the Rietveld method in the space group I41/a. The optical properties were examined comparatively using photoluminescence emission and Raman spectroscopy. Under excitation at 980 nm, the NaCaLa0.7(MoO4)3:0.1Er3+,0.2Yb3+ and NaCaLa0.5(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 three 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. © 2016 The Royal Society of Chemistry.
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13.

Вид документа : Статья из журнала
Шифр издания :
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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14.

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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15.

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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16.

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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17.

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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18.

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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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Grossman, Victoria G., Bazarova J. G., Molokeev M. S., Bazarov B. G.
Заглавие : Thallium ionic conductivity of new thallium indium hafnium molybdate ceramics
Коллективы : RFBRRussian Foundation for Basic Research (RFBR) [0339-2016-0007]; [18-08-00799]; [18-03-00557]
Место публикации : Ionics. - 2020. - Vol. 26. - P.6157-6165. - ISSN 0947-7047, DOI 10.1007/s11581-020-03739-7. - ISSN 1862-0760(eISSN)
Примечания : Cited References: 60. - 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
Предметные рубрики: POSITIVE ELECTRODE MATERIAL
CRYSTAL-STRUCTURE
TRIPLE MOLYBDATE
Аннотация: In the process of studying the system Tl2MoO4–In2(MoO4)3–Hf(MoO4)2, a new thallium indium hafnium molybdate was found. The crystal structure of the molybdate Tl5InHf(MoO4)6 was determined in the centrosymmetric space group R3¯c (a = 10.63893 (5) Å, c = 38.1447(3) Å; V = 3739.04 (4) Å3, Z = 6). The structure is a three-dimensional framework consisting of alternating (Hf,In)O6-octahedra connected by МоО4-tetrahedra. Each octahedron has common vertices with tetrahedra. The atoms arranged in this way form channels extended along with the a and b axes, in which thallium atoms are located. The conductivity behavior of Tl5InHf(MoO4)6 ceramics was studied in the temperature range from 300 to 870 K. The conductivity of the heavy cations of thallium is activated with increasing temperature.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Yun, Xiangyan, Zhou, Jun, Zhu, Yaohui, Molokeev M. S., Jia, Yetong, Wei, Chao, Xu, Denghui, Sun, Jiayue
Заглавие : Thermometry and up-conversion luminescence of Ln3+ (Ln = Er, Ho, Tm)-doped double molybdate LiYbMo2O8
Место публикации : J. Mater. Sci.: Mater. Electron. - 2020. - Vol. 31, Is. 21. - P.18370-18380. - ISSN 0957-4522, DOI 10.1007/s10854-020-04382-8. - ISSN 1573-482X(eISSN)
Примечания : Cited References: 41. - This work is supported by the National Natural Science Foundation of China (No. 21576002 and 61705003) and Beijing Technology and Business University Research Team Construction Project (No. PXM2019_014213_000007)
Предметные рубрики: TEMPERATURE SENSING BEHAVIOR
OPTICAL THERMOMETRY
EMISSION
PHOSPHOR
Аннотация: The discovery of stable and highly sensitive up-conversion (UC) phosphors using the fluorescence intensity ratio (FIR) is a significant challenge in the field of optical temperature sensor. Er3+/Ho3+/Tm3+-doped LiYbMo2O8 UC phosphors with excellent luminescence properties were successfully synthesized through a high-temperature solid-state reaction, and the crystal structure and UC luminescence properties were discussed in detail. The UC process has been investigated by spectra pump power dependence and further explained via the energy level diagram. All emission processes about Er3+ ions and Ho3+ ions are two-photon processes and the blue emission process about Tm3+ ions is a combination of two-photon process and three-photon process. Thermal sensing performances depended on FIR technology were estimated and the sensitivities of LiYb1−xMo2O8:xLn3+ included absolute sensitivity (Sa) and relative sensitivity (Sr) can produce particular change rules with the temperature, which can serve as excellent candidates for applications in optical temperature sensing. With the increase of temperature, the maximum values of Sr of LiYb1−xMo2O8:xLn3+ are 1.16% K−1 (0.05Er3+), 0.25% K−1 (0.01Ho3+), and 0.51% K−1 (0.01Tm3+), respectively. In addition, the Sa value of LiYb0.95Mo2O8:0.05Er3+ phosphor will reach the maximum (1.08% K−1) at 475 K, while the maximum values of Sa of LiYb0.99Mo2O8:0.01Ho3+ and LiYb0.99Mo2O8:0.01Tm3+ are 0.16% K−1, 0.14% K−1.
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