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排序方式: 共有141条查询结果,搜索用时 31 毫秒
1.
A.A. FilaretovM.G. Zhizhin L.N. KomissarovaV.P. Danilov V.V. ChernyshevB.I. Lazoryak 《Journal of solid state chemistry》2002,166(2):362-368
A new ammonium indium phosphate (NH4)In(OH)PO4 was prepared by hydrothermal reaction in the In2O3-NH4H2PO4-NH3/OH system (T=200°C, autogenous pressure, 7 days). The formula (NH4)In(OH)PO4 was determined on the basis of chemical and thermal analysis (TG/DSC), X-ray powder diffraction and IR-spectroscopy. (NH4)In(OH)PO4 crystallizes in the tetragonal system with space group P43212 (No. 96); a=9.4232(1) Å, c=11.1766(1) Å, V=992.45(2) Å3; Z=8. The crystal structure was refined by the Rietveld method (Rw=6.35%, Rp=5.10%). The second-harmonic generation study confirmed that structure of (NH4)In(OH)PO4 does not have a center of symmetry. The cis-InO4(OH)2 octahedra form helical chains, parallel to the c-axis. The In-O-In bonds are nearly equidistant. The chains are interconnected by phosphate tetrahedra and create tunnels containing the NH4+ ions along the c-axis. (NH4)In(OH)PO4 is isostructural with RbIn(OH)PO4. 相似文献
2.
3.
K.R. Allakhverdiev M.A. Nizametdinova E.Yu. Salaev R.M. Sardarly N.Yu. Safarov E.A. Vinogradov G.N. Zhizhin 《Solid State Communications》1980,36(6):527-532
The lattice vibration spectra of TlS and TllnSe2 crystals were investigated by infrared reflectivity in the wavenumber range from 20 to 5000 cm?1. The frequencies of K = 0 phonons were determined by Kramers-Kronig analysis of the spectra. All five infrared active lattice vibrations predicted by the group theoretical analysis were identified. The normal coordinates of vibrations for five infrared active phonons were determined. In the approximation which does not take into consideration long range Coulomb interaction values of the force constant and effective changes are obtained for TlSe, TlS and TllnSe2 crystals. 相似文献
4.
E. Yu. Matveev S. S. Akimov A. S. Kubasov A. I. Nichugovskii A. S. Nartov V. M. Retivov K. Yu. Zhizhin N. T. Kuznetsov 《Russian Journal of Inorganic Chemistry》2017,62(6):808-813
The reactions of 1,4-dioxane-substituted closo-decaborate anion ([B10H9O2C4H8]–) with metal acetylenides, diethyl malonate, ethyl acetoacetate, triethyl orthoformate, acetylacetone, and malonodinitrile were studied. The reactions were shown to be accompanied with substituent ring opening and attachment of the corresponding pendant functional group. The obtained compounds were characterized by various physicochemical methods (IR and polynuclear NMR spectroscopy, ESI mass spectrometry). 相似文献
5.
K. Yu. Zhizhin A. P. Zhdanov N. T. Kuznetsov 《Russian Journal of Inorganic Chemistry》2010,55(14):2089-2127
Methods of introducing functional groups into the [B10H10]2− anion based on electrophilic, radical, or nucleophilic substitution for exo-polyhedral hydrogen atoms have been surveyed. Special attention has been focused on nucleophilic substitution reactions promoted
by acids, including protonic acids, anhydrous hydrogen halides, metal halides, and carbocations. In addition, methods of tailored
functionalization of the substituents in the cluster have been described. 相似文献
6.
E. Yu. Matveev G. A. Razgonyaeva V. N. Mustyatsa N. A. Votinova K. Yu. Zhizhin N. T. Kuznetsova 《Russian Chemical Bulletin》2010,59(3):556-559
The reaction of the [B10H9O2C4H8]−, [B10H9OC4H8]−, and [B10H9OC5H10]− anions with negatively charged S-nucleophiles, such as SH−, SCN−, and S2O3
2−, resulted in the ring opening of the cyclic substituent and the formation of derivatives with the terminal thiol, thiocyanate,
and thiosulfate groups. The structures of the products were confirmed by the IR, mass, and 1H, 11B, and 13C NMR spectra. 相似文献
7.
8.
M.A. Strelkov M.G. Zhizhin L.N. Komissarova 《Journal of solid state chemistry》2006,179(12):3664-3671
Three new silver indium double phosphates Ag3In(PO4)2 (I), β-(II) and α-Ag3In2(PO4)3 (III) were synthesized by solid state method (I and II—700 °C, III—900 °C). Compounds I and II crystallize into a monoclinic system (I—sp. gr. C2/m, Z=2, a=8.7037(1)Å, b=5.4884(1)Å, c=7.3404(1)Å, β=93.897(1)°; II—sp. gr. C2/c, Z=4, a=12.6305(1)Å, b=12.8549(1)Å, c=6.5989(1)Å, β=113.842(1)°), and compound III crystallize into a hexagonal system (sp. gr. R-3c, Z=6, a=8.9943(1)Å, c=22.7134(1)Å). Their crystal structures were determined by the Rietveld analysis (I—Rp=6.47, Rwp=8.54; II—Rp=5.67, Rwp=6.40; III—Rp=7.30, Rwp=9.91). Structure of Ag3In(PO4)2 is related to the sodium chromate structure type and is isotypic to α-Na3In(PO4)2. The polymorphous modifications of β- and α-Ag3In2(PO4)3 are isostructural to sodium analogs (β- and α-Na3In2(PO4)3) and are related to alluaudite (II) and NASICON (III) structure types. Compounds I and II are not stable at temperature above 850 °C. Ag3In(PO4)2 is decomposed providing silver orthophosphate Ag3PO4 and α-Ag3In2(PO4)2. β-Ag3In2(PO4)3 is transformed to α-Ag3In2(PO4)3. 相似文献
9.
E. V. Alieva G. N. Zhizhin L. A. Kuzik V. A. Yakovlev 《Physics of the Solid State》1998,40(2):213-216
First observation of excitation of surface electromagnetic waves (SEW) is reported in the reststrahlen region in for biaxial
crystal KTiOPO4 (KTP) using a tunable CO2 laser around 10 μm, and for CaF2, BaF2, MgO (cubic crystals), and LiNbO3 (uniaxial crystal) in the far IR using ith a free-electron laser. The parameters of SEW propagation in these crystals have
been obtained by the interference method of SEW phase spectroscopy, and the possibility of determining the complex dielectric
permittivity of crystals from the SEW propagation parameters demonstrated in the range of SEW existence.
Fiz. Tverd. Tela (St. Petersburg) 40, 237–241 (February 1998) 相似文献
10.
The equilibrium of the three most stable conformations of cis-1-methyl-2-ethylcyclohexane has been examined on the basis of changes in intensity of the triplet at 585–610 cm–1 in its infrared absorption spectrum on changing the temperature from 30° to –140° C. H and S have been determined. 相似文献