Materials Literature
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Abstract The various modes of specimen signal acquisition presently available on the scanning electron microscope permit both morphological and analytical studies to be carried out on the specimen. The advantage of the scanning electron microscope is that it provides an information-rich image at resolutions determined…
Abstract Unter verschiedenen Zustandsbedingungen wurde die Temperaturabhängigkeit der thermischen Schädigung von Nylon 6.6 und Nylon 6.10 vergleichend untersucht. Die erheblich größere thermische Unbeständigkeit von Nylon 6.6 läßt sich auf die Ringschlußtendenz des Adipinsäurebausteines zurückführen. In Gegenwart von…
Abstract A scanning microscope is described which is capable of a point resolution of 0.5 nm. We have demonstrated that it can produce the same kinds of micrographs as a conventional microscope. However, by using several detectors to produce signals corresponding to different groups of transmitted electrons we are abl…
An anomalously large magnetostriction has been found in ${\mathrm{Fe}}_{2}$Ti${\mathrm{O}}_{4}$. The magnetostriction constants ${\ensuremath{\lambda}}_{100}$ and ${\ensuremath{\lambda}}_{111}$ are (4.7 \ifmmode\pm\else\textpm\fi{} 0.4) \ifmmode\times\else\texttimes\fi{} ${10}^{\ensuremath{-}3}$ and (1.3 \ifmmode\pm\e…
First measurements of double-photon elastic scattering performed on liquids with centrosymmetric molecules yield good agreement with statistical molecular theory of nonlinear light scattering. Studies of this new scattering are shown to allow determination of the third-order molecular polarizability as well as its ani…
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…