Materials Literature
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The thermal conductivity of two single crystal samples of the transition metal dioxide RuO2, is measured in the temperature range 2 to 47 K. The relationship of electrical and thermal conductivity is considered. At temperatures below 5 K the electron-impurity scattering is dominating and the Lorenz ratio is in accorda…
The ionic conductivity of ceramic GdxZr1–xO2–x/2 and NdxZr1–xO2–x/2 solid solutions is measured as a function of composition. Both solid solutions are of the defect fluorite type and the fluorite-related ordered pyrochlore phase is present around the stoichiometric compositions Gd2Zr2O7 and Nd2Zr2O7. As a function of…
ElJects of chemical compositions on the season cracking, which occurs in melastable allstenilic stainless steel ajier deep drawing, were sludied.The main results obtained in this study are as follows.(1) T he sensitivity 10 the season cracking is 1101 determined Ollly by Ihe I'Dlume fraclion of slrain•induced marlClls…
QMSCC calculations have been performed on the thermal quenching of the uranate luminescence in perovskite-type compounds with compositions A2BW0.997U0.003O6(A2B=Ca2Mg, Sr2Mg, Ba2Mg, Ba2Ca, Ba2Sr or Ba2Ba). Using a three states SCC model the luminescence quenching could be described quantitatively. The model was checke…
The immune status of 29 pigs recovered from swine dysentery (SD) was evaluated after reexposure to Treponema hyodysenteriae. Pigs which had recovered from SD and remained asymptomatic for 4 to 6, 9 to 13, and 16 to 17 weeks after initial inoculation were reexposed to 1.5 X 10(9) viable cells of T hyodysenteriae per pi…
Fly ash samples from two different generating plants have been examined by laser light scattering techniques. Individual particles below approximately 3-microm diam, found to be primarily spherical, were electrostatically levitated in a single-particle light scattering photometer while their differential light scatter…
The effect of pressure to 120 kbars has been measured on the luminescence efficiency of La2O2S:Eu and Y2O2S:Eu in concentrations from 0.1% to 3% europium. Lifetimes were also measured for the lanthanum compounds. For La2O2S:Eu the emissions from 5D0 and 5D1 decreased in intensity with increasing pressure; the very wea…
A new class of organic polymeric thin-film electrochromic materials is described. We show that the new polymer-modified electrodes change color reversibly in permanent thin-film form without the electrodeposition characteristics of organic liquid state systems such as the viologens. The polymer films exhibit good swit…
It is shown that a binary solid solution under irradiation may become unstable when vacancy-interstitial mutual recombination takes place, while it would be (linearly) stable in the absence of recombination, for the same average defect concentration. The general conditions for this to occur are elucidated and are not…
Optical measurements of smectic A layer spacings in freely suspended thin films of three liquid crystals are reported. Although the measured spacings are close to those reported for the bulk, some anomalous behavior is noted. In addition, we report that the smectic A phase in the film can exist at unusually high tempe…
Dielectric constants were measured for the pseudo-hexagonal c -plates of K 3 H(SO 4 ) 2 , Rb 3 H(SO 4 ) 2 , and their deuterated analogues below room temperature. The dielectric constants of K 3 H(SO 4 ) 2 and Rb 3 H(SO 4 ) 2 monotonically increase with decreasing temperature down to 4.2 K showing no anomalies corresp…
We report results of measurements of electrical conductivity, thermoelectric power, and Hall effect on single crystals of $\mathrm{Ni}{\mathrm{S}}_{2\ensuremath{-}x}{\mathrm{Se}}_{x} (0.1\ensuremath{\le}x\ensuremath{\le}1.5)$. These results cannot be understood using the one-electron approximation but are explained qu…
Ultraviolet and x-ray-photoelectron spectra of core and valence levels in U metal, UN, U${\mathrm{O}}_{2}$, Th, and ThN have been obtained. These spectra demonstrate the existence in uranium nitride of a sharp band of $f$ states (containing 2.2\ifmmode\pm\else\textpm\fi{}0.5 electrons) at the Fermi level. The anomalou…
Exposure of single crystals of Mg${\mathrm{Al}}_{2}$${\mathrm{O}}_{4}$ to fast neutrons and to Van de Graaff electrons with energies in excess of 0.35 MeV introduces an optical-absorption band at 5.3 eV with a 1-eV half-width. This band can be partially bleached at temperatures as low as 40 K and a shoulder at 4.75 eV…
X-ray and ultraviolet photoelectron spectroscopy (XPS and UPS) have been used in a study of the electronic structure of iodine-doped polyacetylene. Core level and valence band spectra are used to assess the nature and the consequences fo the iodine doping. The spectra are compared with our previous results on pure and…
Solitons in a one-dimensional charge-density-wave system with half-filled electron bands are studied theoretically with a continuum model. This model is a continuum version of the one of polyacetylene recently considered by Su, Schrieffer, and Heeger (SSH). We have analyzed a variational solution with the displacement…
Abstract The electronic ground state of Tm3+, 3H6, is a non-Kramers doublet which, below a critical temperature TD, is split by a cooperative Jahn-Teller distortion. Radiofrequency measurements of the susceptibility have established that (a) TD = 2.156(5) K; (b) most of the magnetic specific heat above TD comes from r…
The photoemission of Cr films deposited under UHV conditions has been investigated in the photon energy range from 30 eV to 230 eV. The 3p-3d intershell interaction gives rise to a strong maximum in the 3d partial yield above the 3p threshold.
The electronic structure and vibrations of an adsorbed hydroxyl (OH) species are identified and characterized for the first time on a transition-metal surface. In this study of water's interaction with clean Pt(111) in ultrahigh vacuum, water adsorbed at 100 K desorbs at 180 K without appreciable dissociation. However…
Abstract The photoredox behaviour of two water soluble derivatives of zincporphyrin, 5,10,15,20‐tetra‐ p ‐sulfonatophenyl ( 1 ) and 5,10,15,20‐tetra‐p‐ N ‐methylpyridiniochloride ( 2 ), was investigated using laser and continuous photolysis techniques. Photoexcitation produces triplet states whose lifetimes in aqueous…