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1.
The phosphides (Ni1 ? x Co x )2P (0 ≤ x ≤ 0.65) crystallizing in the hexagonal system, space group P \(\bar 6\)2m, were synthesized in two steps starting from the continuous solid solution (Ni1 ? x Co x )3(PO4)2 · 8H2O. The initial phosphates were first completely dehydrated at 800°C and then reduced with hydrogen at 900–1000°C for 1–2 h. 相似文献
2.
M. I. Pantyukhina M. S. Shchelkanova S. V. Plaksin 《Russian Journal of Electrochemistry》2010,46(7):780-783
A boundary of existence of solid solutions in the Li8−2x
Mg
x
ZrO6 system is found to be 7 mol % MgO. The transport properties of Li8 − 2x
Mg
x
ZrO6 solid solutions (the electronic component of total conductivity, the temperature and concentration dependences of conductivity
and activation energy) are studied. It is supposed that, for Li8ZrO6 phase and solid solution based on it, an abrupt change of conductivity in the temperature range from 663 to 713 K is caused
by the transition of electrolyte into the superionic state. 相似文献
3.
Petra Šulcová Lucie Vitásková Miroslav Trojan 《Journal of Thermal Analysis and Calorimetry》2010,99(2):409-413
Compounds based on CeO2 were synthesized as high-temperature environment-friendly inorganic pigments with interesting hues. The pigments have been
synthesized by using the solid state reaction in the temperature range from 1,300 to 1,600 °C. The host lattice of these pigments
is CeO2 that is doped by terbium ions. The incorporation of doped ions provides interesting orange colours after application into
ceramic glaze. The goal was to develop conditions for the synthesis of these compounds and to determine the influence of calcination
temperature on their colouring effects. The simultaneous TG-DTA measurements were used for determination of the temperature
region of the pigment formation and thermal stability of pigments. The pigments were also evaluated from the standpoint of
their structure and particle sizes. 相似文献
4.
Solid electrolytes with potassium-cation conductivity in the K1 − 2x
Pb
x
GaO2 system were synthesized and studied. It was found that solid solutions based on potassium monogallate are formed in a wide
range of compositions. They contain vacancies in the potassium sublattice that provide for high conductivity of electrolytes.
The relationship is considered between electric characteristics of solid electrolytes and the composition and structure of
solid solutions. The results are compared to the earlier obtained data for similar solid electrolytes based on potassium monoaluminate
and monoferrite. 相似文献
5.
Ahmad Nazrul Rosli Noriza Ahmad Zabidi Hasan A. Kassim Keshav N. Shrivastava 《Journal of Cluster Science》2011,22(3):491-499
We have performed the calculation of the vibrational frequencies, Fermi energy and binding energy for several clusters of
Ni and vanadium atoms by using the first principles. The calculations are performed by using the density-functional theory
in the local-density approximation with spin polarized orbitals. The calculation of vibrational frequencies shows that some
of the clusters have positive vibrational frequencies which describe the oscillations of the stable clusters. The negative
vibrational frequencies indicate that these clusters are instable with respect to these vibrations when no energy of this
frequency is supplied. We find that for vanadium concentration less than 11.1% the clusters of Ni and V atoms are not stable.
Hence ferromagnetism in Ni is predicted below 11.1% vanadium. We find the vibrational frequencies of several clusters for
which the vanadium concentration is more than 11.1%. We are able to find a phase transition by use of quantum mechanics alone
without the use of classical mechanical variables or thermodynamic variables such as temperature. 相似文献
6.
The sol-gel method was used to prepare Y1–xBaxFeO3 (x = 0, 0.05, 0.1, 0.15, 0.2) nanocrystals. The influence of the dopant content on the particle size and magnetic properties of yttrium ferrite was examined. 相似文献
7.
New solid electrolytes with a high conductivity by K+ ions in the K1 − 2x
Sr
x
GaO2 system are synthesized and studied. It is found that the introduction of Sr2+ ions into potassium monogallate leads to the formation of solid solutions with KGaO2 structure in a wide range of additive concentration. These solid solutions exhibit a high conductivity; the conductivity
increases monotonically with increasing concentration of strontium within the single-phase range. The electrical characteristics
are related to the electrolyte structure. The results are compared with the earlier data for the gallate solid electrolytes
with the additives of four-charged cations and the systems based on potassium monoferrite and monoaluminate. 相似文献
8.
The conductivity of the entire solid solution La1–xSrxFeO3–, where x=0.2, 0.4, 0.5, 0.7 and 0.9, in the oxygen partial pressure range 10–19 to 0.5 atm and temperatures between 750 and 950 °C is reported. The analysis of the isothermal pressure dependences of the conductivity reveal that the lanthanum-strontium ferrites can be characterized as mixed ion-electron conductors in the low-oxygen pressure/high-oxygen deficiency limit. The partial contribution to conductivity from oxygen ions increases with strontium content and attains a maximal value at x=0.5. Further increase in doping results in the development of oxygen vacancy ordering phenomena and deterioration of the conducting properties.Presented at the OSSEP Workshop Ionic and Mixed Conductors: Methods and Processes, Aveiro, Portugal, 10–12 April 2003 相似文献
9.
R. Kh. Ishembetov M. Kh. Balapanov Yu. Kh. Yulaeva 《Russian Journal of Electrochemistry》2011,47(4):416-419
Temperature dependences of the Peltier coefficient are studied in the temperature range of 300–700 K under variation of the
composition of the Li
x
Cu(2 − x) − δS samples. The obtained values of the Peltier coefficient of the Li0.05Cu1.95 − δS samples with a different copper content are within the range of 0.1–0.4 J/A, which is somewhat higher than the similar parameters
of bismuth telluride, the basic material of semiconductor coolers. 相似文献
10.
V. G. Ponomareva V. V. Martsinkevich Yu. A. Chesalov 《Russian Journal of Electrochemistry》2011,47(5):605-612
The transport and thermal properties of Cs1 − x
Rb
x
H2PO4 in a wide range of compositions were studied. The binary salts Cs1 − x
Rb
x
H2PO4 (x = 0–0.9) contain solid solutions with a structure of CsH2PO4. The binary salts were synthesized by mechanically mixing the starting components and growing crystals by isothermal evaporation
from aqueous solutions. The properties of Cs1 − x
Rb
x
H2PO4 salts obtained by different procedures were found to differ considerably. At higher rubidium contents in compounds obtained
by mechanical mixing, the superionic transition temperature rose insignificantly, the high-temperature phase conductivity
decreased twofold, the low-temperature conductivity increased within the limits of the order of magnitude, and the system
of hydrogen bonds was slightly weakened. In Cs1 − x
Rb
x
H2PO4 crystals grown from solutions, the temperature of the superionic transition decreased along with its slowing down, and the
low-temperature conductivity increased by more than three orders of magnitude because of the higher contents of residual acid
aqueous centers in the structure of the salt. These systems are characterized by increased thermal stability. 相似文献
11.
Nitrogen-doped titania was coupled with the commercial titania nanoparticles by mechanical milling in liquid medium. The as-prepared
nanocomposites (TiO2/TiO2−x
N
y
) were characterized by X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) specific surface area, UV–Vis spectroscopy,
chemiluminescence, and acetaldehyde decomposition activity techniques. When a small amount of nitrogen-doped titania was added
into the commercial titania, higher intensity and longer lifetime of 1O2 was observed, and the photocatalytic activity was efficiently improved. The TiO2−x
N
y
acts as the acceptor of photoinduced holes. The recombination of the electron-hole was effectively depressed by the heterogeneous
electron transfer. This could be an effective way to obtain highly active photocatalysts. 相似文献
12.
13.
T. G. Aminov G. G. Shabunina E. V. Busheva V. M. Novotortsev 《Russian Journal of Inorganic Chemistry》2017,62(3):361-371
Temperature-dependent magnetization was measured for CuCr2–x Sb x Sе4 solid solutions in the range 300–5 K in a weak field (50 Oe) and a strong field (10 kOe) and in an ac magnetic field having a frequency of 100–10000 Hz and an amplitude of Н = 1 Oe. The type and character of magnetic transitions under investigation in the system were determined, and its magnetic phase diagram was constructed. 相似文献
14.
Zhang Lan Xin Chen Sheng Zhang Jihuai Wu 《Journal of Solid State Electrochemistry》2018,22(2):347-353
Three-dimensional TiO2 hierarchical nanostructures (3D-TiO2-HNs) containing TiO2 nanotrees and nest-like hollow spheres were synthesized and used as backbones for CdSe x S1?x quantum dot (QD) loading. These CdSe x S1?x QD-sensitized 3D-TiO2-HNs were then used as photoelectrodes in the preparation of quantum-dot-sensitized solar cells. As revealed by TEM images, the highly porous 3D-TiO2-HNs represent an excellent framework on which to deposit a large number of CdSe x S1?x QDs in order to form homogeneous and compact CdSe x S1?x -sensitized layers in photoelectrodes using a spin-assisted successive ionic layer adsorption and reaction method (spin-SILAR). Following careful adjustment of the molar ratio of Se2? to S2?, the number of spin-SILAR cycles, and the thickness of the CdS passivation layer used, the best-performing QDSC was shown to yield a short-circuit current density of 18.22 mA cm?2, an open-circuit voltage of 0.520 V, a fill factor of 0.510, and a power conversion efficiency of 4.83%. This high performance is possible because the device is able to absorb a relatively broad range of wavelengths and because charge recombination is suppressed in the device. 相似文献
15.
Analytical relations through the initial values are derived for the molecular auxiliary functions A
α (x) and B
n
(x), where α =n+ɛ, 0⩽ ɛ < 1 and n=0,1,2,.... These relations are useful in the fast calculation of multicenter molecular integrals over integer and noninteger n Slater type orbitals. It is shown that the formulas obtained are numerically stable for all values of n,ɛ and x.PACS No: 31.15.+q, 31.20.EjAMS subject classification: 81-V55, 81-V45 相似文献
16.
T. G. Aminov G. G. Shabunina E. V. Busheva V. M. Novotortsev 《Russian Journal of Inorganic Chemistry》2017,62(2):197-203
Magnetic properties of spinel solid solutions CuCr2–х Sb x Se4 (х = 0–0.5) were measured in the temperature range 5–300 K in a constant (50 Oe and 10 kOe) magnetic field. The results are interpreted in terms of the ionic model suggested earlier for CuCr2Х4 compounds. 相似文献
17.
Guanghua Li Ke Zhang Mohammed Adnan Mezaal Lixu Lei 《Journal of Solid State Electrochemistry》2016,20(2):421-427
La1-x Sr x MnO3 (x?=?0.1~0.4) catalysts for primary and rechargeable zinc-air batteries have been successfully synthesized by the citrate method and their electrochemical properties measured. The materials can catalyze both ORR and OER, and the one with ideal composition of La0.8Sr0.2MnO3 catalyst exhibits the highest catalytic activity and durability in alkaline medium. The resulting primary zinc-air cell shows a peak power density of 146 mW cm?2 at 235 mA cm?2. The secondary cell exhibits a charge-discharge voltage gap of 1.0 V at 10 mA cm?2, which is highly stable over many charge-discharge cycles. 相似文献
18.
O. N. Karpov M. V. Tomkovich E. A. Tugova 《Russian Journal of General Chemistry》2018,88(10):2133-2138
Nd1–xBixFeO3 nanocrystals with crystallite size 30?60 nm have been prepared under conditions of glycine–nitrate burning. Single-phase Nd1–xBixFeO3 nanocrystals are formed over the entire studied concentrations range if the glycine–nitrate synthesis is performed in excess of the oxidizer. Under these conditions, a continuous range of the Nd1–xBixFeO3 solid solutions (0 ≤ х ≤ 0.75) crystallized in the rhombic system (space group Pbnm) are formed without crystallization of the burning intermediates. The Nd1–xBixFeO3 solid solutions (х = 0.775, 0.8) crystallize in the rhombic system (space group Pbаm). 相似文献
19.
A. S. Shkvarin Yu. M. Yarmoshenko N. A. Skorikov A. I. Merentsov A. N. Titov 《Journal of Structural Chemistry》2011,52(1):70-75
Solid solutions of 1T-Cr x Ti1?x Se2 (x = 0?0.83) were synthesized for the first time. To study the electronic structure of Cr x Ti1?x Se2 monocrystals, photoemission spectra of core levels, resonance spectra of valence bands, and absorption spectra of Ti and Cr were obtained. Titanium and chromium atoms were found to have the oxidation state 4+ and 3+, which is supported by atomic multiplet calculations for Ti and Cr in the octahedral environment. According to calculation of the local density of chromium electronic states, the Cr3d electrons are spin-polarized, and the density of chromium states is of half-metal nature. The calculation agrees well with the experimental data. 相似文献
20.
Kuppan Saravanan Jagadese J. Vittal M. V. Reddy B. V. R. Chowdari Palani Balaya 《Journal of Solid State Electrochemistry》2010,14(10):1755-1760
Although LiFePO4 (LFP) is considered to be a potential cathode material for the lithium-ion batteries, its rate performance is significantly restricted by sluggish kinetics of electrons and lithium ions. Several attempts have been made so far to improve the performance of LiFePO4 by reducing the grain size, doping with aliovalent atoms, and coating conductive materials such as carbon or RuO2. We report here synthesis of LFP nanoplates by solvothermal method, tailoring the thickness as well as carbon coverage at surfaces to explore their influence on the storage performance. Due to the fact that Li+ ion diffuses along the b-axis, solvothermal method was aimed to control the thickness of nanoplates across the b-axis. We synthesized several nanoplates with various plate thicknesses along b-axis; among those, nanoplates of LFP with ~30-nm-thick b-axis having thin (2–5 nm) and uniform layer of carbon coating exhibits high storage capacity as well as high rate performances. Thus, a favorable morphology for LiFePO4 has been achieved via solvothermal method for fast insertion/extraction of Li+ as compared to spherical nanoparticles of carbon-coated LFP. Galvanostatic cycling shows a capacity of 164?±?5 mAh g?1 at 0.1 C rate, 100?±?5 mAh g?1 at 10 C rate, and 46?±?5 mAh g?1 at 30 C rate, with excellent capacity retention of up to 50 cycles. Further attempts have been made to synthesize LiMnPO4 (LMP) as well as Li(Fe1???x Mn x )PO4/C (x?=?0.5) nanoplates using solvothermal method. Although LiMnPO4 does not exhibit high storage behavior comparable with that of LiFePO4, the mixed systems have shown an impressive storage performance. 相似文献