共查询到20条相似文献,搜索用时 578 毫秒
1.
M. G. Zuev 《Russian Journal of Inorganic Chemistry》2010,55(1):93-95
Solid-phase interactions in the V2O5-Ta2O5-MoO3 system were studied. The formation of com- pounds TaVO5 and VTa9O25 in the V2O5-Ta2O5 binary system was verified. Tetragonal VTa9O25-base solid solutions of the general formula Ta5 + 4x
V5 − 4x
O25 (x = 0.25–1) and TaVO5-base solid solutions of the general formula Ta
x
Mo1 − x
V2 − x
O8 − 3x
(x = 0.625–1) were found to form. Subsolidus phase equilibria in the V2O5-Ta2O5-MoO3 were determined. 相似文献
2.
The reactivity of SbVO5, a compound known since a short time, with T-Nb2O5 in solid state in air has been investigated over the whole component concentration range of a system built by these two reacting
substances. The investigation results have shown that an equimolar mixture of SbVO5 and T-Nb2O5 reacts with a subsequent formation of a hitherto unknown compound of the formula Nb2VSbO10. This compound has been characterized by the methods XRD, DTA/TG, and SEM. Its orthorhombic unit cell parameters have been
calculated, and its stability in air up to 880 ± 10 °C has been proved. At this temperature, the compound melts incongruently
with an accompanying deposition of solid Nb9VO25, i.e., of a compound that crystallizes in the binary oxide system V2O5–Nb2O5. 相似文献
3.
The results concerning the synthesis, structure and thermal properties of V2O5-MoO3-Ag2O samples in the vanadium rich region of ternary system are presented in the form of quasi-binary phase diagrams in which
at constant V2O5/MoO3 molar ratios, equal 9:1, 7:3 and 1:1, the content of Ag2O was variable. A new ternary phase isostructural with NaVMoO6 has been detected in the investigated system. 相似文献
4.
The results concerning the synthesis, structure and thermal properties of V2O5-MoO3-Ag2O samples in the molybdenum rich region of ternary system are presented in the form of quasi-binary systems: β-AgVO3-β-Ag2MoO4, AgVMoO6-MoO3, AgVMoO6-Ag2Mo4O13, AgVMoO6-Ag2Mo2O7, AgVMoO6-β-Ag2MoO4 and also of the system in which at V2O5/MoO3 molar ratio 3:7 the content of Ag2O was variable. The ternary phase AgVMoO6 was not described earlier in the literature. 相似文献
5.
Yu. V. Emel’yanova M. V. Morozova Z. A. Mikhailovskaya E. V. Velichko E. S. Buyanova V. M. Zhukovskii 《Russian Journal of Electrochemistry》2009,45(4):382-387
The results of studies of solid solutions with the overall composition of Bi4V2 ? x Ge x O11 ? δ and Bi4Ge3 ? x V x O12 + δ are presented. The process of phase formation are studied during the synthesis of solid solution using the ceramic method and through liquid precursors. Crystallochemical parameters of the obtained compounds are determined. The size distribution of the particles is studied. Conductivity of annealed of polycrystalline samples as a function of temperature and composition is studied using the impedance spectroscopy method. The shape of impedance complex plane plots of the samples obtained in different ways is studied and analyzed. 相似文献
6.
The paper summarizes the results concerning the different parts of the ternary system V2O5-MoO3-Ag2O and presents projection of the diagram on the basal triangle as well as its three-dimensional presentation of the diagram
drawn by the AutoCAD programme. 相似文献
7.
Z. A. Mikhailovskaya E. S. Buyanova S. A. Petrova M. V. Morozova R. G. Zakharov V. M. Zhukovskii 《Russian Journal of Inorganic Chemistry》2013,58(6):695-700
The existence boundaries, structures, and transport parameters of Bi1 ? x Co x [Bi12O14]Mo5O20 ± δ and Bi[Bi12O14]Mo5 ? y Co y O20 ± δ solid solutions, which have a unique columnar structure, were studied. Electrical conductivity in these solid solutions was studied by impedance spectroscopy. 相似文献
8.
Anna Blonska-Tabero 《Journal of Thermal Analysis and Calorimetry》2007,88(1):201-205
Thermal properties of Co2FeV3O11
have been reinvestigated. It has been proved that this compound does not exhibit
polymorphism. It melts incongruently at the temperature of 770±5°C
and the phase with lyonsite type structure is the solid product of this melting.
Phase relations in the whole subsolidus area of the CoO–V2O5–Fe2O3 system have been determined. The solidus area projection onto
the component concentration triangle plane of this system has been constructed
using the DTA and XRD methods. 15 subsidiary subsystems can be distinguished
in this system. 相似文献
9.
P. Tabero 《Journal of Thermal Analysis and Calorimetry》2007,88(1):37-41
Solid solution phases of a formula Fe8V10W16–xMoxO85 where 0≤x≤4, have been obtained, possessing a structure
of the compound Fe8V10W16O85.
It was found on the base of XRD and DTA investigations that these solution
phases melted incongruently, with increasing the value of x, in the temperature
range from 1108 (x=0) to 1083 K (x=4) depositing Fe2WO6
and WO3. The increase of the Mo6+
ions content in the crystal lattice of Fe8V10W16O85
causes the lattice parameters a=b contraction with cbeing
almost constant. IR spectra of the Fe8V10W16–xMoxO85 solid solution phases have been recorded. 相似文献
10.
Monika Bosacka 《Journal of Thermal Analysis and Calorimetry》2007,88(1):43-46
It has been demonstrated that Co2V2O7
and InVO4 react with each other forming a new compound
of the Co2InV3O11
formula, when their molar ratio is equal to 1:1, or among CoCO3,
In2O3 and V2O5,
mixed at a molar ratio of 4:1:3. This compound melts incongruently at the
temperature of 960±5°C, depositing crystals of InVO4.
It crystallizes in the triclinic system and the unit cell parameters amount
to: a=0.6524(6) nm, b=0.6885(5)
nm, c=1.0290(4) nm, α=96.5°, β=104.1°,
γ=100.9°, Z=2. The phase equilibria
being established in the Co2V2O7–InVO4
system over the whole components concentration range up to the solidus line
were described. 相似文献
11.
As a result of solid-state reactions three cadmium vanadates(V) have been obtained, i.e. CdV2O6, Cd2V2O7 and Cd4V2O9. Melting temperature and the product of melting has been determined for Cd4V2O9. Thermal properties of the obtained cadmium
vanadates(V) have been reinvestigated. The phase equilibria being established in the CdO-V2O5 system over the whole components concentration range up to the solidus line were described. 相似文献
12.
T. I. Krasnenko M. V. Rotermel’ S. A. Petrova R. G. Zakharov O. V. Sivtsova A. N. Chvanova 《Russian Journal of Inorganic Chemistry》2008,53(10):1641-1647
Phase relations in the Zn2V2O7-Cu2V2O7 system were studied by high-temperature X-ray diffraction and differential thermal analysis. The major phase constituents
of the system are solid solutions based on Zn2V2O7 and Cu2V2O7 polymorphs and their coexistence regions. The generation of α-Zn2 − 2x
Cu2x
V2O7 solid solution, where 0 ≤ x ≤ 0.30, leaves almost unchanged the stabilization temperature of the high-temperature zinc pyrovanadate phase. The α-Cu2 − 2x
Zn2x
V2O7 homogeneity range is 5 mol % Zn2V2O7. In the range 0.050 ≤ x ≤ 0.09 from 20 to ∼ 620°C, there is the two-phase field of α-Cu2V2O7 and β-Cu2V2O7 base solid solutions. At still higher temperatures, β-Zn2 − 2x
Cu2x
V2O7 and α-Cu2 − 2x
Zn2x
V2O7 coexist in the mixed-phase region. β-Zn2 − 2x
Cu2x
V2O7 solid solution, where 0 ≤ x ≤ 0.30, exists above 610 ± 5°C. The extent of the β′-Cu2V2O7-base solid solution is 9 to 65 mol % Zn2V2O7 at 615 ± 5°C, expanding to 0 mol % Zn2V2O7 with rising temperature.
Original Russian Text ¢ T.I. Krasnenko, M.V. Rotermel’, S.A. Petrova, R.G. Zakharov, O.V. Sivtsova, A.N. Chvanova, 2008, published
in Zhurnal Neorganicheskoi Khimii, 2008, Vol. 53, No. 10, pp. 1755–1762. 相似文献
13.
B. G. Golovkin 《Russian Journal of General Chemistry》2005,75(12):1857-1863
Gravimetry in combination with X-ray phase analysis, X-ray crystallography, and X-ray densitometry were used to determine the contents of V5+, V4+, and Ti4+ ions and vacancies in solid solutions formed by the reaction of V2O5 with TiO2 in air at atmospheric pressure. 相似文献
14.
A. Yu. Ledneva S. B. Artemkina P. A. Stabnikov L. V. Yanshole V. E. Fedorov 《Journal of Structural Chemistry》2017,58(4):758-762
A new Mo2O3(dpm)4 compound (I) is synthesized by the interaction of Mo(CO)6 with 2,2,6,6-tetramethylheptanedione-3,5 (dpm). The structure of complex I determined by the XRD method is as follows: triclinic crystal system, space group P–1, a = 10.1780(7) Å, b = 10.1817(6) Å, c = 13.3255(9) Å, α = 110.562(2)°, β = 102.233(2)°, γ = 93.9041(19)°, V = 1248.17(14) Å3. The compound is characterized by IR spectroscopy, mass-spectrometry and thermogravimetric analysis (TGA). 相似文献
15.
The title compound (disodium dipotassium copper(II) tris-[molybdate (VI)]) is prepared by form melt and characterized by single crystal X-ray diffraction and UV-vis spectroscopy. It crystallizes in the triclinic space group P-1 with a = 7.4946(8) Å, b = 9.3428(9) Å, c = 9.3619(9) Å, α = 92.591(7)°, β = 105.247(9)°, γ = 105.496(9)°, V = 604.7 Å3, and Z = 2. Its structure is isotypic with that of Na4Mn(MoO4)3. It is formed by Cu2O10 distorted bi-octahedral dimers linked by two bridging bidentate Mo2O4 tetrahedra and, additionally, two monodentate Mo1O4 tetrahedra to form Cu2Mo4O20 units. These units are linked by the insertion of Mo3O4 tetrahedra to build infinite ribbons disposed along the c axis. All of these ribbons form a one-dimensional framework. Both K1 and K3 cations are located in the inversion center, and all the other atoms are at general positions. The structure model is supported by the bond valence sum (BVS) and charge distribution CHARDI methods. The Cu2+ cations adopt the [4+2] CuO6 Jahn-Teller distortion giving rise to an intense d–d transition in the UV-vis absorption spectra. 相似文献
16.
Studies on thermal expansion of phases formed in the system Nb2O5-MoO3 (WO3) have been carried out in the high-temperature X-ray diffraction attachment. In the case of Nb14Mo3O44, Nb12MoO33 and Nb12WO33 the structure that consists of ReO3 type blocks, the direction of minimal thermal expansion is consistent with direction in which the chains of corner-sharing
polyhedra spread to infinity. On the contrary, for Nb2Mo3O14, the structure of which resembles the structure of tetragonal tungsten bronzes, the maximal thermal expansion direction is
consistent with above mentioned direction.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
17.
E. S. Buyanova O. S. Kaimieva A. N. Shatokhina M. V. Morozova Yu. V. Emel’yanova S. A. Petrova 《Russian Journal of Inorganic Chemistry》2016,61(4):470-476
Solid solutions Bi3Nb1–yWyO7 ± δ, Bi3Nb1–yVyO7 ± δ, Bi3Nb1–yFeyO7 ± δ (y = 0.1–0.5; Δy = 0.1), and Bi3–xYxNb1–yWyO7 ± δ (x = 0.05, 0.1; y = 0–0.3; Δy = 0.1) have been studied. The homogeneity ranges of the solid solutions and crystal-chemical parameters have been determined by means of X-ray powder diffraction. The electrical conductivity of sintered samples has been studied by impedance spectroscopy. The joint introduction of yttrium and tungsten into the niobium sublattice does not lead to an increase in the conductivity of solid solutions, and the change of the dopant type has no noticeable effect on this conductivity. 相似文献
18.
M. G. Zuev 《Russian Journal of Inorganic Chemistry》2007,52(3):424-426
The phase composition has been studied and an equilibrium phase diagram has been designed for the Al2O3-Li2O-R2O5 (R = Ta or Nb) systems in the subsolidus region up to 1000°C and 85 mol % Li2O. New phases with the composition Li1+x Al1?x O2?x , where x = 0–0.67, have been found. 相似文献
19.
A new molybdophosphate (NH4)8{Mo2VO4[(Mo2VIO6)CH3C(O)(PO3)2]2}·14H2O (1), has been synthesized by the reaction of {Mo2VO4(H2O)6}2+ fragments with 1-hydroxyethylidenediphosphonate (hedp HOC(CH3)(PO3H2)2), and it is characterized by 31P NMR, IR, UV, element analysis, TG and single-crystal X-ray analysis. The structure analysis reveals that the polyoxoanion
can be described as two {(Mo2VIO6)(CH3C(O)(PO3)2} units connected by a {Mo2VO4}2+ moiety. In the structure, the six Mo atoms are arranged into a new “W-shaped” structure, which represents a new kind of molybdophosphate. 相似文献
20.
L. P. Kozeeva M. Yu. Kamaneva A. I. Smolentsev V. S. Danilovich N. V. Podberezskaya 《Journal of Structural Chemistry》2008,49(6):1071-1076
Crystals of LuBaCo4O7+δ (114Lu) have been obtained by spontaneous crystallization of slowly cooled nonstoichiometric melt of the system Lu-Ba-Co-O. The crystals have been characterized by EDX microprobe and synchrotron radiation powder diffraction. Structure refinement has been carried out (automated diffractometer Bruker X8 APEX with a CCD detector, MoK α, graphite monochromator, ?max = 32.54°). Parameters of the hexagonal unit cell: space group P63 mc, a = 6.2601(1) Å c = 10.2017(3) Å V = 346.23(1) Å3, Z = 2, d calc = 6.331 g/cm3. Framework structure of the wurtzite type has been refined anisotropically to R-factor 0.0174. Charge balance in the compound and geometrical matching of structural fragments are discussed. 相似文献