Materials Literature
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The specific heat of YbFe${\mathrm{O}}_{3}$ in the range 1.5-15 K exhibits spin-reorientation and Schottky anomalies. The magnetic field dependence of the reorientation anomalies is consistent with phenomenological descriptions which predict that two second-order phase transitions occur in the reorientation process. T…
A novel application of the Born-Oppenheimer approximation is made which predicts the strength and nature of the singular threshold structure associated with plasmon satellites for a wide class of experiments involving the interactions of photons or fast electrons with solids.
The crystal structure and internal defects of equiatomic TiNi martensites have been studied using the techniques of electron microscopy, electron diffraction, and X-ray diffraction. The crystal structure may be described as of distorted B19 type with a monoclinic unit cell, the lattice parameters of which are a = 2.88…
High values of electro-optic coupling and second-harmonic generation coefficients have been found in m-nitroaniline; Miller's Δ coefficients are higher than any previously reported. The shape of the absorption band rather than a favorable bond-orientation geometry appears to be responsible.
Raman spectra of aqueous gadolinium nitrate solutions, and complementary infrared spectra, have been obtained for a wide range of compositions. Detailed intensity analyses indicate that the predominant species in solutions with nitrate:gadolinium ratios less than two is Gd(NO3)2+ (β2 = 4.6 ± 0.2 at 25°C). Small concen…
Dielectric constants and refractive indices of a 5PbO · 3GeO2 crystal, which was grown from the melt by by the Czochralski method, were measured as a function of temperature. The crystal was identified as a new type of ferroelectric with spontaneous polarization Ps = 0.046 C/m2, coercive field Ec ∼ 2.3 × 106 V/m at ro…
Magnesium orthovanadate crystallizes in the orthorhombic space group Cmca with a = 6.053(3), b = 11.442(6), c = 8.330(3) Å, and Z = 4. The structure was refined by full matrix least square methods to a final R value of 0.047 using 1697 reflections measured by a quarter circle General Electric automatic diffractometer.…
It is shown that atomic displacements $\stackrel{\ensuremath{\rightarrow}}{\mathrm{A}}sin\stackrel{\ensuremath{\rightarrow}}{\mathrm{Q}}\ifmmode\cdot\else\textperiodcentered\fi{}\stackrel{\ensuremath{\rightarrow}}{\mathrm{L}}$ associated with a charge-density wave (CDW) modulation of a metal crystal cause several chan…
The phonon dispersion relation for rutile (Ti${\mathrm{O}}_{2}$) has been measured by the coherent inelastic scattering of thermal neutrons along principal symmetry directions of the Brillouin zone. Theoretical models based on rigid-ion and shell models, with either axially symmetric or tensor first- and second-neighb…
Quadratic elongation and the variance of bond angles are linearly correlated for distorted octahedral and tetrachedral corrdination complexes, both of which show variations in bond length and bond angle. The quadratic elongation is dimensionless, giving a quantitative measure of polyhedral disortion which is independe…
Report No. HE-70-4, 1970 (unpublished}.In Fig. 1 the data from the latter reference are used.They are not corrected for secondary productions, which are accounted for in the former reference, but unfortunately in a model- dependent calculation.The general energy dependences of o"and (n) are not affected.4A comparison…
In-pile fission gas release from nearly stoichiometric sintered uranium monocarbide was measured in the temperature range from 1,650° to 2,030°C. The result was analyzed on the basis of the diffusion model, from which the diffusion coefficient of krypton in uranium monocarbide was derived as D=1.6×10−7 exp(–56,400/RT)…
Abstract Thermomagnetic transport parameters have been measured in bismuth at 80 °K and found to be strongly pressure‐dependent. Results indicate that in addition to a decrease in the energy overlap, E 0 , there is an increased participation of a light hole band increasing the mobility of holes. The Nernst effect and…
Dando seqüência ao estudo do bambu como matéria-prima para as indústrias de celulose e papel, foram determinadas as características tecnológicas de quatro espécies tropicais exóticas, com bom desenvolvimento nas condições ecológicas do Estado de São Paulo. Em cozimentos efetuados pelo processo sulfato constataram-se d…
Abstract An analytical technique based on the method of least squares has been developed to fit experimental second virial coefficients to the functional form derived from the Lennard‐Jones (6–12) potential. Both the functional form and the normal equations of the least squares fit are rigorously derived. Because of t…
Phase relations in the system NaAlSi 3 O 8 – NaAlSiO 4 – H 2 O up to ~15 Kb have been discussed from a theoretical standpoint. The discussion is based on the equilibrium compositions of invariant phases. Two new invariant points, I 5 and I 6 , have been predicted: I 5 at ~13 Kb/~500 °C where five phases, jadeite, neph…
Five anhydrogalactose-containing polysaccharides have been extracted in high yields with hot water and dilute alkali from Gloiopeltis furcata and purified by precipitation with cetylpyridinium chloride and by some chromatographic techniques. The analytical results showed that they all contained galactose, 3, 6-anhydro…
The lattice parameters of UC2 are examined as a function of carbon content and annealing: conditions on sintered carbides between UC1·5 and UC2·2 (7.0 to 10.0W/0 of carbon). The values of UC2 obtained under equilibrium state are around a 0=3.5253 Å and c 0=5.9994Å. The lattice parameter measurements were made also on…
The types of high-voltage direct-current (HVDC) system configuration and the detrmental effects that this type of transmission can have on its surroundings are summarized. Discussed in detail are the test procedures followed and camred out to determine some of the effects on a major pipeline by simulated conditions, f…
The reflection, transmission, optical activity, and extinction ratio of a series of mixtures of cholesteryl oleyl carbonate, cholesteryl nonanoate, and cholesteryl chloride of different proportions were measured. The wavelength of minimum transmission (lambda(o)), maximum rate of change of optical activity, and minimu…