The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform
Evgeny V Alekseev - One of the best experts on this subject based on the ideXlab platform.
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High-Temperature Phase Transitions, Spectroscopic Properties, and Dimensionality Reduction in Rubidium Thorium Molybdate Family
2016Co-Authors: Bin Xiao, Evgeny V Suleimanov, Thorsten M Gesing, Philip Kegler, Giuseppe Modolo, Dirk Bosbach, Hartmut Schlenz, Evgeny V AlekseevAbstract:Four new rubidium thorium Molybdates have been synthesized by high-temperature solid-state reactions. The crystal structures of Rb8Th(MoO4)6, Rb2Th(MoO4)3, Rb4Th(MoO4)4, and Rb4Th5(MoO4)12 were determined using single-crystal X-ray diffraction. All these compounds construct from MoO4 tetrahedra and ThO8 square antiprisms. The studied compounds adopt the whole range of possible structure dimensionalities from zero-dimensional (0D) to three-dimensional (3D): finite clusters, chains, sheets, and frameworks. Rb8Th(MoO4)6 crystallizes in 0D containing clusters of [Th(MoO4)6]8–. The crystal structure of Rb2Th(MoO4)3 is based upon one-dimensional chains with configuration units of [Th(MoO4)3]2–. Two-dimensional sheets occur in compound Rb4Th(MoO4)4, and a 3D framework with channels formed by thorium and Molybdate polyhedra has been observed in Rb4Th5(MoO4)12. The Raman and IR spectroscopic properties of these compounds are reported. Temperature-depended phase transition effects were observed in Rb2Th(MoO4)3 and Rb4Th(MoO4)4 using thermogravimetry-differential scanning calorimetry analysis and high-temperature powder diffraction methods
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high temperature phase transitions spectroscopic properties and dimensionality reduction in rubidium thorium Molybdate family
Inorganic Chemistry, 2014Co-Authors: Bin Xiao, Evgeny V Suleimanov, Thorsten M Gesing, Philip Kegler, Giuseppe Modolo, Dirk Bosbach, Hartmut Schlenz, Evgeny V AlekseevAbstract:Four new rubidium thorium Molybdates have been synthesized by high-temperature solid-state reactions. The crystal structures of Rb8Th(MoO4)6 ,R b 2Th(MoO4)3, Rb4Th(MoO4)4, and Rb4Th5(MoO4)12 were determined using single-crystal X-ray diffraction. All these compounds construct from MoO4 tetrahedra and ThO8 square antiprisms. The studied compounds adopt the whole range of possible structure dimensionalities from zero-dimensional (0D) to three-dimensional (3D): finite clusters, chains, sheets, and frameworks. Rb8Th(MoO4)6 crystallizes in 0D containing clusters of (Th(MoO4)6) 8− . The crystal structure of Rb2Th(MoO4)3 is based upon one-dimensional chains with configuration units of (Th(MoO4)3) 2− . Two-dimensional sheets occur in compound Rb4Th(MoO4)4, and a 3D framework with channels formed by thorium and Molybdate polyhedra has been observed in Rb4Th5(MoO4)12. The Raman and IR spectroscopic properties of these compounds are reported. Temperature-depended phase transition effects were observed in Rb2Th(MoO4)3 and Rb4Th(MoO4)4 using thermogravimetry-differential scanning calorimetry analysis and high-temperature powder diffraction methods.
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dimensional reduction in alkali metal uranyl Molybdates synthesis and structure of cs2 uo2 o moo4
Zeitschrift für anorganische und allgemeine Chemie, 2007Co-Authors: Evgeny V Alekseev, Sergey V Krivovichev, Thomas Armbruster, Wulf Depmeier, Evgeny V Suleimanov, Evgeny V Chuprunov, Alexei V GolubevAbstract:A new uranyl Molybdate, Cs-2[(UO2)O(MoO4)] (1), has been prepared by high-temperature solid-state reactions. The structure has been solved by direct methods and refined to R-1 = 0.0284 for vertical bar F-0 vertical bar >= 4 sigma(F) The compound 1 is orthorhombic, Pca2(1), a = 12.018(2), b = 12.438(2), c = 17.917(3) angstrom, V = 2678.2(7) angstrom(3), Z = 12. The structure of 1 is based upon one-dimensional chains consisting of corner-sharing UO6 and MoO4 polyhedra. The UO6 square bipyramids share cis equatorial vertices to form zigzag chains that are further stabilized by bidendate MoO4 tetrahedra. The chains have composition [(UO2)O(MoO4)](2-) and are oriented parallel to the c axis. In the structure, adjacent chains form pseudo-2D-layers parallel to (010). The Cs+ cations are in between the pseudolayers. The composition -structure relationships in alkali metal uranyl Molybdates can be rationalized from the viewpoint of dimensional reduction using the following assumptions: (1) representation of the A(x)U(n)Mo(m)O(y) formula (n <= m) as a sum of UMoO6 (= UO2MoO4), A(2)O, and A(2)MoO(4) (A = alkali metal): A(x)U(n)Mo(m)O(y) = kA(2)O + nUMoO(6) + (m-n)A(2)MoO(4), where x = 2(k + m - n) and y = k + 2n + 4m; (2) analysis of the dimensionality of uranyl Molybdate structural units and its changes upon incorporation of ionic reagents A(2)O and A(2)MoO(4) into a parent framework Of UO2MoO4 that consists of 3-D array of U and Mo based polyhedra. The relationships between different compositions and structures may be visualized using the UO2MoO4-A(2)O-A(2)MoO(4) compositional diagram. The observed trends of decreasing dimensionality of the uranyl Molybdate units allow to specify on this diagram fields of dimensionality.
Bin Xiao - One of the best experts on this subject based on the ideXlab platform.
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High-Temperature Phase Transitions, Spectroscopic Properties, and Dimensionality Reduction in Rubidium Thorium Molybdate Family
2016Co-Authors: Bin Xiao, Evgeny V Suleimanov, Thorsten M Gesing, Philip Kegler, Giuseppe Modolo, Dirk Bosbach, Hartmut Schlenz, Evgeny V AlekseevAbstract:Four new rubidium thorium Molybdates have been synthesized by high-temperature solid-state reactions. The crystal structures of Rb8Th(MoO4)6, Rb2Th(MoO4)3, Rb4Th(MoO4)4, and Rb4Th5(MoO4)12 were determined using single-crystal X-ray diffraction. All these compounds construct from MoO4 tetrahedra and ThO8 square antiprisms. The studied compounds adopt the whole range of possible structure dimensionalities from zero-dimensional (0D) to three-dimensional (3D): finite clusters, chains, sheets, and frameworks. Rb8Th(MoO4)6 crystallizes in 0D containing clusters of [Th(MoO4)6]8–. The crystal structure of Rb2Th(MoO4)3 is based upon one-dimensional chains with configuration units of [Th(MoO4)3]2–. Two-dimensional sheets occur in compound Rb4Th(MoO4)4, and a 3D framework with channels formed by thorium and Molybdate polyhedra has been observed in Rb4Th5(MoO4)12. The Raman and IR spectroscopic properties of these compounds are reported. Temperature-depended phase transition effects were observed in Rb2Th(MoO4)3 and Rb4Th(MoO4)4 using thermogravimetry-differential scanning calorimetry analysis and high-temperature powder diffraction methods
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high temperature phase transitions spectroscopic properties and dimensionality reduction in rubidium thorium Molybdate family
Inorganic Chemistry, 2014Co-Authors: Bin Xiao, Evgeny V Suleimanov, Thorsten M Gesing, Philip Kegler, Giuseppe Modolo, Dirk Bosbach, Hartmut Schlenz, Evgeny V AlekseevAbstract:Four new rubidium thorium Molybdates have been synthesized by high-temperature solid-state reactions. The crystal structures of Rb8Th(MoO4)6 ,R b 2Th(MoO4)3, Rb4Th(MoO4)4, and Rb4Th5(MoO4)12 were determined using single-crystal X-ray diffraction. All these compounds construct from MoO4 tetrahedra and ThO8 square antiprisms. The studied compounds adopt the whole range of possible structure dimensionalities from zero-dimensional (0D) to three-dimensional (3D): finite clusters, chains, sheets, and frameworks. Rb8Th(MoO4)6 crystallizes in 0D containing clusters of (Th(MoO4)6) 8− . The crystal structure of Rb2Th(MoO4)3 is based upon one-dimensional chains with configuration units of (Th(MoO4)3) 2− . Two-dimensional sheets occur in compound Rb4Th(MoO4)4, and a 3D framework with channels formed by thorium and Molybdate polyhedra has been observed in Rb4Th5(MoO4)12. The Raman and IR spectroscopic properties of these compounds are reported. Temperature-depended phase transition effects were observed in Rb2Th(MoO4)3 and Rb4Th(MoO4)4 using thermogravimetry-differential scanning calorimetry analysis and high-temperature powder diffraction methods.
D S Kharitonov - One of the best experts on this subject based on the ideXlab platform.
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surface and corrosion properties of aa6063 t5 aluminium alloy in Molybdate containing sodium chloride solutions
Corrosion Science, 2020Co-Authors: D S Kharitonov, Illia Dobryden, Birhan Sefer, Angelika Wrzesinska, Irina V Makarova, Izabela Bobowska, I I Kurilo, Per M ClaessonAbstract:Abstract Corrosion properties of aluminium alloy AA6063-T5 were investigated in Molybdate-containing NaCl solutions. Electrochemical, microscopic, and spectroscopic experiments were utilized to examine the mechanism of corrosion inhibition by Molybdates. SEM-EDX, magnetic force, and intermodulation electrostatic force microscopy data suggested that the inhibition initiation preferentially occurred over Fe-rich cathodic IMPs. Spectroscopic measurements demonstrated that the formed surface layer consists of mixed Mo(VI, V, IV) species. This layer provided inhibition with an efficiency of ∼90% after 4 h of exposure. High efficacy of ∼70% was achieved even after one week of exposure. A two-step oxidation-reduction mechanism of corrosion inhibition by aqueous Molybdates was proposed.
Alekseev Evgeny - One of the best experts on this subject based on the ideXlab platform.
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The Structural Effects of Alkaline- and Rare-Earth Elements Incorporation into the Thorium Molybdates
RSC, 2016Co-Authors: Xiao Bin, Schlenz Hartmut, Bosbach Dirk, Suleimanov Evgeny, Alekseev EvgenyAbstract:Four novel thorium Molybdates containing alkaline-earth or rare-earth metals were isolated from high-temperature solid-state synthesis. The incorporation of divalent and trivalent cations into the thorium Molybdate system results in complex structural topologies. A2MgTh3(MoO4)8 (A = K, Rb) which crystallizes in the space group C2/c is the first instance among the thorium Molybdate family that incorporates alkaline-earth metals. Its crystal structure is based on complex channels composed of ThO8 square antiprisms and MoO4 tetrahedra arranged in a corner-sharing manner. K2SrTh2(MoO4)6, as the first thorium polyMolybdate compound, is constructed from ThO8 square antiprisms and Mo4O16 tetramers. The Mo4O16 tetramers, lying in the (001) plane, are built from four edge-sharing MoO6 octahedra. Nd2Th3(MoO4)9 is the first thorium Molybdate containing rare-earth cations. The resemblance of Nd2Th3(MoO4)9 with hexagonal-ThMo2O8 reveals its potential as a host for different trivalent transuranium elements. Raman spectra analysis shows that the different Mo polyhedral geometries (MoO4 tetrahedra and MoO6 octahedra) have significant effects on the vibrational bands of these compounds. The thermal behavior and stability of the newly obtained materials have been studied
Evgeny V Suleimanov - One of the best experts on this subject based on the ideXlab platform.
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High-Temperature Phase Transitions, Spectroscopic Properties, and Dimensionality Reduction in Rubidium Thorium Molybdate Family
2016Co-Authors: Bin Xiao, Evgeny V Suleimanov, Thorsten M Gesing, Philip Kegler, Giuseppe Modolo, Dirk Bosbach, Hartmut Schlenz, Evgeny V AlekseevAbstract:Four new rubidium thorium Molybdates have been synthesized by high-temperature solid-state reactions. The crystal structures of Rb8Th(MoO4)6, Rb2Th(MoO4)3, Rb4Th(MoO4)4, and Rb4Th5(MoO4)12 were determined using single-crystal X-ray diffraction. All these compounds construct from MoO4 tetrahedra and ThO8 square antiprisms. The studied compounds adopt the whole range of possible structure dimensionalities from zero-dimensional (0D) to three-dimensional (3D): finite clusters, chains, sheets, and frameworks. Rb8Th(MoO4)6 crystallizes in 0D containing clusters of [Th(MoO4)6]8–. The crystal structure of Rb2Th(MoO4)3 is based upon one-dimensional chains with configuration units of [Th(MoO4)3]2–. Two-dimensional sheets occur in compound Rb4Th(MoO4)4, and a 3D framework with channels formed by thorium and Molybdate polyhedra has been observed in Rb4Th5(MoO4)12. The Raman and IR spectroscopic properties of these compounds are reported. Temperature-depended phase transition effects were observed in Rb2Th(MoO4)3 and Rb4Th(MoO4)4 using thermogravimetry-differential scanning calorimetry analysis and high-temperature powder diffraction methods
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high temperature phase transitions spectroscopic properties and dimensionality reduction in rubidium thorium Molybdate family
Inorganic Chemistry, 2014Co-Authors: Bin Xiao, Evgeny V Suleimanov, Thorsten M Gesing, Philip Kegler, Giuseppe Modolo, Dirk Bosbach, Hartmut Schlenz, Evgeny V AlekseevAbstract:Four new rubidium thorium Molybdates have been synthesized by high-temperature solid-state reactions. The crystal structures of Rb8Th(MoO4)6 ,R b 2Th(MoO4)3, Rb4Th(MoO4)4, and Rb4Th5(MoO4)12 were determined using single-crystal X-ray diffraction. All these compounds construct from MoO4 tetrahedra and ThO8 square antiprisms. The studied compounds adopt the whole range of possible structure dimensionalities from zero-dimensional (0D) to three-dimensional (3D): finite clusters, chains, sheets, and frameworks. Rb8Th(MoO4)6 crystallizes in 0D containing clusters of (Th(MoO4)6) 8− . The crystal structure of Rb2Th(MoO4)3 is based upon one-dimensional chains with configuration units of (Th(MoO4)3) 2− . Two-dimensional sheets occur in compound Rb4Th(MoO4)4, and a 3D framework with channels formed by thorium and Molybdate polyhedra has been observed in Rb4Th5(MoO4)12. The Raman and IR spectroscopic properties of these compounds are reported. Temperature-depended phase transition effects were observed in Rb2Th(MoO4)3 and Rb4Th(MoO4)4 using thermogravimetry-differential scanning calorimetry analysis and high-temperature powder diffraction methods.
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dimensional reduction in alkali metal uranyl Molybdates synthesis and structure of cs2 uo2 o moo4
Zeitschrift für anorganische und allgemeine Chemie, 2007Co-Authors: Evgeny V Alekseev, Sergey V Krivovichev, Thomas Armbruster, Wulf Depmeier, Evgeny V Suleimanov, Evgeny V Chuprunov, Alexei V GolubevAbstract:A new uranyl Molybdate, Cs-2[(UO2)O(MoO4)] (1), has been prepared by high-temperature solid-state reactions. The structure has been solved by direct methods and refined to R-1 = 0.0284 for vertical bar F-0 vertical bar >= 4 sigma(F) The compound 1 is orthorhombic, Pca2(1), a = 12.018(2), b = 12.438(2), c = 17.917(3) angstrom, V = 2678.2(7) angstrom(3), Z = 12. The structure of 1 is based upon one-dimensional chains consisting of corner-sharing UO6 and MoO4 polyhedra. The UO6 square bipyramids share cis equatorial vertices to form zigzag chains that are further stabilized by bidendate MoO4 tetrahedra. The chains have composition [(UO2)O(MoO4)](2-) and are oriented parallel to the c axis. In the structure, adjacent chains form pseudo-2D-layers parallel to (010). The Cs+ cations are in between the pseudolayers. The composition -structure relationships in alkali metal uranyl Molybdates can be rationalized from the viewpoint of dimensional reduction using the following assumptions: (1) representation of the A(x)U(n)Mo(m)O(y) formula (n <= m) as a sum of UMoO6 (= UO2MoO4), A(2)O, and A(2)MoO(4) (A = alkali metal): A(x)U(n)Mo(m)O(y) = kA(2)O + nUMoO(6) + (m-n)A(2)MoO(4), where x = 2(k + m - n) and y = k + 2n + 4m; (2) analysis of the dimensionality of uranyl Molybdate structural units and its changes upon incorporation of ionic reagents A(2)O and A(2)MoO(4) into a parent framework Of UO2MoO4 that consists of 3-D array of U and Mo based polyhedra. The relationships between different compositions and structures may be visualized using the UO2MoO4-A(2)O-A(2)MoO(4) compositional diagram. The observed trends of decreasing dimensionality of the uranyl Molybdate units allow to specify on this diagram fields of dimensionality.