Materials Literature
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Abstract A model is presented in which the appearance of displacive phase transitions is explained by short‐range internal forces. Electrically charged or uncharged parts of the structure are squeezed out of symmetrical positions and thus lead to a symmetry‐lowering and to phase transitions of ferroelectric or pure st…
Abstract Resonance and pre‐resonance Raman spectra are presented for the 1:1 and 3:1 solid complexes of perylene with tetracyanoquinodimethane (TCNQ). Selective resonance enhancement was observed for perylene. A study of the frequency dependence of the Raman intensities shows that, although these are weak complexes, c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFar-infrared spectra of ammonium, potassium, rubidium, and cesium metavanadatesShinji Onodera and Yusaku IkegamiCite this: Inorg. Chem. 1979, 18, 2, 466–468Publication Date (Print):February 1, 1979Publication History Published online1 May 2002Published inissue 1 February 197…
Abstract Data are presented on the second order Raman spectrum of rutile TiO 2 for various scattering geometries, at room and liquid N 2 temperatures. The results of a standard critical point analysis (i) allow the most important addition processes at low energies to be identified, (ii) indicate the importance of matr…
The rotational behavior of the ammonium groups in the high-temperature cubic phase of the perovskite NH4ZnF3 has been investigated, using incoherent quasielastic neutron scattering. The measurements were carried out for various wave vector transfers between 0.68 and 5.52 Å−1 and for temperatures between the transition…
In this paper a survey is given of some ultrastructural properties of synthetic hydroxyapatite. The preparation method by which single crystals with a length in the range of 0.1-3.0mm and a defined purity and stoïchiometry can be produced is given. Two groups of materials are considered in detail: carbonate-rich (grea…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReaction of a tetraaza[14]annulene cobalt(III) complex with acetylene. Synthesis and structural characterization of a novel cobalt(III) complex containing a pentadentate macrocyclic ligand with a carbon .sigma.-donor atomMarvin C. Weiss, Guy C. Gordon, and Virgil L. GoedkenC…
Abstract The uniplanar orientation of poly( p ‐phenylene terephthalamide) (PPTA) crystal was investigated by x‐ray and infrared measurements. Thin PPTA films 3–15 μm thick were prepared by coagulating a sulfuric acid solution of PPTA with various coagulants. Two types of uniplanar orientation were observed, depending…
The magnetic hardness of Sm(Co0.87Cu0.13)7.3 in bulk form is caused by pinning of the domain walls at precipitates which are of the Sm(Co,Cu)5 type. The hard magnetic properties of both the 2 : 17 matrix and the 1 : 5 precipitate phase have been investigated in the temperature range between 77 and 800 K. The domain-wa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNitrosylmetalloporphyrins. 5. Molecular stereochemistry of nitrosyl(5,10,15,20-tetratolylporphinato)manganese(II) and nitrosyl(4-methylpiperidine)(5,10,15,20-tetraphenylporphinato)manganese(II)W. Robert Scheidt, K. Hatano, G. A. Rupprecht, and P. L. PiciuloCite this: Inorg.…
Full-profile analysis of microdensitometer-measured Guinier–Hägg X-ray powder film data (strictly monochromatized Cu Kα1 radiation) [see Malmros & Thomas (1977). J. Appl. Cryst. 10, 7–11] is here extended to treat a multicomponent system where two of the components are refinable. The method is demonstrated for the cas…
The paper deals with a theoretical investigation of the shapes of the X-ray diffraction lines of crystals containing periodically distributed small-angle boundaries (SAB) of pure tilt character. The Fourier transforms of the diffraction lines are computed and subsequently subjected to a Warren–Averbach (WA) analysis.…
Two-dimensional X-ray diffraction patterns may be recorded quantitatively by means of X-ray-to-electron converters which are scanned in a television-type raster scan. Detectors of this type are capable of operating over the whole range of counting rates from very low to higher than those with which other types of conv…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrical and optical properties of the system TiO2-xFxS. N. Subbarao, Y. H. Yun, R. Kershaw, K. Dwight, and A. WoldCite this: Inorg. Chem. 1979, 18, 2, 488–492Publication Date (Print):February 1, 1979Publication History Published online1 May 2002Published inissue 1 Februar…
ADVERTISEMENT RETURN TO ISSUEArticleNEXTKinetic studies of the thermal decomposition of hydrazoic acid in shock wavesO. Kajimoto, T. Yamamoto, and T. FuenoCite this: J. Phys. Chem. 1979, 83, 4, 429–435Publication Date (Print):February 1, 1979Publication History Published online1 May 2002Published inissue 1 February 19…
A microstructural evaluation was made of experimental non-Ohmic ZnO ceramics by optical, scanning, and transmission electron microscopy complemented with electron beam microprobe and x-ray analyses. Four crystalline phases were identified: a major phase of ZnO grains containing Co and Mn in solid solution and three mi…
Current peaks due to transient SCLC were observed both in high-density polyethylene (HD-PE) and in oxidised HD-PE in the temperature range 50-90 degrees C. From the time at which the current peak occurs, carrier mobilities ranging from 10 -11 to 10 -9 cm 2 V -1 s -1 were obtained. The mobility values obtained agree we…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared spectroscopic study of the adsorption of isocyanic acidF. Solymosi and T. BansagiCite this: J. Phys. Chem. 1979, 83, 4, 552–553Publication Date (Print):February 1, 1979Publication History Published online1 May 2002Published inissue 1 February 1979https://pubs.acs.or…
Theodore Roosevelt writes that he has not had time to do much big game hunting while dealing with the cattle business and breaking in 52 new ponies. He also tells his sister to get some rest.
Single barriers in a ZnO varistor are measured separately. The step voltage at a grain boundary is 3.6 V at 1 μA. No great differences could be found between samples obtained from several suppliers. In a SEM the barriers could be detected by the voltage-contrast method. By using electron-beam-induced currents the spot…