Materials Literature
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Efforts directed towards perfecting the contemporary electron-microscopic devices require improvements in quality of focusing elements, creation of high-parameter lenses, together with tendency to greater simplicity in design. One of possible solutions of this problem is the employment of electrostatic crossed lenses…
This paper deals with the growth, conductivity, dielectric properties and visible absorption of Nb doped barium titanate single crystals grown from a KF flux. A chemical analysis was performed which exhibits the different kinds of compensation mechanisms. The transition temperature and the spontaneous polarization are…
薄片状や繊維状以外の結晶粉末で,通常の試料支持法では選択配向を起こしやすく,これにより回折線強度の再現性が悪くなる試料として,斜方晶系酸化鉛(II)を用い,数mg以下の場合でも可能な無配向測定試料の作製法を研究した.まず,粉末試料の分散ふりかけ装置を試作した.次いで,無反射試料板にはった粘着テープにガラスやイオン交換樹脂の微粒を一層だけ付着させたものや,アルミニウム製試料ホルダーにはった薄い布に粘着剤を付けたもの,その他の上に,この分散装置を用いて試料をふりかけ付着させ,回折線強度を測定した.その結果,粘着テープに(100～150)メッシュのガラス粒を付着させたものやストッキング用ナイロン製布を用いて,ほぼ無配向で回折線相対強度の…
1. Introduction. The Cambridge University 600 kV high resolution electron microscope has been developed as a joint programme between the Department of Engineering and the Department of Physics. The shorter electron wavelength at 600 kV when compared to 100 kV gives a potential improvement in resolution that can only b…
Anodic behaviour of iron and iron oxides was studied in neutral and acidic solutions in order to determine the passivity of iron. The oxides exhibited passivity-like behaviour at the potentials corresponding to that of the passive state of iron. Cathodic chronopotentiograms of passivated oxides showed that the oxides…
The fine structure tensor of the Cr3+ centre in TGS has been calculated using the EHT-SCCC MO method. The change of the fine structure tensor at the ferroelectric phase transition can be explained by model calculations supposing a shift of the oxygen atoms in the fifth and sixth co-ordinations about the principal z-ax…
Abstract A method is described for measuring the thermal conductivity of ice in the temperature range from 0.5 to 5.0 K using a 3 He apparatus. The results from our first experiments are not too far from the theoretical law for the low-temperature thermal conductivity of ice . Measurements at still lower temperatures…
"What is Corrosion?." British Corrosion Journal, 13(4), p. 153
The chlorochromates(II)[NMeH3]2[CrCl4], [NEtH3]2[CrCl4], [H2en][CrCl4], [H3dien][CrCl4]Cl, and [H4trien][CrCl4]Cl2(en, dien, and trien are ethylenediamine, 3-azapentane-1,5-diamine, and 3,6-diazaoctane-l,8-diamine respectively) are ferromagnetic whereas [NMe2H2]2[CrCl4] and [NMe2H2][CrCl3] are antiferromagnetic. The f…
A new and general method for measuring optical activity of crystals along other directions than optic axes has been developed. It is applied to the determination of a gyration tensor g 11 of non-enantiomorphous KH2PO4 and Gd2(MoO4)3. g 11 of both crystals manifest peaks at the Curie point. This new phenomenon seems to…
The pores, or voids, in concrete consist of pores in the hardened cement paste, entrained or entrapped air voids, and voids in the pieces of aggregate. The porosity of the aggregate is treated extensively elsewhere in this volume. Other void spaces such as honeycombing, which is the result of gross failure properly to…
Abstract The energy shifts of X-ray excited Auger electrons and photoelectrons for zinc and magnesium in their metals, oxides, halides, and chelate compounds are analyzed in terms of the relaxation effect. Zn 2p3⁄2, 3d photoelectron, Zn L3M45M451G Auger electron, Mg 1s, 2p photoelectron and Mg KL23L231D Auger electron…
Dielectic properties of single crystals of Ni-, Fe-, and Zn-fluorosilicates have been studied from 100 to 270 K. In spite of the symmetry of the ions, NiSiF 6 · 6H 2 O shows sharp dielectric losses with activation energy E a = 6.8 kcal/mole. The loss frequencies are compared with SiF 6 -2 reorientation motion and H 2…
Abstract A new type of specimen for determining stress corrosion threshold stress is described. The specimen has a tapered gage length that provides longitudinal stress distribution with a maximum to minimum stress ratio of 1.85. After a constant load stress corrosion test, the surface of the specimen is inspected and…
Acinetobacter sp. 351 isolated from soil grows well on butadiene oligomers and degrades 30 percent of a commercial sample of liquid polybutadiene (cis-1, 4 type, Mn=650) in 3 days. From the gel permeation chromatography of the substrate after the degradation, the strain was shown to degrade butadiene oligomers with th…
In this work the peculiarities of ferroelectric phase transition in proustite at T = 28. 7 K, which is of the first order and is accompanied by the change of symmetry from 3m to 1, are examined.
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The effect of molybdenum addition on the SCC susceptibility of sensitized stainless steel in oxygenated high temperature water has been studied through the creviced bent beam SCC test (CBB test) and A262E intergranular corrosion test. The molybdenum addition improved the SCC susceptibility of sensitized stainless stee…
The first observation of the low lying B 2(LO), B 2-polariton, E(LO), and E(TO) modes in the paraelectric phase of KDP have been attained by the z(xy)z, z(xy)z+Δy, x(yz)zx, and z(xz)x Raman scattering spectra, respectively. The spectra of both B 2-modes have been explained by a single damped harmonic oscillator model.…
The reaction of alkaline solutions of Na2[WO4](ca. 10–3 mol dm–3) with acid has been studied by stopped-flow-spectrophotometric and indicator-spectrophotometric techniques. The formation of ‘acid paratungstate’, [H8W6O24]4–, has been detected. It is the most important of the transient intermediates formed ca. 500 ms a…