Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPathways of radiative and radiationless transitions in europium(III) solutions. The role of high energy vibrationsYehuda Haas and Gabriel SteinCite this: J. Phys. Chem. 1971, 75, 24, 3677–3681Publication Date (Print):November 1, 1971Publication History Published online1 May…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPathways of radiative and radiationless transitions in europium(III) solutions. Role of solvents and anionsYehuda Haas and Gabriel SteinCite this: J. Phys. Chem. 1971, 75, 24, 3668–3677Publication Date (Print):November 1, 1971Publication History Published online1 May 2002Pub…
Electromagnetic radiation approximately equal to band-gap energy has been established as responsible for the dissociation of amorphous As2Se3 and As2S3. The dissociation is accompanied by an optical densification observable as a ``photographic'' effect in thin films of these materials. The dissociation can be expresse…
An apparatus based on Bridgman's bellows method, originally devised for fluids, has been constructed for use with solid samples. Mercury is employed as the confining liquid. The operating range is 0≤t≤200 °C and 1≤P≤2000 bar. Calibration with benzene and mercury shows an accuracy of ±2×10−4 cm3/g in the measurement of…
The time dependence of the luminescence decay following pulsed excitation is examined for a system in which excited paramagnetic ions decay by a combination of intrinsic relaxation processes, direct energy transfer to acceptor ions, and energy migration. Three limiting cases are considered: direct energy transfer in t…
The dielectric permittivity and the dielectric loss factor of 5-methyl-3, 4-methyl-3 and 3-methyl-3-heptanol, n- and iso-butanol, 1,2-propanediol, dimethyl and diethyl phthallate, and 3-methylpentane have been measured from 50 to 105 Hz and from −196 to about 20°C above their respective glass transition temperatures.…
Laves phase compounds Zr(Fe, Co) 2 have MgCu 2 structure and Zr(Fe, Mn) 2 change the structure from MgCu 2 type to MgZn 2 type with composition change. Both compounds change from ferromagnetism to paramagnetism with decreasing Fe content and the magnetic moment of Fe, Mn, Co decrease from 1.62, 0.62, 0.62 µ B to zero.…
The thermal conductivities of three single crystals of BeO have been measured from 2 to 300 K. Phonons carry the heat at all temperatures. At 300 K the conductivity is 3.7 W/cm K, which is slightly less than that of copper. In the purest sample the maximum conductivity occurs at 45 K where it is 137 W/cm k, and at tem…
A lattice model of adsorption of an isolated chain polymer between two plates is investigated using a matrix formalism and a grand canonical ensemble (GCE) formalism. The matrix formalism is particularly convenient for calculating the polymer segment density as a function of the distance from one of the plates for dif…
A study is made on the dispersions of resistivity and dielectric constant of α-Fe 2 O 3 , γ-Fe 2 O 3 , Fe 3 O 4 , Zn ferrite, Mn ferrite, and MnZn ferrite fine particles over the frequency range of 10 Hz to 1 MHz in the temperature range from 77°K to 300°K. The Maxwell-Wagner interfacial polarization arising from the…
The application of the metal–semiconductor boundary layer theory to the study of the catalytic properties of supported metal catalysts is discussed. Published work on the structure of very small metal crystals and on anomalous adsorption and catalytic centres in such crystals is discussed with particular reference to…
The chemical consequences of the mechanical treatment of inorganic solids has recently become the subject of detailed studies arising from increasing mechanical loading and the development of a highly effective technology of size reduction. The present review of published data examines the influence of mechanical trea…
Exploration of the generality of the recently discovered reaction whereby certain organic molecules can be inserted between the metallic layers of the superconductors tantalum disulfide and niobium disulfide revealed that a large variety of organic and inorganic molecules can penetrate between the crystalline layers o…
The voltage dependence of the surface conduction current in pure and oxidized polyethylene has been investigated at various relative humidities and at room temperature. The surface conductivity of pure polyethylene has been confirmed to be less than 10 -19 mho at near saturated water vapour pressure at 25 degrees C. I…
Polycrystalline ferrites of compositions NiFe 2-x Mn x O 4 with x=0.02 and 0.05 were obtained by a conventional ceramic technique. Neutron diffraction measurements of the oxygen parameter u and X-ray diffraction measurements of the cell dimension a of the samples are presented. The u parameter of either sample is not…
Single crystals of ${\mathrm{K}}_{2}$Pt${(\mathrm{CN})}_{4}$${\mathrm{Br}}_{0.3}$\ifmmode\cdot\else\textperiodcentered\fi{}${({\mathrm{H}}_{2}\mathrm{O})}_{n}$ show a Drude-type optical reflectivity for light polarized parallel to the crystal axis. The energy of the plasma edge indicates a metallic density of free car…
Six measurements of $^{114}\mathrm{In}$ diffusion in single crystals of 99.999% pure Al have been made in the range 440-660 \ifmmode^\circ\else\textdegree\fi{}C. A least-mean-squares analysis of the data leads to the expression $D=1.16{e}^{\frac{\ensuremath{-}(1.27\mathrm{eV})}{\mathrm{kT}}}$ ${\mathrm{cm}}^{2}$${\mat…
The difficulty of making electrical contact to, and obtaining meaningful data from, strongly anisotropic layer structures is discussed and clarified for MoS 2 . An analysis of this anisotropy is presented and used to explain experimental results obtained from natural crystals of molybdenite.It is shown that annealed c…
Two experiments of the successive vaporization type, five mass spectrometric vaporization experiments, and two isomolecular exchange reaction experiments were undertaken to resolve discrepancies in the thermodynamics of the titanium—oxygen system. The first two types of experiments confirmed that Ti3O5(s) is the congr…
Neutron double-differential cross sections of four polycrystalline samples of $\mathrm{Zr}{\mathrm{H}}_{x}$ with hydrogen-to-zirconium ratios ($x$) of 0.54, 1.03, 1.56, and 2.00 have been measured with high-energy resolution by downscattering of neutrons from initial energies of 171.5 and 244.8meV. Clear evidence of s…