Kotoite, Mg<sub>3</sub>(BO<sub>3</sub>)<sub>2</sub>, from the Neichi Mine, Iwate Prefecture, Japan
Introduction. The first and second occurrences of kotoite, Mg3(B03)2, were reported by the first author from
Materials Literature
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The Prevention of the Activity Decrease of Metallic Oxide Catalyst in Synthetic Process of Vinyl Acetate
3ZnO・Cr2O3およびZnO・2Fe2O3の触媒に活性減衰防止の目的で,活性炭,シリカゲル,ZnCl2等を添加して,酢酸ビニル合成反応を実験し,その効果を検討した。その結果,もっとも減衰防止に効果的な物質はZnClであることを知った。また3ZnO・Cr2O3とZnO・2Fe2O3触媒に対する担体の効果が活性炭とシリカゲルとで相反することは興味深いことである。これらの実験結果から結局80ZnO・160Fe2O3・32SiO2・11MnO2-5ZnCl2・V2O5の組成の触媒を得た。この触媒は温度250℃,アセチレンと酢酸とのモル比を1とし,SV=1700/hr,触媒量50mlの反応条件で,連続100時間にわたる長時間反応の後にお…
Proton Magnetic Resonance Study of the Structure of Two Tutton's Salts
Proton magnetic resonance spectra of single crystals of two Tutton's salts, K2Zn(SO4)2·6H2O and K2Mg(SO4)2·6H2O, have been studied and the orientations of the water molecules in the structure have been determined. Using the heavy-atom structure of (NH4)2Mg(SO4)2·6H2O as determined by x-ray diffraction, a system of hyd…
Transport effects in cesium thermionic converters
One of the primary reasons for the failure of thermionic converters to attain their ultimate theoretical performance is electron transport effects occurring in the interelectrode spacing. Two major types of transport effects, electron scattering and electron space charge, are discussed and theoretical results compared…
Neutron Diffraction Study of κ Phase Cu-Mn-Al Alloys
Neutron diffraction study of the atomic and spin arrangement of the κ phase of ternary' alloys Cu 20 –Mn 30+ x –Al 50- x ( x =0 5 and 10) has beed performed. It is shown that, for alloys x ≠0, excess Mn atoms replace Al atoms at body center sites of CsCl type crystal lattice, and their spins couple antiparallel with t…
Effects of Ultraviolet Radiation on Fluorescent Lamp Phosphors
Irradiation of halophosphate lamp phosphors by a low‐pressure mercury arc causes a loss in luminescent efficiency, changes in the absorption spectra, and thermoluminescence. The 1849Aå wavelength is primarily responsible for these changes, which are partially reversed by longer wavelength radiation or by heat. X‐radia…
Self-diffusion of bismuth in bismuth oxide
G. D. Palkar, D. N. Sitharamarao and A. K. Dasgupta, Trans. Faraday Soc., 1963, 59, 2634 DOI: 10.1039/TF9635902634
Physicochemical Principles of Nickel Plating
Abstract not Available.
226. Copper(II) halides as halogenating agents
D. C. Nonhebel, J. Chem. Soc., 1963, 1216 DOI: 10.1039/JR9630001216
Die Cardenolide der Samen von Mallotus philippinensis (LAM.) MÜLL.‐ARG. (= Rottlera tinctoria ROXB.). Glykoside und Aglykone, 252. Mitteilung
Abstract The seeds of Mallotus philippinensis (Lam.) Muell.‐Arg. were found to contain 4 cardenolides (A, B, C and D) after fermentation. Two new glycosides, C and D, were obtained in crystalline form and were shwon to be corotoxigenin‐rhamnoside and coroglaucigenin‐rhamnoside respectively. The minor constituents A an…
Water sorption in dielectrics. Evaluation of some thermodynamic properties
The first page of this article is displayed as the abstract.
Oxygen-Controlled Conduction in Thin Films of Cuprous Iodide: A Mixed Valency Anion Semiconductor
Oxygen present in cuprous iodide greatly increases the electrical conductivity. Copper films were formed with differing oxygen contents by copper vapor condensation at various oxygen pressures. After iodination to the conductivity was found proportional to the 1/8.4 power of the oxygen pressure during condensation. Cu…
Color Center Formation by Pulse Irradiation of Alkali Halides
Abstract Preliminary observation is made of the absorption spectra of four alkali halides (LiF, NaCl, KCl, and KBr) at various intervals after bombardment, at room temperature, with a 2 microsecond pulse of 2 MeV electrons. The absorption is measured spectrographically using an underwater uranium spark light source wh…
Melting transitions in diene polymers
Abstract The melting transitions of natural rubber, cis ‐polyisoprene, gutta‐percha, balata and synthetic trans ‐polyisoprene, and cis ‐polybutadiene have been examined by means of differential thermal analysis. Natural rubber melts over a wide range of temperature giving several transitions, the magniture and tempera…
Portable Thermoelectric Generators
<div class="htmlview paragraph">The inherent advantages of quiet operation, few moving parts, and compact and lightweight construction make thermoelectric generators desirable for powering certain specialized military equipment. Recent developments in thermoelectric materials, couple designs, and couple compartm…
464. The chemistry of cedrelone
R. Hodges, S. G. McGeachin and R. A. Raphael, J. Chem. Soc., 1963, 2515 DOI: 10.1039/JR9630002515
The Systematic Determination of Crystallographic Orientations from Three Octahedral Traces on a Plane Surface
Abstract The problem of determining the orientation of a crystal from the directions of three nonparallel traces formed by the intersection of three octahedral planes with the surface of a suitably prepared specimen has been solved completely for the first time. A full analytical treatment is presented, and it is show…
The Preparation and Electrical Properties of Bismuth Trisulfide
The direct synthesis of bismuth trisulfide was investigated by differential thermal analysis. It is demonstrated that bismuth trisulfide forms exothermically at about 285°C and melts at 760° ± 5°C. The probable reasons for the previous detonations in the preparation of this compound are elucidated. The thermoelectric…
X-RAY STUDY OF TRIDYMITE (1)
Tridymite was synthesized under various conditions with respect to starting materials and mineralizers in room pressures. Some of them, in its X-ray powder diffraction data, show the features of tridymite M and tridymite S, which were confirmed by Hill and Roy in sythetic tridymite under the hydrothermal condition, an…
RELEASE AND FIXATION OF POTASSIUM IN DIFFERENT SIZE FRACTIONS OF SOME CANADIAN SOILS AS RELATED TO THEIR MINERALOGY
The average amount of non-exchangeable potassium removed by H-resin and boiling 1 N HNO 3 from the clay in eleven Canadian soils was about twice that in the fine silt, about four times that in the medium silt, and about eleven times that in the coarse silt and sand. Continuous leaching with 0.01 N HCl also removed fou…