13767-03-8Relevant articles and documents
Phase formation in the system involving silver, magnesium, and indium molybdates
Kotova,Korsun
, p. 1965 - 1969 (2010)
The subsolidus region of the Ag2MoO4-MgMoO 4-In2(MoO4)3 ternary salt system has been studied by X-ray powder diffraction. The formation of new compounds Ag1 - x Mg1 - x In1 + x (MoO4) 3 (0 ≤ x ≤ 0.6) and AgMg3In(MoO4) 5 has been established. The unit cell parameters of solid-solution samples have been determined. The Ag1 - x Mg1 - x In 1 + x (MoO4)3 phase of variable composition has a NASICON-type structure (space group R ?3c) AgMg3In(MoO 4)5 is isostructural to sodium magnesium indium molybdate of the same formula unit and crystallizes in triclinic system (space group P ?1, Z = 2) with the following unit cell parameters: a = 7.0374(5) ?, b = 17.932(1) ?, c = 6.9822(4) ?, α = 87.309(6)°, β = 100.832(6)°, γ = 92.358(6)°. The compounds Ag1 - x Mg1 - x In1 + x (MoO4)3 and AgMg3In(MoO4)5 are thermally stable up to 960 and 1030°C, respectively.
Ag1 - X Mg1 - X R1 + x (MoO 4)3 Ag+-conducting NASICON-like phases, where R = Al or Sc and 0 ≤ x ≤ 0.5
Kotova, I. Yu.,Belov,Stefanovich, S. Yu.
, p. 1189 - 1193 (2011)
Ag1 - x Mg1 - x R1 + x (MoO 4)3 NASICON-like solid solutions, where R = Al or Sc and 0 ≤ x ≤ 0.5, were prepared; their crystal lattice parameters and thermal stabilities were determined. Silver-ion co
Investigation of the first-order phase transition in the Co 1-xMgxMoO4 solid solution and discussion of the associated thermochromic behavior
Robertson,Gaudon,Jobic,Deniard,Demourgues
, p. 2878 - 2884 (2011)
A series of compounds of Co1-xMgxMoO4 compositions has been prepared by a conventional ceramic route. The members of the whole solid solution exhibit a reversible first-order phase transition which was probed by using thermal expansion and low-temperature reflectivity techniques. Whereas the α → β transition temperature evolves linearly on warming from 435 to 200 °C with x going from 0 to 0.9, the β → α transition temperature variation falls down on cooling from -40 °C to -140 °C going from CoMoO4 to Co 0.1Mg0.9MoO4 with an asymptotic evolution. The phase transition temperatures have been explained on the basis of a crystal polarization effect under substitution of Mg for Co. Thus, from an applicative point of view, new thermochromic pigments with tunable transition temperatures are here proposed.
NASICON phases of variable composition K1-x A1-x R1+x (MoO4)3 (0 ≤ x ≤ 0.2-0.6), where A = Ni, Mg, Co, or Mn and R = Yb, Lu, or Sc
Kozhevnikova,Khamaganova
, p. 800 - 804 (2008)
Phases of variable composition K1-x A1-x R 1+x (MoO4)3) (0 ≤ x ≤ 0.2-0.6), where A = Ni, Mg, Co, or Mn and R = Yb, Lu, or Sc, which crystallize in a NASICON-type structure (space group R 3?c) were synthesized by solid-phase reactions. Their crystal parameters were calculated, and IR and Raman spectra described.
Phase formation in the Ag2MoO4-MgMoO 4-Al2(MoO4)3 system
Kotova,Korsun
, p. 955 - 958 (2010)
The subsolidus region of the Ag2MoO4-MgMoO 4-Al2(MoO4)3 ternary salt system has been studied by X-ray phase analysis. The formation of new compounds Ag 1-xMg1-xAl1+x(MoO4)3 (0 ≥ x ≥ 0.4) and AgMg3Al(MoO4)5 has been determined. The Ag1-xMg1-xAl1 + x(MoO 4)3 variable-composition phase is related to the NASICON type structure (space group R 3? c). AgMg3Al(MoO 4)5 is isostructural to sodium magnesium indium molybdate of the same formula unit and crystallizes in triclinic system (space group P 1?, Z = 2) with the following unit cell parameters: α = 9.295(7) ?, b = 17.619(2) ?, c = 6.8570(7) ?, α = 87.420(9)°, β = 101.109(9)°,. = 91.847(9)°. The compounds Ag 1 - xMg1 - xAl1 + x(MoO4) 3 and AgMg3Al(MoO4)5 are thermally stable up to 790 and 820°C, respectively. Pleiades Publishing, Ltd., 2010.
Phase formation in Cs2MoO4-MMoO4- Zr(MoO4)2 (M = Mn, Mg, Co, Zn) systems and crystal structure of new double molybdates Cs2 MnZr2 (MoO 4)6 and Cs2 MnZr(MoO4)4
Tsyrenova,Solodovnikov,Pavlova,Solodovnikova
, p. 771 - 779 (2010)
Subsolidus phase relations in the Cs2MoO4-MMoO 4-Zr(MoO4)2 (M = Mn, Zn) ternary systems were determined, and two groups of new isostructural triple molybdates were synthesized: Cs2MZr(MoO4)4 and Cs 2MZr2(MoO4)6 (M = Mn, Mg, Co, Zn). Cs2MnZr2(MoO4)6 and Cs 2MnZr(MoO4)4 crystals were grown by spontaneous flux crystallization and used in structure solution for both groups of compounds. The Cs2MnZr2(MoO4)6 structure (a =13.4322(2) ?, c = 12.2016(3) ?, space group R3?, Z = 3, R = 0.0367) is a new structure type characterized by a mixed three-dimensional framework built of corner-sharing MoO4 tetrahedra and (M, Zr)O6 octahedra where large channels are occupied by cesium cations. Cs2MnZr2(MoO4)4 (a =5.3890(1) ?, c = 8.0685(3) ?, space group P3? m1, Z = 0.5, R = 0.0247) has the layered glaserite-like KAl(MoO4)2 type structure, where Al3+ octahedral positions are randomly occupied by a 0.5M2+ + 0.5Zr4+ mixture. Pleiades Publishing, Ltd., 2010.
Aqueous sol-gel synthesis and thermoanalytical study of the alkaline earth molybdate precursors
Braziulis, Gediminas,Janulevicius, Gytautas,Stankeviciute, Ruta,Zalga, Arturas
, p. 613 - 621 (2014)
The preparation and characterization of the M-Mo-O nitrate-tartrate (M = Mg, Ca, Sr, and Ba) gels, which were produced by the simple aqueous sol-gel method and calcined at 500, 600, 700, 800, 900, and 1,000 °C temperatures are reported. The crystalline al
Structural and texture evolution with temperature of layered double hydroxides intercalated with paramolybdate anions
Carriazo,Domingo,Martin,Rives
, p. 1243 - 1251 (2006)
Paramolybdate-LDHs with MgAl or ZnAl cations within the layers have been prepared by the ion-exchange method from hydrotalcites with different interlayer anions (OH-, NO3-, and terephthalate). The samples and the oxides obtained after their calcination were characterized by element chemical analysis, PXRD, FT-Raman spectroscopy, thermal analysis (TG/DTA), N2 adsorption at -196°C, and SEM. The results show that layered solids with hydrotalcite-type structure were obtained in which the interlayer space is occupied by heptamolybdate with a small amount of MoO 42- units formed through hydrolysis of the polyanion; both oxomolybdenum species undergo a progressive distortion of the octahedral units from 50°C but are roughly stable up to 250°C as a consequence of the interaction between the polyanion and the brucite-like layers. This distortion is responsible for the observed decrease in the height of the gallery for samples heated in the temperature range, 50-250°C, with respect to the original samples. Rehydration of the calcined solids allows recovering of their original structures and the initial values for the gallery heights. Calcination between 300 and 400°C gives rise to a collapse of the layered structure, and amorphous phases are formed, in which molybdenum is both octahedrally and tetrahedrally coordinated. Crystalline magnesium and zinc molybdates (MgMoO 4 and ZnMoO4) are formed at 450 and 600°C, respectively. All solids have some microporosity, which decreases with increasing the calcination temperature.
On the chemical vapour transport in the Mg/Mo/O system - Experiments and model calculations
Steiner, Udo,Reichelt, Werner
, p. 1632 - 1640 (2003)
Single crystals of MgMoO4 and Mg2Mo3O 8 have been obtained via chemical vapour transport in a temperature gradient 1273 to 1173 K using Cl2 and Br2 as transport agents. Pure powders of the ternary compounds have been used as starting materials as well as mixtures of three coexisting phases. The observed transport behaviour is compared with results of thermodynamical model calculations. The influence of source composition, transport agent and the moisture contents is described in detail.
MgMoO4as an anode material for lithium ion batteries and its multi-electron reaction mechanism
Duan, He,Zhou, Zhiyong,Zhao, Yanming,Dong, Youzhong
, p. 2493 - 2505 (2022/02/21)
Single-phase magnesium molybdate, MgMoO4, is successfully synthesized by a facile sol-gel method. Attributed to the multielectron reaction and the synergistic effect of the elements molybdenum (Mo) and magnesium (Mg), the MgMoO4 electrode exhibits excellent electrochemical properties. After activation, benefiting from the decrease in particle size and the uniform nanosphere morphology, the MgMoO4 electrodes can deliver a stable high specific capacity of about 1060 mA h g-1 at a current density of 100 mA g-1 after 600 cycles. Based on the important role of the activation process, electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM) and scan rate cyclic voltammetry (CV) measurement methods were employed to reveal the effect of the activation process on the electrochemical behavior of the electrode material. Furthermore, by combining the in situ X-ray diffraction (XRD) and ex situ X-ray photoelectron spectroscopy (XPS) results, we illustrate the lithium storage mechanism of the MgMoO4 electrode in detail.
