Materials Literature
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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…
In this study a systematic microstructural characterization of La-modified lead zirconate titanate was carried out by hot- and cold-stage transmission electron microscopy and selected area electron diffraction. The existence of 1/2[111] superlattice reflections (F spots) became evident near 300 °C on cooling. The inte…
Using dielectric spectroscopy, we have studied different types of relaxation processes, namely, primary (α), secondary (β), and other sub-Tg processes, in the supercooled liquids of tritolylphosphate (TTP), 3-bromopentane (3BP), isopropylbenzene (IPB), glucose (GL), and also in the supercooled plastic crystals of cycl…
One-dimensional-imaging laser-induced fluorescence spectroscopy (1D-LIF) has been applied to investigate the dynamics of the nonemissive neutral particles (YO molecules) during the ArF excimer laser ablation of YBa2Cu3O7−δ in an ambient oxygen gas. Investigating the 1D-LIF observation, the propagation of particles thr…
Results of scanning-tunneling-microscopy (STM) and molecular-dynamics (MD) annealing studies based on quantum-mechanically derived interatomic forces using a semiempirical density-functional approach are combined for analyzing diamond surface structures. Experimentally obtained STM images of diamond (100) and (111) fa…
The crystal structure of a binuclear copper(II) complex, μ-formato-1kO:2kO'-μ-2,2'-[1,3-(2-hydroxypropanediyl-1:2k 2 O)bis(nitrilomethylidyne)]diphenolato(3-)-1k 3 N,O:2k 2 N',O'-dicopper(II), [Cu 2 (L-sal)(HCOO)], H 3 (L-sal)=N,N'-bis(salicylidene)1,3-diamino-2-propanol, was determined by X-ray diffraction. The title…
A method is devised to find a lower bound on the loss function of graphite in the oxygen high energy range where that function is expected to assume constant value. It requires obtaining a small ensemble of classical trajectories of oxygen on graphite and making static measurements of an oxygen on ethylene potential e…
The local-density approximation is used to investigate the electronic and structural properties of ${\mathrm{Nb}}_{3}$${\mathrm{O}}_{3}$ and the reasons for its unusual defect rocksalt structure with 25% ordered vacancies. A tight-binding Hamiltonian is fitted to the energy bands which are compared to those of the hyp…