Materials Literature
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Generalized relations between the strength distribution function and derivatives of the fracture probability are developed for five widely used testing methods for measuring the strengths of ceramic materials. The derived relations for three of these methods are used to analyze room‐temperature fracture strength data…
A systematic investigation was made of magnetostriction and magnetization in amorphous thin films (∼1 micron) of TbxFe1−x with x=0 to 0.5 prepared by electron-beam co-evaporation. The amorphous or crystalline character of the films was determined using x-ray and Mössbauer techniques. Net magnetization, coercivity, and…
An in vivo method is described for screening polymeric materials for biocompatibility. The test is based on grading acute and subacute tissue reactions at 7 and 28 days, respectively, following implantation in rats. The methods is reproducible and reliable. It is designed to provide uniform test criteria for biocompat…
Adsorption isotherms of N2 on graphite have been studied in great detail in a coverage range corresponding to the transition between the fluid and the registered monolayer. This transition is first order up to a temperature of about 82 K. An adsorption isotherm at 84.69 K shows that the methane monolayer also changes…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTwo-photon spectroscopy of the visual chromophores. Evidence for a lowest excited 1Ag--like .pi..pi.* state in all-trans-retinol (vitamin A)Robert R. Birge, James A. Bennett, Brian M. Pierce, and Terry M. ThomasCite this: J. Am. Chem. Soc. 1978, 100, 5, 1533–1539Publication…
The EHS sarcoma (named after its discoverer, Engelbreth‐Holm, and its primary characterizer, R. Swarm) contains an extracellular matrix of basement membrane. The collagenous component of the membrane was extracted with dilute acetic acid from tumors grown in lathyritic mice and separated from other proteins by chromat…
A theory is presented which explains the spin-flip transition in chromium in terms of coupling to the spontaneous strain. The spin density wave is treated in a Landau formulation and both spin-independent electron-strain coupling and magnetostriction couple the strain to the spin density wave. This coupling explains t…
Slow strain rate tensile tests of forging brass in standard mercurous nitrate solution have been used to find the minimum stress necessary to propagate a crack. Comparison with constant load tests in HgNO3 and also in Mattsson's (NH4)2SO4-CuSO4 solution have verified that the threshold stress can be found rapidly by a…
57Fe Mössbauer spectroscopy has been used to determine the degree of orientation and magnetic hyperfine fields in SrFe12O19 ceramic compacts with known bulk magnetic properties. The controversy regarding the assignment of the spectrum to the different sites has been resolved and at 300 K the hyperfine fields for the 4…
The intrinsic magnetic properties of VSe2 in the incommensurate and commensurate charge denity wave states have been examined by magnetic susceptibility and NMR observations. VSe2 synthesized at high temperatures is slightly metal-rich and since the excess vanadium atoms are magnetic, their contribution to the magneti…
Abstract XRD, DTA and IR patterns showed clay veins filling fissures in a granite of the Bayerischer Wald (eastern Bavaria) to consist mainly of hydrated halloysite of low crystallinity with traces of gibbsite, 2:1 (mixed layer) clay minerals and iron oxides. The halloysite forms thin plates which exhibit varying degr…
Sulfur concrete may be attained with a compressive strength of approximately 1200 kp/cm 2 by using 3 wt % DCP-modified sulfur as binder and defined grain size distributions for aggregates. Microscopic examinations of thin polishes show the importance of optimally composed aggregates to the strength of sulfur concretes…
Eu1/2Ba1/2TiO3 was prepared with the intent of building both ferromagnetism and ferroelectricity into the same crystal lattice. Ceramic samples prepared at 1500 °C exhibit a magnetization of 59 emu/g at 1.8 °K and 5 kOe applied field. Possible crystallographic ordering of Ba2+ and Eu2+ ions is thought to permit positi…
The results of six crystal structure refinements of K2[Pt(CN)4]X0. 3. 3H20 with X = Br, C1 (KCP) from X-ray and neutron diffraction measurements between 31 K and room temperature are presented and compared. Particular subjects of the discussion are the parameters of the [Pt(CN) 4] groups, the distribution of the water…
Liquid sulfur—dicyclopentadiene (DCP) solutions at 140°C undergo bulk copolymerization where the melt viscosity and surface tension of the solutions increase with time. A general melt viscosity equation: η = η 0 exp(aX b t), at constant temperature, has been developed, where η is the viscosity at time t for an S 8 -DC…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMoessbauer-Zeeman spectra of some octaethylporphyrinato- and tetraphenylporphinatoiron(III) complexesDavid H. Dolphin, John R. Sams, Tsang Bik Tsin, and Kit L. WongCite this: J. Am. Chem. Soc. 1978, 100, 6, 1711–1718Publication Date (Print):March 1, 1978Publication History P…
The development of domain theory and micromagnetics from the early 1930’s to the present is reviewed and assessed, with emphasis on the developments of particular interest to the author.
The diffuse scattered X-ray intensity close to several reciprocal lattice points (hh0) was measured at room temperature in single-crystal Ta-H alloys. The displacement field of dissolved hydrogen in Ta can be treated as a linear superposition of single-defect fields even at concentrations as high as c(H/Ta)=0.111. In…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilver iodide based solid electrolytesSeymour GellerCite this: Acc. Chem. Res. 1978, 11, 3, 87–94Publication Date (Print):March 1, 1978Publication History Published online1 May 2002Published inissue 1 March 1978https://pubs.acs.org/doi/10.1021/ar50123a002https://doi.org/10.1…
A numerical model was developed to compute the temporal and spatial variations of the detailed micromagnetic structures of domain walls by numerical integration of the Landau-Lifshitz-Gilbert equation. Fundamental interactions due to anisotropy, exchange, and demagnetization are included. Preliminary results for the s…