Materials Literature
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The ortho-para transition of interstitial ${\text{H}}_{2}$ in Si has been observed in a recent Raman study [M. Hiller et al., Phys. Rev. Lett. 98, 055504 (2007); M. Hiller et al., Phys. Rev. Lett. 99, 209901 (2007)]. In order to address issues that are difficult to study by Raman spectroscopy, we have performed IR-abs…
Alkaline niobate-based (K,Na,Li,Ba,Sr)(Nb,Ta,Zr)O 3 (ANSZ) ceramics were prepared by conventional sintering process, and their piezoelectric properties were measured. The Curie temperature ( T C ) of the ANSZ ceramic was 278 °C. The electromechanical coupling factor ( k p ) and the piezoelectric constant ( d 33 ) were…
Abstract The phase nature of polymer brush collapse upon deterioration of the solvent was investigated. The analysis is based on the self‐consistent field theory and the Flory‐Huggins model. It was shown that the transition from good to poor solvent via the θ ‐point is actually a phase transition of high order. This r…
Abstract BACKGROUND: The phase behavior of blends of semicrystalline aryl polyesters with long methylene segments ((CH 2 ) n with n = 5 or 7) in the repeat units has not been much studied. Thus, crystalline/crystalline blends comprising monomorphic poly(pentamethylene terephthalate) (PPT) and polymorphic poly(heptam…
We have measured the elastic constants of amorphous ${\text{Pd}}_{40}{\text{Cu}}_{40}{\text{P}}_{20}$ (isotropic, two independent elastic constants), single crystal ${\text{Pd}}_{40}{\text{Cu}}_{40}{\text{P}}_{20}$ (tetragonal, six elastic constants), and single crystal ${\text{Pd}}_{50}{\text{Cu}}_{50}$ (fcc, three e…
Zinksalze brechen Si-O-Bindungen: Für die Organosiliciumchemie sind die hohe Stabilität und chemische Beständigkeit der Si-O-Si-Bindung von herausragender Bedeutung. Die Bildung von hydrolysestabilen Metallasilanolaten belegt nicht nur, dass die Si-O-Si-Bindung mit einfachen Zinkverbindungen unter milden Bedingungen g…
A hot tip: Bifunctional tetrakis(imino)pyracene (tip) ligands undergo one-electron reduction at both diimine functionalities when treated with potassium metal, germanium dichloride, or decamethyleuropocene (see scheme, Cp*=C5Me5). The transferred electrons pair up in an orbital that is delocalized over both diazabutad…
(Na 0.52 K 0.44 Li 0.04 )(Nb 0.84 Ta 0.10 Sb 0.06 )O 3 (LF4) ceramics have been successfully prepared by a combination of a modified solid-state reaction and a conventional sintering method. LF4 fine powder with a perovskite structure was obtained by the modified solid-state reaction and continuous re-calcination trea…
Electric polarization and the strain of {100}-oriented epitaxial BiFeO 3 and BiFeO 3 –BiCoO 3 films grown on (100) c SrRuO 3 ∥ (100)SrTiO 3 substrates were simultaneously measured using synchrotron X-ray diffraction. The apparent piezoelectric coefficient d 33,obs values of BiFeO 3 and BiFeO 3 –BiCoO 3 films were 28 a…
Abstract An electroactive polymer with well‐defined oligoanilines in the main chain has been prepared by oxidative coupling polymerization. The detailed characteristics of the polymer were systematically studied by FT‐IR, 1 H NMR, GPC and XRD. Its electrochemical behavior was explored with UV‐Vis spectra and cyclic vo…
The optical properties of the chemical solution deposition (CSD)-derived BiFeO 3 (BFO) film and the pulsed laser deposition (PLD)-derived (Bi,Nd)(Fe,Mn)O 3 (BNFM) film were evaluated by spectroscopic ellipsometry, and their optical constants ( n , k ) and band gaps were determined. At a wavelength of 600 nm, the refra…
ABSTRACT Food foams may be defined as products containing a gaseous phase stabilized in a matrix containing water and proteins. The rheology of a foam can be altered by how the air bubbles inside are organized, its size and shape, allowing a product that was initially fluid to be molded, like marshmallow. Rheology mak…
Abstract The properties of an oligomeric cyanate ester polymer were modified by the addition of 0.01–3 wt.‐% multi‐walled carbon nanotube (MWNT) containing particles. The dynamic mechanical behavior and thermal properties of the cyanate ester/MWNT nanocomposites were evaluated. The storage modulus, G ′, of the nanocom…
Light-induced oscillatory behaviors of transmission in chalcogenide glasses are investigated using a continuous wave tunable Ti-sapphire laser. It is shown that phase change, thermal fluctuation, nonlinear index change and periodic self focusing are not at the origin of light-induced oscillatory transmittance in chalc…
Electronic and structural properties of perovskite BiZn 0.5 Ti 0.5 O 3 (BZT) have been investigated using a first-principles calculation with optimized structures. It has been found that the strong Coulomb repulsion between Bi and Zn, due to the 3s 2 , 3p 6 , and 3d 10 electrons of the Zn ion, favorably causes Zn ion…
A potential difference between the two layers of bilayer graphene caused by charge doping and/or an applied gate field can open a bandgap. In this paper, bandgap and charge controllability in graphene field-effect transistors (GFETs) with doped bilayer graphene channels is clarified by solving a one-dimensional Poisso…
(Na 0.52 K 0.44 Li 0.04 )(Nb 0.84 Ta 0.10 Sb 0.06 )O 3 (NKLNTS) thin films with a thickness of about 1.4 µm were fabricated on Pt/(001)MgO substrate, on which an NaNbO 3 buffer layer was introduced, by pulsed laser deposition (PLD). The X-ray diffraction pattern (XRD) showed that the 001 orientated NKLNTS thin films w…
Lead-free ferroelectric NaNbO 3 –BaTiO 3 thin films were prepared by chemical solution deposition. Perovskite single-phase NaNbO 3 –BaTiO 3 thin films were successfully fabricated at 550 °C on Pt/TiO x /SiO 2 /Si substrates. The ferroelectric properties of the NaNbO 3 –BaTiO 3 thin films depended on the BaTiO 3 conten…
We report the results of a series of ultrasound, Brillouin scattering, and optical heterodyne detected transient grating experiments performed on a LiCl, 6H(2)O solution from room temperature down to the vicinity of its liquid-glass transition, T(g) approximately 138 K. Down to T approximately 215 K, the supercooled l…
KNbO 3 films were grown at 240 °C by the hydrothermal method using KOH and Nb 2 O 5 as source materials. Film thickness increased with reaction time up to 3 h, however decreased for longer reaction times. A 16-µm-thick epitaxially grown KNbO 3 film with {100} pc orientation were successfully grown on (100) c SrRuO 3 ∥…