Materials Literature
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When o-chlorobenzoic acid (OCBA) is recrystallized from toluene solution containing benzoic acid (BA) as impurity, BA co-crystallizes with OCBA because of formation of solid solution. The distribution coefficient of BA between crystal and toluene solution was estiamted by the differential crystallization method. The c…
Abstract Optical absorption has been used to study the impact damage in MgO and MgO:Li single crystals. The results are similar to that obtained in compressed crystals, except in MgO:Li with stable Li° defects, in which the impacts do not produce an increase of the 5.7 eV absorption band.
The tetrahedral units constituting the anionic network of silicate melts form a population containing five species the relative abundance of which depends on the degree of neutralization of the silica. These species may be enumerated by the probability calculation. In the absence of an electrostatic repulsion effect,…
Anomalies are observed in measurements of electromotive force and electric conductivity measurements of solid oxide electrolyte cells involving Cr(s)-Cr2O3(s) electrode. Transformation in Cr(s)-Cr2O3(s) system at about 1 653 K is suggested to explain the anomalies mentioned above on the basis of measured temperature d…
MO-P2O5系ガラス及び結晶 (M=Mg, Ca, Sr) の3N HNO3水溶液中への溶解熱と組成との関係をP-Ob架橋結合解離熱の立場から組成領域0<MO+H2O/P2O5(=r)<1, 1<r<2, 2<r<3において検討した. 溶解熱より計算されるM(PO3)2ガラスの生成熱を用いて, アルカリリン酸塩ガラスにおけると同様にE(P=O)/E(P-Ob)=1.75及び2.0と仮定して, P-O架橋結合, 非架橋結合エネルギー (E(P-Ob), E(P-Onb)) 並びにO-M-O結合エネルギーE(OM) を求めた.
The manufacture of plastic containers for carbonated beverages from polymeric resins by stretch blow molding technology has rapidly grown in recent years. Due to the unique properties of PET, such as high strength, transparency, surface gloss, low permeability, light weight, and recyclibility, billions of carbonated b…
The synthesis of the cations [Fe(η5-C5H5){PhP(CH2CH2PPh2)2}]+, [Fe(η5-C5H5){MeC(CH2PPh2)3}]+, and [Fe(η5-C5H5){C(CH2PPh2)4}]+ as hexafluorophosphate salts is described. These cations are reduced regioselectively by lithium aluminium hydride to give the corresponding iron hydride species by direct attack on iron. The m…
X-ray diffraction measurements of lattice distortions in organic solid solutions are discussed within the framework of model ideas of organic chemical crystallography. The distortions are shown to have a complicated concentration dependence. In each particular case this dependence is governed by similarity in geometri…
Abstract The influence of 4 reaction parameters on the homogeneous saponification method is examined. Firstly, the use of xylene, cyclohexane and tetrachloromethane instead of toluene indicates some experimental complications. It could however be concluded that a changing solubility parameter had a minor effect on the…
The morphology of dislocation etch pits on the (111) surface of Cu crystal etched with (NH4)2S2O8–NH4OH–NH4Br solutions has been studied by microscopic and interferometric observations. The composition, stirring and temperature of the etchant and the concentration of Al in Cu crystal are varied, and their effects on t…
The morphology of the 2H phase in a Ni67Cu8Sn25 alloy that was treated by different cooling rates was studied by means of electron microscopy. The transformation from the high temperature DO3-type cubic phase to the 2H(β-Cu3Ti)-type orthorhombic structure was found to be massive in the case of furnace cooling and mart…
Abstract The results of a preliminary investigation of the growth and morphology of p‐terphenyl crystals grown by sublimation and by solvent evaporation methods are reported. It was observed that lozenge–shaped (001) crystal plates are obtained from xylene and benzene solution while dendritic crystals by sublimation.…
メタリン酸塩ガラスの密度, 弾性率, 硬度, 熱膨張係数を測定した. 平均モル容と修飾陽イオンの半径の3乗 (アルカリ金属では, 陽イオシ半径の3乗の3倍) の間には2組の直線関係が成立した. それらは, それぞれノーマルタイプ (Ca, Sr, Ba, Li, Na) 及びアノーマラスタイプ (Mg, Zn) のガラスに対応する. これらの直線の比較よりアノーマラスタイプはノーマルタイプより空げきの多い構造であると推測される. 各種弾性率の対数と平均原子容の対数の間には3組の直線関係が成立した. それらは, それぞれLi, Naグループ, Ca, Sr, Baグループ及びアノーマラスタイプのグループに対応する. 硬度と陽イオンー…
In search of new organic nonlinear optic crystals, aromatic compounds with donor and acceptor substituents are extensively studied. Some new crystals with large nonlinear coefficient have been reported. This kind of crystals is usually not useful in ultraviolet region, because the distance between energy levels in con…
Abstract This paper is a review of our experimental research on the influence of the supersaturation, flow velocity and temperature on the linear crystallization rate of different faces of model crystal systems. The obtained experimental results are discussed in the light of the new theoretical treatments on crystal g…
Abstract Pyridoxal 5′-phosphate-α-amino acid–Zn(II) complexes and their salicylaldehyde analogues showed photochromic behavior in borate buffer at pH 9.5. A detailed comparison of UV spectral changes during the thermal back reaction with those for the complex formation indicates that the photoexcitation of the complex…
X-ray induced photoconductivity measurements reveal that the radiation-induced conductivity of polyethylene terepthalate films is greatly reduced by doping this polymer with 2,4,6-trinitrofluorenone which acts as a deep trap for the photocarriers. The radiation-induced conductivity of this doped dielectric is reduced…
The penetration behavior of Cs was studied in the oxide layer growing on SUS-316 stainless steel for a cladding material of fast breeder reactors under the condition of an oxygen potential controlled by a Ni/NiO oxygen buffer in the temperature range of 600–750°C, using radioactive 134Cs as a tracer. Two different kin…
SUMMARYMorphological, anatomical and ultrastructural differences have been observed in fronds of two months old cultures of Lemna minor L. These fronds are reduced in area and in thickness and never form colonies. They have been compared with normal and ABA treated fronds in order to determine if the above mentioned d…
Variation of salt or silica solubility as a function of water activity, capillarity pressure or pore size, is discussed as a probable origine of matter migration, concentration, and finally concretioning.