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Metahalloysite is one of the kaolin group of minerals with a composition approximating to the formuia Al 2 O 3 .2SiO 2 .2H 2 O, and its structure is generally considered to be built of composite layers of atoms of the kind found in other minerals of this group. It differs from them most strikingly in that it can be pr…
A study has been made of electron bombardment conductivity in diamond using primary electrons of energies up to 14,000 ev. An alternating field method is used which reduces or eliminates the effects of internal space charge fields. Data on internal yields as a function of crystal field are given for both electron and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEquilibria in Hydrogenation of Esters and of IndolesHomer Adkins and Robert E. Burks Jr.Cite this: J. Am. Chem. Soc. 1948, 70, 12, 4174–4177Publication Date (Print):December 1, 1948Publication History Published online1 May 2002Published inissue 1 December 1948https://pubs.ac…
The experiments described below on the dehydration of halloysite were largely carried out in the laboratoire Central des Services Chimiques de l'État, Paris, where we enjoyed not only the excellent facilities of the laboratory but also the advice of Monsieur J. Méring and Mile R. Glaser who had made similar studies of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of AlkoxymethyltrimethylsilanesJohn L. SpeierCite this: J. Am. Chem. Soc. 1948, 70, 12, 4142–4143Publication Date (Print):December 1, 1948Publication History Published online1 May 2002Published inissue 1 December 1948https://pubs.acs.org/doi/10.1021/ja01192a049http…
The crystal structure of ZrOS has been investigated by means of X-ray powder photographs and by powder spectrometry. The substance has a simple cubic lattice with a0 = 5.696 ± 0.002 A. (λ = 1.5418 A.) with space group T4–P213. In the resulting structure Zr shows a co-ordination number of seven, being surrounded by thr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Chemistry of Spiropyrans.Ahmed. MustafaCite this: Chem. Rev. 1948, 43, 3, 509–523Publication Date (Print):December 1, 1948Publication History Published online1 May 2002Published inissue 1 December 1948https://pubs.acs.org/doi/10.1021/cr60136a004https://doi.org/10.1021/cr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolar-Type Rust InhibitorsH. R. Baker and W. A. ZismanCite this: Ind. Eng. Chem. 1948, 40, 12, 2338–2347Publication Date (Print):December 1, 1948Publication History Published online1 May 2002Published inissue 1 December 1948https://pubs.acs.org/doi/10.1021/ie50468a024https:/…
In order to explain the properties of a barium titanate single domain crystal, a previous theory of the ferroelectric effect in rochelle salt has been extended to the three-dimensional structure of barium titanate. This involves six equilibrium positions and results in significant differences from the single bond type…
The crystal structure of hexagonal barium titanate has been determined by X-ray methods. The unit cell, which contains six units of BaTiO3, has a0 = 5.735 A. and c0 = 14.05 A. In the space group C63/mmc all the ions occur at special positions: 2 Ba at (b), 4 Ba at (f), 2 Ti at (a), 4 Ti at (f), 6 O at (h), and 12 O at…
Abstract Polyvinyl alcohol prepared by hydrolyzing polymerized vinyl acetate is partially degraded within a few minutes by reagents known to attack 1,2‐glycol structures. The degree of degradation is limited, however, the final molecular weights of the degraded products being in the range of 3700 to 6500 (viscosity av…
In spherical photo-tubes with interchangeable emitters, energy distributions of external photoelectrons from the semiconductors, Te, Ge, and B, were compared with those of several metals. Contact potentials were determined from the saturation points of current-voltage characteristics. For the semiconductors, as contra…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDetermination of Tensile Strength of Natural Rubber and GR-STakeru. Higuchi, H. M. Leeper, and D. S. DavisCite this: Anal. Chem. 1948, 20, 11, 1029–1033Publication Date (Print):November 13, 1948Publication History Published online1 May 2002Published inissue 13 November 1948h…
A technique is described for the preparation of `single' crystals of BaTiO3. At room temperature the crystals are complexes of habit appropriate to cubic symmetry, but consisting of multiply-twinned tetragonal components with orientation very sensitive to externally applied pressure or electric fields. Optical and X-r…
Abstract An einem Rechenbeispiel wird gezeigt, wie sich Elektronenlinsen durch eine für Elektronen durchlässige ebene Metallfolie chromatisch korrigieren lassen. Die benachbarten Elektroden influenzieren auf der Folie negative Ladungen, die die langsameren Strahl-elektronen verhältnismäßig stark nach außen drängen und…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of the Thermal Decomposition of Isopropyl ChlorocarbonateArthur R. Choppin and Edgar L. CompereCite this: J. Am. Chem. Soc. 1948, 70, 11, 3797–3801Publication Date (Print):November 1, 1948Publication History Published online1 May 2002Published inissue 1 November 194…
(1948). 30—THE HEAT OF ABSORPTION OF WATER BY CELLULOSE. Journal of the Textile Institute Transactions: Vol. 39, No. 11, pp. T351-T367.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Vapor Pressures of Inorganic Substances. I. Beryllium1Robert B. Holden, Rudolph Speiser, and Herrick L. JohnstonCite this: J. Am. Chem. Soc. 1948, 70, 11, 3897–3899Publication Date (Print):November 1, 1948Publication History Published online1 May 2002Published inissue 1…
Tharty-second Guthrzc Lecture, delzvwed ow 4 %ne 1948N choosing a subject for the Guthrie Lecture it seems important to consider.the use to which such a lecture can be put.There is so much published now
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganosilicon Polymers. IV. Infrared Studies on Cyclic Disubstituted Siloxanes1C. W. Young, P. C. Servais, C. C. Currie, and M. J. HunterCite this: J. Am. Chem. Soc. 1948, 70, 11, 3758–3764Publication Date (Print):November 1, 1948Publication History Published online1 May 200…