Materials Literature
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Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans the biological, physical, and social sciences.
The creep ductilities of irradiated Hastelloy N at 650°C have been determined at several neutron exposures. Elevated-temperature irradiation embrittlement greatly reduces the stress-rupture strength as measured in postirradiation uniaxial stress tests. The reduction in ductility to values as low as 0.4% is due to an i…
A liquid-helium object stage for the electron microscope has been used to observe directly magnetic domains in CrBr3, an ionic ferromagnet with a Curie point of 36°K. Some of the contrast effects observed are typical of the magnetic-domain wall observations made by Lorentz microscopy on materials such as Co which are…
A method is suggested to detect directly the deionization margin angle and to prevent the commutation failure of an inverter. The deionization margin angle is detected by anode- cathode voltage of a valve and ac phase voltage. The method to prevent the commutation failure, namely the one to hold the critical deionizat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConductances of some uni-univalent electrolytes in adiponitrile at 25.degree.Paul G. Sears, Joseph A. Caruso, and Alexander I. PopovCite this: J. Phys. Chem. 1967, 71, 4, 905–909Publication Date (Print):March 1, 1967Publication History Published online1 May 2002Published ini…
Summary Gersdorffite belongs to space group P 2 1 3 in the cubic system with cell dimension a 5·6885 ± 0·0003 Å and four formula units per cell. The hk 0 data were measured from precession photographs obtained with Mo- Kα radiation. The structure was solved by Patterson methods and refined by least-squares techniques.…
Single crystals of BaZnFe6O11 (Zn Y) were grown by the flux technique. Chemical analysis showed the presence of some ferrous ions in most batches. A relation between the Curie temperature and the ferrous content could be established. The anisotropy in the specific resistivity was measured (20–260 Ω·cm in the basal pla…
Abstract The concentrations and the growth rates of high‐ and low‐melting type spherulites of trans ‐1,4‐polyisoprene were measured in the temperature range 39–49°C. It was shown that above about 40°C., the crystallization rate of trans ‐1,4‐polyisoprene is determined primarily by the radial growth rate of high‐meltin…
Abstract Some crystalline organic compounds containing a β‐naphthyl group stiffen rubbers considerably. This paper discusses the dynamic behavior of these systems when subjected to oscillatory strain of increasing amplitude. Modulus–strain amplitude plots similar to that in carbon black–natural rubber systems are obta…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReduction of epoxides. II. The lithium aluminum hydride and mixed hydride reduction of 3-methylcyclohexene oxideBruce Rickborn and Wallace E. Lamke IICite this: J. Org. Chem. 1967, 32, 3, 537–539Publication Date (Print):March 1, 1967Publication History Published online1 May…
To test the applicability of the phenomenological theory of linear viscoelasticity, stress relaxation and dynamic mechanical properties are measured on oriented nylon 66 fibers and compared with previously reported creep data. Although the three types of viscoelastic experiments are performed on slightly different sam…
The pse udobinary sys tems Ti02-1rO, and Sn02-lr02 we re studied by x-ray diffraction after treatm e nt at vari ous te mpe ratures in air. Their equilibrium ph ase di agrams we re similar, with no int erm edi ate phases detec ted in eithe r sys tem. Max imum so lid so lution of Ti02 occ urs with th e additi on of abou…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereochemistry of Asymmetric Silicon. Stereospecific Platinum-Catalyzed Hydrosilation of 1-Octene with Optically Active R3Si*HLeo H. Sommer, Keith W. Michael, and Hiroshi. FujimotoCite this: J. Am. Chem. Soc. 1967, 89, 6, 1519–1521Publication Date (Print):March 1, 1967Publi…
Neutron diffraction data of NiCl2·6H2O have been taken at 1.5° and 4.2°K on the (h0l) zone. The magnetic reflections observed at both temperatures indicate that the magnetic structure consists of antiferromagnetic (001) planes, with an antiferromagnetic coupling between planes, to give a magnetic cell with cm = 2c. Us…
Summary Garnets undergo readjustment of ion-assemblages under external mechanical and thermal stresses; this adjustment favours those paths that annul the very cause to which it is due. Metal ions in garnets being replaceable, with rising metamorphism garnets become reluctant to accommodate ions of larger ionic radii.…
Fine‐grained glass‐ceramics containing a large proportion of β‐spodumene solid‐solution crystals were strengthened by immersion in molten sodium and potassium salt baths. An ion‐exchange reaction placed sodium or potassium ions in lithium ion sites in the β‐spodumene structure. The resultant “crowding” of the structur…
Direct x-ray measurements during deformation are compared with single slip and double slip calculations for rotations beyond the symmetry line. Both a literature survey of 152 face-centred cubic tests since 1923 and the present studv of 16 aluminium tests reveal that the use of the automatic double slip calculation fo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRelations connecting molecular properties and electron and x-ray diffraction intensitiesRussell A. BonhamCite this: J. Phys. Chem. 1967, 71, 4, 856–862Publication Date (Print):March 1, 1967Publication History Published online1 May 2002Published inissue 1 March 1967https://pu…
Abstract Synthetic Fe 3 S 4 is cubic, a 0 = 9.90 Å, space group Fd3m, Z = 8. The parameter u of sulfur positions in 32e site is estimated as 3/8, i. e. it has an ideal structure. Fe 3 S 4 was decomposed to tetragonal or hexagonal FeS and free S at below or above 190 °C under hydrothermal conditions. The transition bet…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of yttrium acetylacetonate trihydrateJames A. Cunningham, Donald E. Sands, and William Frederick WagnerCite this: Inorg. Chem. 1967, 6, 3, 499–503Publication Date (Print):March 1, 1967Publication History Published online1 May 2002Published ini…