Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
We demonstrate a successful growth of GaP1−xNx alloys on GaP by metalorganic vapor phase epitaxy (MOVPE). This alloy system is predicted to have an extremely large miscibility gap, ranging from x=0.0000003 to 0.9999997 at 700 °C. However, metastable alloys (x≤0.04) have been obtained at the growth temperature of 630–7…
Transport properties and optical conductivity are calculated for the crystalline approximant AlMn alloy. The number of electrons at the Fermi energy is very small and, based on the band structure, the anomalously small dc conductivity and temperature dependent thermoelectric power are explained. A model calculation fo…
The surface chemical modification of poly(tetrafluoroethylene) and poly(tetrafluoroethylene- co-hexafluoropropylene) films was carried out in hydrazine gas photolyzed with ArF excimer laser irradiation. The contact angle of the modified surfaces with water changed from 130° to 30° due to the reaction with hydrazine. N…
We describe how general lattice images may be used to measure the variation of the potential in crystalline solids in any projection, with no knowledge of the imaging conditions. This approach is applicable to structurally perfect samples, in which interfacial topography or changes in composition are of interest. We p…
The kinetics during the induction period of polymer crystallization is studied by means of depolarized light scattering measurements. The spinodal decomposition during this period is shown to be caused by orientation fluctuations of polymer segments. Time evolution of these orientation fluctuations can be described by…
Equilibrium sedimentation profiles of concentrated suspensions of charged colloids are accurately determined by measuring the intensity of the depolarized light scattered by optically anisotropic particles. From the data we derive the osmotic pressure \ensuremath{\Pi} versus the particle volume fraction \ensuremath{\P…
We report measurements of the hysteretic capillary condensation of helium in the porous material Nuclepore which display a hierarchy of return point memory effects and near congruence of closed internal hysteresis loops. Deviations from predictions based on the Preisach model of independent elementary hysteresis domai…
Results of Mn, Fe, Co, and Cu admixture EPR spectra studies in PLZT and PMN ceramics are discussed. The spectra of Mn, Fe, and Co ions with dominating absorption at geff = 2.0 and 4.3 are proposed due to d5 (S = 5/2) configurations (Mn2+, Fe3+, Co4+). The latter can be used as probes disclosing specific features (glas…
Abstract To assess the potential of naturally occurring substances in the treatment of heavy‐metal intoxication, the interaction between D ‐galacturonic and D ‐glucuronic acids with several trivalent lanthanide ions has been studied in aqueous solutions by means of a spectrophotometric method (27°; 0.1 M NaClO 4 ; pH…
Abstract [Rh 1 (η 5 ‐azulene)(cod)] + BF complexes 3a–g (cod = ( Z,Z )‐cycloocta‐1,5‐diene) have been synthesized by reaction of [Rh 1 (cod)] + BF in THF with the corresponding azulenes 1a–g ( Table 1 ). The structure of [Rh 1 (cod)(η 5 ‐guaiazulene)] + BF ( 3a ) has been determined by X‐ray diffraction analysis ( Fig…
The dielectric dispersion in the ferroelectric Li 2- x Na x Ge 4 O 9 ( x ≈1) single crystals has been measured in the frequency range from 120 Hz to 10 MHz around the transition temperature T C =109 K. The Debye-type dispersion was observed in the MHz region. The relaxation time increases abruptly as T C is approached…
This paper presents the second results of a research about trie structure and functioning of the phytoptanktonic community of Tibagi River, a taxonomic research about the genus Closterium (Zygnemaphyseae). Fifty nine samples were collected with a net of 30um mesh opening. In twenty three of these samples the Ctosteriu…
The structure of tin zirconium trisulfide is of the NH4CdCl3 type with double columns of edge-sharing Zr octahedra. These columns are linked together by Sn atoms. Sn is coordinated to three S atoms at 2 x 2.619 (2) and 2.765 (2) angstrom; a fourth S atom is at 3.065 (2) angstrom. The zirconium coordination is approxim…
Abstract The global, dynamical behaviour of suspensions of small, orientable, non-interacting particles is investigated. Owing to spatial inhomogeneity of the flow field, certain orientations of particles may be favoured in different regions of the flow. Favoured orientations may be deduced from an analysis of the his…
Spin-coated solid films of the gold-cluster compound Dodeca-(triphenylphosphine), hexa(chloro)pentapentacontagold Au55(PPh3)12Cl6 are irradiated with a focused 20-keV Ga+ focused-ion beam. The writing speeds on the substrate were ranging from 50 up to 2000 μm/s. This treatment locally decreases the solubility of the m…
The band structure of SnGe in the zinc-blende structure is calculated using the scalar-relativistic linear-muffin-tin-orbital method in conjunction with the density-functional scheme. The local-density approximation is empirically corrected by means of an external potential. Special emphasis is placed on the effects o…
A microscopic model for low energy electron interaction in alkali halides was used to simulate secondary electron emission from CsI induced by x rays with energies up to 100 keV. The integral ‘‘current’’ and ‘‘pulse’’ yields were calculated as function of the x-ray energy, CsI convertor thickness, and angle of inciden…
Thermal and dielectric properties of LaBGeO 5 , a new ferroelectric with a stillwellite-type structure are investigated. The specific heat, C p , shows one clear anomaly (Δ S =0.114 R) at 802.5 K. The basic thermodynamic parameters are determined on the basis of the Landau theory. However, an additional hump in C p wa…
Monte Carlo simulation is used to calculate the composition profiles of surface segregation of Cu-Ni alloys. The method of Bozzolo, Ferrante, and Smith [Phys. Rev. B 45, 493 (1992)] is used to compute the energetics of these systems as a function of temperature, crystal face, and bulk concentration. The predictions ar…
A spin-resolved x-ray-photoelectron-spectroscopy study of the deep core levels of ferromagnetic Fe are reported. The 2${\mathit{p}}_{3/2}$, 2${\mathit{p}}_{1/2}$, and 2s core levels, as well as the more shallow 3p level, all display interesting spin-dependent structures. These findings indicate the importance of intra…