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1.
V. M. Novotortsev S. A. Varnavskii S. F. Marenkin L. I. Koroleva R. V. Demin V. M. Trukhan S. O. Klimonskii V. D. Kuznetsov 《Russian Journal of Inorganic Chemistry》2006,51(8):1153-1156
Solid solutions Cd1?x MnxGeP2 (x=0?0.19) have been synthesized and identified. In these solutions, the unit cell parameters decrease with an increase in the manganese content. The solid solution Cd0.81Mn0.19GeP2 is a ferromagnet with the Curie temperature T C ≈ 311 K. The paramagnetic moment of Mn2+ ions equal to 5.8 μB, as well as the spontaneous magnetization constituting 76% of the total magnetization of a crystal, has been determined with the use of the Langevin function. The origin of ferromagnetism in CdGeP2:Mn is exchange mediated by charge carriers (holes). These holes are caused by cationic defects in the structure of chalcopyrite. 相似文献
2.
G. N. Dorofeenko Yu. P. Andreichikov É. A. Zvezdina V. A. Bren' G. E. Trukhan V. V. Derbenev A. N. Popova 《Chemistry of Heterocyclic Compounds》1974,10(10):1177-1181
The pyridinium ring as a substituent in aniline is an electron acceptor, the effect of which is comparable to the effect of NO2 and N(CH3)2 groups. Correlation of the reactivities with the basicities of the amino groups is not observed in the investigated reactions of N-(aminophenyl)pyridinium perchlorates with some electrophilic reagents, inasmuch as steric factors apparently play a greater role. 相似文献
3.
Yu. P. Andreichikov M. I. Knyazhanskii Ya. R. Tymyanskii G. E. Trukhan G. N. Dorofeenko 《Chemistry of Heterocyclic Compounds》1974,10(6):696-698
The electronic spectra of a number of benzylidene derivatives of N-aminoarylpyridinium perchlorates are associated with absorption localized on the individual pyridinium and azomethine fragments and with intramolecular charge transfer (ICT) from the azomethine fragment to the pyridinium ring. The luminescence is associated with the latter process. The photochromism is due to proton transfer in the excited state of the azomethine fragment, which competes with ICT, and is also due to structural factors. 相似文献
4.
In the process of ion-induced CO adsorption (Ar+, 4 keV, 4 A/cm2) on polycrystalline Ni at room temperature and P=(1–40)×10–6 Pa the emission of Ni+, NiCO+, CO+, NiO+ and C+ ions is observed. The emission of the last three ions is due to the ion-stimulated dissociation of weakly bound CO state and NiO formation. The weakly bound state is formed owing to surface defects produced by ion bombardment. The cross sections of the ion-induced desorption are 1.8 and 0.8×10–14 cm2, respectively, for weakly bound and strongly bound states. 相似文献
5.
Ts. Z. Vitkina E. M. Smolyarenko V. M. Trukhan 《Crystal Research and Technology》1988,23(8):1023-1028
The results of experimental studies of the electrophysical and magnetic properties of solid solutions based on the AB compounds with anion (Zn3(PxAs1−x)2 and cation (ZnxCd1−x)3 P2 substitution are reported. The Zn3(AsxP1−x)2 solid solutions are characterized by p-type conductivity (∼ 1015 1017 cm−3), low Hall mobility and conductivity of ∼ 10−2 — 10−3 ohm−1 cm−1. In the (ZnxCd1−x)3P2 solid solutions the samples rich in zinc are p-type, those rich in cadmium — n-type, the carrier concentration is ∼ 1016 — 1018 cm−3. From the measurements of the magnetic properties of the above mentioned alloys it is shown that in the investigated solid solutions a transition from the structure with direct optical transition to those with indirect optical transition occurs. 相似文献
6.
We use tools of the equilibrium statistical mechanics of disordered systems to study analytically the statistical properties of an ecosystem composed of N species interacting via random mutual interactions, as well as via deterministic self-interactions of order p>/=2. We show that the main effect of increasing the order of the interactions among the species is to make the system less competitive, in the sense that the fraction of extinct species is greatly reduced. In addition, we find that for p>2 there is a threshold value which gives a lower bound to the concentration of the surviving species, preventing then the existence of rare species and, consequently, increasing the robustness of the ecosystem to external perturbations. 相似文献
7.
S. F. Marenkin V. M. Trukhan I. V. Fedorchenko S. V. Trukhanov T. V. Shoukavaya 《Russian Journal of Inorganic Chemistry》2014,59(4):355-359
A new ferromagnetic material based on a Cd3As2 + MnAs composite with the Curie point of 320 K has been prepared. Magnetic and electrical properties of the composite have been found to be determined by manganese arsenide nanoclusters. The composite has metallic conduction. Its resistance decreases with increasing magnetic field both at low and room temperatures, indicating spin-dependent scattering mechanisms and exchange interactions between magnetic nanoclusters in the composite. 相似文献
8.
S. N. Trukhan V. F. Yudanov O. N. Mart’yanov 《Russian Journal of Physical Chemistry B, Focus on Physics》2013,7(8):924-931
Temperature variations of the EPR spectra of VO2+ ions in sub- and supercritical water under isothermal and temperature gradient conditions are investigated using an in situ EPR. Broadening of the hyperfine structure at increasing temperature and the appearance of an unresolved broad low-intensity line (ΔH pp ≈ 300 Oe) in the supercritical state are observed in the absence of temperature gradients, indicating an increase of exchange interaction between VO2+ ions in supercritical water. An exchange-narrowed anisotropic absorption line is observed under the temperature-gradient conditions in the subcritical water near the transition to a supercritical state. The shape of this line is close to that observed in the solid salt VOSO4 · 3H2O. It is shown that in situ EPR allows us to investigate the effects of changing the local environment of paramagnetic ions, which precedes the well-known process of clustering and formation of amorphous oxide particles in sub- and supercritical conditions. 相似文献
9.
S. S. Yakushkin S. N. Trukhan V. F. Yudanov G. A. Bukhtiyarova O. N. Martyanov 《Applied magnetic resonance》2010,38(4):495-500
The scope of the electron paramagnetic resonance (EPR) technique in catalysis is often limited because of the presence of
the ferromagnetic nanoparticles in many catalytic systems. The present work gives an effective method to discriminate solid-state
EPR spectra in the microwave resonance absorption while investigating such systems. The approach is based on the different
features of the EPR spectra and ferromagnetic resonance absorption that are simultaneously observed in the system. 相似文献
10.
The main features of stepwise magnetization of dispersed ferromagnets caused by magnetic interparticle interactions are studied using a two-particle model. The ranges of values of the magnetic anisotropy constants of particles and of the dipole-dipole interaction between them are determined over which a reproducible jumpwise change in the magnetization of the system occurs in an external positive magnetic field. The proposed model is shown to explain the main specific features of the fine structure of the ferromagnetic resonance spectra. 相似文献