Materials Literature
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The anisotropy of the magnetoresistance has been measured systematically by changing the current and field direction with respect to the crystallographic axes in the quasi-two-dimensional organic conductor \ensuremath{\alpha}-(BEDT-TTF${)}_{2}$KHg(SCN${)}_{4}$, where BEDT-TTF denotes bis(ethylenedithio)tetrathiafulval…
A detailed surface chemistry mechanism is proposed for chemical vapor deposition of diamond films, which extends the growth-by-methyl mechanism proposed by Harris to treat any CHm radical, m=0–3, as a growth monomer. Numerical computations were performed in which the mechanism was coupled to a model for the boundary l…
The meta-antimonates, MSb 2 O 6 , M=Ca, Sr and Ba, have been prepared, and their crystal structures refined from powder X-ray diffraction data. The interatomic distances have been determined to reasonable accuracy and the preferred space group was found to be P31m, not the previously identified P312 (a subgroup of P31…
Polycrystalline samples of Ba2(ZnxFe1−x)2Fe28O46 [(ZnxFe1−x)2−X, 0≤×≤1] X-type hexaferrites were prepared by the ceramic method. Magnetization, magnetic moment, and Curie temperature were investigated. With increasing Zn content the magnetization and magnetic moment increase linearly, but the Curie temperature decreas…
The M 2 p core-level XPS peaks of doped elements in Ni 1- x M x S are observed at the binding energies of M in "M 2 S 3 " rather than those of "MS" below and above the nonmetal-metal transition temperature ( T t ), indicating that the M atom are ionized to M 3+ and acts as shallow donor impuritites. Below T t the T 1/…
Abstract Polyether‐based polyurethane/poly (methyl methacrylate‐co‐ethyleneglycol dimethacrylate) interpenetrating polymer networks [PU/P (MMA–co–EGDMA)‐IPNs] were synthesized and used as adhesives to adhere vulcanized natural rubber (NR) and soft polyvinyl chloride (PVC). The structure and morphology of the IPN adhes…
Chemical composition, core-level line shape, and electron affinity measurements are performed on the Se-terminated (2\ifmmode\times\else\texttimes\fi{}1) and Zn-terminated c(2\ifmmode\times\else\texttimes\fi{}2) ZnSe(100) surfaces. The (2\ifmmode\times\else\texttimes\fi{}1) reconstruction corresponds to a complete mon…
We study the recombination mechanism of the visible photoluminescence (PL) S-band in p-doped porous Si layers by time-resolved photoluminescence. From the observed ‘‘stretched-exponential’’ PL decays we present a simple yet accurate evaluation method for lifetime distributions G(τ) and average recombination lifetimes…
The electron-electron correlation has been considered by using the local-spin-density approximation (LSDA) with on-site Coulomb interaction (LSDA+U) in the first-principles discrete variational cluster method. Based on the correction to LSDA, we have carried out the self-consistent electronic-structure calculations fo…
Abstract Phenylacetylenes having one or two trimethylsilyl groups at their benzene ring were synthesized, and polymerized by [Rh(cyclooctadiene) (PPh 3 ) 2 ]PF 6 , [Rh(norbornadiene)Cl] 2 , or WCl 6 to afford high molecular‐weight polymers in high yields. These poly(phenylacetylene)s were soluble in many kinds of solv…
Abstract When poly(butylene terephthalate) (PBT) is annealed, a second endotherm is often displayed in a subsequent scanning thermal analysis at a temperature below that of the original endotherm, and this new endotherm appears to grow with annealing at the expense of the original. This growth is not due to chemical c…
Soft-recovery plate impact experiments have been conducted to study the evolution of damage in polycrystalline Al2O3 samples. Examination of the recovered samples by means of scanning electron microscopy and transmission electron microscopy has revealed that microcracking occurs along grain boundaries; the cracks appe…
Periodic Hartree-Fock total-energy calculations on two-dimensional slabs have been used to study the symmetry-conserving relaxation of the nonpolar (101\ifmmode\bar\else\textasciimacron\fi{}0) surface of ZnO. We find that it is energetically favorable for the Zn-O surface dimers to tilt slightly (by 2.3 \ifmmode^\circ…
Rhombohedral Cr 2 Se 3 is an antiferromagnetic compound with antiferromagnetic AF(L) phase below 38 K (= T t ) and the antiferromagnetic AF(H) one between 38 K and 45 K (= T N ). Neutron diffraction studies for rhombohedral Cr 2 Se 3 are carried out at temperatures from 6 K to 77 K. The results show that the magnetic…
The transverse thermal conductivities of SiO2 thin films are determined as a function of film thickness. The results indicate that the apparent thermal conductivities of SiO2 thin films are much lower than the thermal conductivity of bulk SiO2. In addition, a slight decrease in the thermal conductivity is observed as…
Abstract The anisotropy of the thermal expansion of polyimide films was investigated . Out‐of‐plane or thickness direction coefficients of linear thermal expansion (CTE) were calculated from the difference between the coefficient of volumetric expansion (CVE) and the sum of the in‐plane or film direction coefficients…
A systematic study of Sn-doped lead zirconate titanate ceramics has been carried out as a function of Sn and Ti contents. Dielectric constant and remanent polarization measurements have been performed and compared to our recent transmission electron microscopy study. The dielectric maximum was found to be associated w…
We report on the optical band gap of the filled tetrahedral semiconductor LiZnAs [viewed as a hypothetical zinc-blende (ZnAs${)}^{\mathrm{\ensuremath{-}}}$ lattice partially filled with He-like ${\mathrm{Li}}^{+}$ interstitials]. The band-structure nature of LiZnAs is found to be direct with a forbidden gap of 1.51 eV…
Heavily doped polypyrrole-hexafluorophosphate, PPy(${\mathrm{PF}}_{6}$), undergoes a metal-insulator (M-I) transition at resistivity ratio ${\mathrm{\ensuremath{\rho}}}_{\mathit{r}}$=\ensuremath{\rho}(1.4 K)/${\mathrm{\ensuremath{\rho}}}_{\mathit{r}}$(300 K)\ensuremath{\approxeq}10: for ${\mathrm{\ensuremath{\rho}}}_{…
We have shown that sterically stabilized (Stealth) liposomes (SL), can accumulate in the extracellular space within tumors, and may improve pharmacokinetics and therapeutic efficacy of encapsulated doxorubicin (SL-DOX). When SL-DOX were incubated in vitro at different temperatures with 50% bovine serum, approximately…