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。
For the first time the emission properties of Tm3+ doped Y3Al5O12 are studied in the near UV and visible ranges at 4.2 and 295 K. The observed emission peaks are ascribed to the transitions between Tm3+ energy levels and an overall energy level scheme of the Tm3+ ion in Y3Al5O12 with radiative and nonradiative transit…
Vacancy behavior in Cu-26 Zn-4 Al and Cu-14 Al-4 Ni alloys during ageing is investigated and compared by means of positron annihilation (PA) and electrical resistivity measurements. For ageing in the martensitic state after direct quenching, the experimental results show that the S parameter of CuZnAl specimens, mea…
The EPR spectra of manganese in polycrystalline BaTiO3 and n-BaTiO3 (lanthanum-doped BaTiO3) are studied. The measurements are carried out in all four phases of BaTiO3 to follow the phase transformations of the ceramic material by means of the microscopic probe manganese. The valence state of manganese in BaTiO3 and n…
The optical transmission spectra of amorphous AsS films of composition As32S68 prepared by thermal evaporation are measured over the 0.3 to 2.0 μm spectral region. A simple straightforward procedure suggested by Swanepoel is applied for determining the index of refraction and layer thickness; the absorption coefficie…
Crystal structure of intermediate phase of PbZrO 3 was analyzed by neutron powder diffraction. Superlattice reflections of our sample appeared at M and R points. Intensities of fundamental reflections also changed in the phase. The structural modulations were associated with modes either Γ 15 + M 3 + R 25 or Γ 15 + M…
Electron spin resonance (ESR) and magnetic susceptibility of two chromium trimer complexes are investigated. Temperature dependence of magnetic susceptibility is well explained by antiferromagnetically coupled trimer model with two kinds of isosceles trimers in Cr-acetate and one isosceles trimer in Cr-propionate. A w…
Abstract Study of the simultaneous interpenetrating polymer network (IPN) between diglycidyl ether of bisphenol‐A (DGEBA) and unsaturated polyester (UP) was carried out at ambient temperature. Fourier transform infrared (FTIR) spectroscopy was employed to investigate the intermolecular H‐bonding and functional group c…
The affinity of polyclonal anti-IgG for human IgG adsorbed on silica surfaces was investigated by two complementary techniques, scanning angle reflectometry and 125I radiotracing. Special attention was paid to compare the reactivity of IgG adsorbed directly or by exchange with already adsorbed albumin. In particular i…
Dental ceramics generally fail because of the growth of microscopic surface flaws that form during processing or finishing or that result from surface impact during service. The ion-exchange process has been shown to be effective in improving the flexural strength of most dental porcelains through the development of a…
We report on a resonant photoemission study of Ni metal and CuO at the L III soft-X-ray absorption thresholds. The valence band spectra exhibit a strong enhancement of electron emission at resonance, which is shown to be mostly due to an incoherent superposition of a photoemission signal with a more intense signal fro…
The scaling of the critical temperature (Tc) with the degree of polymerization (N) in symmetric polymer blends is investigated via a new molecular closure to the polymer reference interaction site model integral equation theory. The theory predicts Tc∼N, which is qualitatively consistent with classical mean field idea…
The magnetism of ${\mathrm{Fe}}_{\mathrm{N}}$ clusters is studied by using a d-band Hubbard-like Hamiltonian in the unrestricted Hartree-Fock approximation. The local magnetic moments, magnetic order, and average magnetization per atom are calculated for T\ensuremath{\rightarrow}0 as a function of the intra-atomic Cou…
The occurrence of stress in thin films has led to serious considerations of stability problems in the semiconductor industry. It may cause mechanical failure of films, such as adhesion reduction or contact peel-off, or variations in electrical properties. The existence of stress will also alter electromigration behavi…
Important parameters of the bulk and surface electronic structure are obtained for Cu(100), Ag(100), Au(100), and ${\mathrm{Cu}}_{3}$Au(100) surfaces using inverse photoemission with a high-resolution, tunable detector. The transitions from the Fermi level to the upper ${\mathrm{\ensuremath{\Delta}}}_{1}$ s,p band are…
A model was developed to account for the recent observations indicating that type I collagen fibrils assembled in vivo grow from symmetrical pointed tips. The essential features of the model are (i) a distinctive structural nucleus forms at each end of a growing fibril and growth of the fibril then proceeds by propaga…
The metalorganic chemical vapor deposition technique has been successfully applied to the growth of epitaxial platinum thin films on (100) surfaces of single-crystal potassium tantalate (KTaO3) and strontium titanate (SrTiO3). Platinum thin films grown on KTaO3 (100) at a rate of 70 nm/h showed strong Rutherford backs…
The dielectric permittivity and loss tangent of hyperquenched glassy water (HGW) have been measured for fixed frequencies of 1 and 10 kHz from 80 K to its crystallization temperature and corresponding measurements have been made of the crystallized forms. The effect of thermal cycling has been investigated. Except for…
Dissolution (mixing or melting) of inhomogeneities formed during spinodal decomposition in binary polymer mixtures is studied both experimentally and theoretically. The details of the dissolution experiment with time-resolved light scattering on polystyrene/poly(vinylmethylether) are presented. The theoretical approac…
Polycrystalline silicon (poly-Si) thin films prepared by recrystallization of α-Si either with annealing or ion implantation and annealing have been studied with the optical techniques of spectroscopic ellipsometry (SE) and Raman spectroscopy (RS), as well as with transmission electron microscopy (TEM). A detailed ana…
The Raman spectra of polycrystalline silicon doped with implanted boron were measured before and after thermal annealing. In addition to the peak of the silicon phonon mode at 521 cm−1, a shoulder at about 500 cm−1 was observed. For samples without annealing, this shoulder increased with the increase of the dopant dos…