Materials Literature
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The calculation of the partition function for a simple one-dimensional order-disorder model is reduced to the solution of a certain functional equation. This equation is solved rigorously and it is shown that in the limit of indefinitely long-range interactions the model exhibits a finite discontinuity in the specific…
The self-diffusion of alkali ions in alkali silicate glasses is discussed in terms of the formation, migration, and ultimate annihilation of defects. These defects exhibit a combination of the properties exhibited by Frenkel defects in alkali halides and Bjerrum defects in ice, and are treatable by many of the analyti…
The ratio of the flow stress at a high temperature to that at O°C has been measured for polycrystalline Al and Cu, and for single crystals of Al. In Al the flow stress decreases ratio strongly with temperature above a certain critica1 temperature (about 250°C). In Cu a similar but more gradual decrease in the flow str…
A study has been made of the internal fields acting on ${\mathrm{Fe}}^{57}$ nuclei in some spinel ferrites, with particular reference to the low-temperature order-disorder transition in magnetite, using the techniques of M\"ossbauer absorption. For the ${\mathrm{Fe}}^{3+}$ ions at both the octahedral and tetrahedral s…
The Stark splitting of the identified levels of Nd+3 in LaCl3 were calculated by first-order perturbation. Intermediate coupling wave functions and crystal-field interaction parameters reported by Judd were used. The calculated spectrum agrees with the spectrum observed by Carlson to 5 cm—1.
The characteristic equation determining the eigenfrequencies of the magnetostatic modes is derived from the equations of motion and the boundary conditions. The solutions may be classified as pertaining to surface and to volume modes. Surface-mode solutions exist only for sufficiently small wave numbers, and their eig…
MIXED OXIDES OF TITANIUM AND NIOBIUM. I distances 1. 95 and 2.76 A between metal and anion, anion and anion respectively in Nb02F; Vousden (1951) 2.00 and 2.82 A for KNbOs, 1.95 and 2-76/~ for NaNb0s; BystrSm's (1944) data for the pyrochlor structure, based upon indirect methods, is not included.
The effect of pressure from 60 to over 400 kbar has been measured on the resistance of selenium and iodine. Selenium exhibits a very rapid drop in resistance between 60 and 128 kbar; at 128 kbar it shows a discontinuous drop. At higher pressures its behavior is apparently metallic. Iodine shows a rapid drop in resista…
The thermal conductivity of single crystals of Ca${\mathrm{F}}_{2}$, Mn${\mathrm{F}}_{2}$, Co${\mathrm{F}}_{2}$, and Zn${\mathrm{F}}_{2}$ has been measured over the temperature range from 3\ifmmode^\circ\else\textdegree\fi{}K to 300\ifmmode^\circ\else\textdegree\fi{}K. In this series, Ca${\mathrm{F}}_{2}$ and Zn${\mat…
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Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text Roger C. Millikan, "Optical Properties of Soot," J. Opt. Soc. Am. 51, 698-699 (1961) Export Citation BibTex Endnote (RIS) HTML Plain Text Citation aler…
A perturbation expansion in powers of ${{r}_{s}}^{\ensuremath{-}\frac{1}{2}}$ has been used to investigate the ground-state energy of a dilute electron gas, the result being, in rydberg units per particle, $E=\ensuremath{-}\frac{1.792}{{r}_{s}}+\frac{2.66}{{{r}_{s}}^{\frac{3}{2}}}+\frac{b}{{{r}_{s}}^{2}}+O(\frac{1}{{{…
Samples of TiO 2 of various colours (bluish black to yellowish white) were obtained by heating TiO2 at 1400 C. under oxygen of increasing pressure. At that temperature the dissociation pressure is about 2/3 arm. (in oxygen). The homogeneity region of the phase extends from about TiO~.gsa to TiO2.000 (39.845 to 40.05%…
In laboratory trials on samples from individual fleeces solvent degreasing has shown a higher yield than aqueous alkaline scouring. Differences of 0.5% to 1.4% of clean dry fiber are found when solvent degreasing is compared with traditional soap-soda scouring. Evidence is presented showing that the difference in yiel…
Abstract Extensive fatigue tests of vulcanizates of natural rubber and SBR were carried out using a cycle of alternate stretching in two perpendicular directions. It is shown that the data can be best handled statistically by assuming a lognormal distribution or by the use of extreme probability techniques. Illustrati…
Samples of polydivinylbenzene (PDVB) and of copolymers of styrene with divinylbenzene (DVB) and with trivinylbenzene (TVB) were pyrolyzed in a vacuum in the temperature range of 346 to 450 °C. The volatile products were collected in two fractions: A heavy fraction volatile at the temperature of pyrolysis and a light f…