Materials Literature
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We present trends in the multilayer relaxations of several vicinals of Cu(100) and Cu(111) of varying terrace widths and geometry. The electronic structure calculations are based on density functional theory in the local density approximation with norm-conserving, non-local pseudopotentials in the mixed basis represen…
The hole-doped (p-) manganite La0.7Ca0.3MnO3 and the electron-doped (n-) manganite La0.7Ce0.3MnO3 undergo an insulator-to-metal transition at around 250 K, above which both behave as a polaronic semiconductor. We have fabricated an epitaxial trilayer (La0.7Ca0.3MnO3/SrTiO3/La0.7Ce0.3MnO3), where SrTiO3 is an insulator…
We have investigated the antiferroquadrupolar(AFQ) order in DyB$_2$C$_2$ by resonant x-ray scattering. X-rays with energies near the $L_3$ absorption edge of Dy were employed. Superlattice peaks that correspond to three kinds of propagation vectors of (1 0 0), (1 0 1/2) and (0 0 1/2) were investigated in detail with p…
We report resistivity, thermopower and magnetic susceptibility measurements on the Nb$_4$-cluster compounds Ga$_{1.33}$Nb$_4$X$_{8}$ (X = S, Se), derived from vacancy ordered spinels A$_x$T$_4$X$_8$. The cubic selenide phase is insulating and its resistivity crosses over from $\lnρ \sim T^{-1}$ to $\sim T^{-1/2}$ on c…
The processes of freezing and melting were present at the beginnings of the Earth and continue to dominate the natural and industrial worlds. The solidification of a liquid or the melting of a solid involves a complex interplay of many physical effects. This 2001 book presents in a systematic way the field of continuu…
Thermal elimination reactions on polycarbonates are investigated from both theoretical and experimental points of view, to obtain insight into the microscopic aspects that influence the reaction mechanism and rates. In particular, attention is focused on the influence of the type of substituents in the polymer chain o…
Electropolymerized films of the functionalized pyrrole, pentafluorophenyl-3-(pyrrol-1-yl)propionate (PFP), were reacted with a solution-phase nucleophile, ferrocene ethylamine. This reaction was chosen as a model representative of a postdeposition modification of the polymer membrane's properties. For the first time,…
A large photoinduced anisotropy ratio was observed in the push−pull azo dyes bonded covalently to polyurethane by polarized UV−vis spectroscopy. During irradiation with an Ar + laser, the absorbance perpendicular to the polarization direction of the laser light increases gradually even when the photoisomerization rate…
New derivatives of poly(isothianaphthene methine) have been synthesized by a polycondensation reaction of 1,3-bis( tert -butyldimethylsilyl)isothianaphthene with benzaldehydes in the presence of POCl 3 . In the para position the benzaldehydes possesses a liquid crystalline group, which contains a phenylcyclohexyl, phe…
We study the phase behavior of a binary mixture of thin and thick hard platelets, using Onsager's second virial theory for binary mixtures in the Gaussian approximation. Higher virial terms are included by rescaling the excluded volume part of the Onsager free energy using a modified form of the Carnahan−Starling free…
The comonomer compositional distribution and thermal and morphological characteristics were investigated for five bacterially synthesized poly(3-hydroxybutyrate-co-3-hydroxyvalerate) [P(3HB-co-3HV)] samples with 3HV content of 45, 49, 70, 80, and 96 mol %. All these samples were fractionated into many fractions with w…
The metal-based emission of a series of luminescent europium and terbium complexes incorporating an aromatic chromophore is rendered pH-dependent either through perturbation of the aryl singlet or triplet energy or by modulating the degree of quenching of the lanthanide excited state. Systems exhibiting each of these…
Mesoporous semiconducting films consisting of preferentially orientated monoclinic-phase nanocrystals of tungsten trioxide have been prepared using a novel version of the sol-gel method. Transformations undergone by a colloidal solution of tungstic acid, stabilized by an organic additive such as poly(ethylene glycol)…
The crystal structure of borophosphates ABPO 5 (A = alkaline earth or Pb) was resolved on a polycrystalline sample using the Rietveld method. The x-ray diffraction patterns data show that ABPO 5 crystallize in a centrosymmetric space group P3 1 21 and their structure is related to the borogermanates REBGeO 5 with a st…
Abstract The crystallization kinetics and morphologies of dilute binary blends of the monodisperse alkane n ‐C 122 H 246 in n ‐C 246 H 494 and vice versa have been investigated. With a molecular length ratio close to two, this pair of n ‐alkanes does not produce permanent cilia when once‐folded C 246 H 494 molecules c…
We present and analyse high-resolution absorption, luminescence and upconversion-luminescence spectra of Cs 2 GeF 6 : 2% Re 4+ . The crystals of Cs 2 GeF 6 : 2% Re 4+ were grown from solution. Upon excitation around 11 000 cm −1 in the near infrared, visible upconversion luminescence around 17 000 cm −1 is observed. O…
The phase transition of ferroelectrics is one of their most important bulk-nature attributes. In well-epitaxial ferroelectric thin films, the crystal structures are highly strained and the ferroelectric phase transitions tend to dissappear because of an epitaxial effect. We investigated the epitaxial effect by structu…
In this paper, our work is focused on the fundamental combustion characteristics of the combustibles in MSW and its kinetic model. The combustion reactivity of the different combustibles in MSW and their mixtures such as TG and DTA profiles were studied by thermogravimetry (TG) and differential thermal analysis (DTA).…
A brief review is given of the Post symmetries and constraint for covariant electromagnetic constitutive relations which are linear in the fields E and B . Their extension to non-covariant constitutive relations which are linear also in space and time derivatives of E and B is discussed. The Post constraint is compare…
The segregation effects of Nb and V on bcc FeSigma3[110](111) grain boundary cohesion are studied by the first-principles DMol method within the framework of density functional theory. The calculated segregation energy difference between the grain boundary and the corresponding free surface is -0.51 eV (-0.58 eV) for…