Materials Literature
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We have studied the magnon and phonon spectra of R${\mathrm{FeO}}_{3}$ crystals with R${=\mathrm{}}_{39}$Y, $_{65}\mathrm{Tb}$, $_{66}\mathrm{Dy}$, $_{67}\mathrm{Ho}$, and $_{69}\mathrm{Tm}$. The temperature dependence of q\ensuremath{\rightarrow}\ensuremath{\sim}0\ensuremath{\rightarrow} magnons is examined near the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal and oxidative degradation of poly(methyl methacrylate) molecular weightTakashi Kashiwagi, T. Hirata, and J. E. BrownCite this: Macromolecules 1985, 18, 2, 131–138Publication Date (Print):February 1, 1985Publication History Published online1 May 2002Published inissue…
The evidence for the presence of the pyrrole moiety in electro-chemically prepared polypyrrole is reviewed together with structural and IR data obtained for the crystalline dimer and trimer of pyrrole. The modification of the mechanical properties of polypyrrole by formation of graft copolymers with polystyrene, by po…
The ability of small drops or bubbles to stick to non-horizontal solid surfaces is analysed. The principal results consist of identifying the critical value of the volume of a drop (or bubble) beyond which it will dislodge and move down (or up) the surface of the solid, and determining the speed at which it will move.…
Tourmaline, a mineral often overlooked in petrological studies, is shown to be a useful petrogenetic indicator mineral.-J.A.Z.
A new direction in the field of x-ray optics is discussed. This new direction is associated with diffraction at grazing angles of incidence and diffraction; it is associated with the excitation of x-ray surface waves and quasiwaveguide modes, and with the study of the angular and energy dependences of the reflection s…
Influence of structure defects on the internal optical strength of KDP single crystals, V V Azarov, L V Atroshchenko, Yu K Danileĭko, M I Kolybaeva, Yu P Minaev, V N Nikolaev, A V Sidorin, B I Zakharkin
Based on the analysis of higher-order Laue zone diffraction by Bird (1985), the structure of the commensurate superlattice state of 2H-TaSe 2 is determined by convergent-beam electron diffraction. It is shown that the most general displacements allowed by the orthorhombic space group can be described by a set of displ…
This article discusses some basic principles that underlie design of effective armour materials against various modes of attack.
Auger satellites have been measured to determine the probability of $M$-shell excitation accompanying $K$-shell photoionization of Ar, as a function of photon energy. The theoretically predicted difference between the dependence of shakeup and shakeoff probabilities on the photon energy near threshold is demonstrated…
Photoinduced excess charge at a GaAs interface barrier relaxes nonexponentially. A fit to experiment with a statistically motivated Kohlrausch formula is possible but unjustified. Serial relaxation by hierarchies of systems with increasing spatial separation of carriers furnishes a convincing explanation and exemplifi…
The authors discuss the experimental results on radiation damage of NaCl single crystals in terms of the Jain-Lidiard model. This model has been improved by taking into account the back reaction between F centres and Cl 2 molecules. It appears that with this extended Jain-Lidiard model they can describe quantitatively…
A high-temperature X-ray diffraction study on a Co75Sn25 alloy reveals it as a mixture of two phases, the f.c.c. solid solution β-Co(Sn) and the intermetallic phase γ-Co3Sn2. The lattice parameters of β-Co(Sn) and of γ-Co3Sn2 in the two-phase alloy Co75Sn25 are determined within the temperature range from 500 to 1050…
The oxidation of tin-oxide thin films is studied by electron microscopy and diffraction. Cassiterite, the rutile-like form of SnO2, is formed during oxidation of amorphous films deposited on the carbon precoated substrates, while a new form of SnO2 with the structure of brookite is obtained if the epitaxial films of α…
Near resonant Raman scattering in highly purified NaNO 2 crystal has been investigated in changing the exciting photon energy ν i in the region near the zero-phonon line at ν 00 of the singlet absorption. A significant change in the scattering due to ν 2 vibration of NO 2 - in b ( a , a )\bar b configuration occurs as…
It is demonstrated that the thermally stimulated currents (TSC) from positively or negatively corona-charged polypropylene strongly depend on the order of the following two processes: a process of vacuum deposition of Al electrodes on the sample polymer and a process of heat-treatment of the polymer. Observed results…
The threshold values for the field-induced cholesteric to nematic phase transition are described as crossover points of the free energy levels of the textures concerned. Known expressions for these energy levels as a function of an electric field are extended with a surface interaction term. By interpretation of exper…
Surface chemical states were studied for Zr and Nb metals exposed to 8-keV hydrogen molecular ions. X-ray photoemission spectroscopy (XPS) measurements revealed that chemical shifts of the binding energies for the ion-implanted Zr from the metallic states are 0.6--1.4 eV, consistent with the core-line shifts for therm…
In a study of the low-temperature anomalies which appear in disordered solids we have measured the specific heat, thermal conductivity, thermal expansion, and dielectric dispersion for a carefully prepared series of (${\mathrm{SiO}}_{2}$${)}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$(${\mathrm{K}}_{2}$O${)}_{\mathrm{x}}$ a…
Variable oblique alignment of nematic liquid crystals has been achieved on microscopically inhomogeneous surfaces. The surfaces consist of small patches favoring vertical (homeotropic) alignment surrounded by a matrix favoring a planar alignment. The construction of these surfaces employs randomly distributed microsco…