Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
A variety of steel powders for bearing applications, such as high-speed tool steel, M50 and 440C steels, etc., prepared through vacuum induction melting (VIM) and inert gas atomizer were canned and consolidated by hot extrusion to bars for specimens used in this experiment. The carbide sizes of the extruded materials…
The electron density in synthetic calcite, CaCO3, has been determined using diffraction data for a naturally faced single crystal measured with X-ray Mo Ka (A = 0.71073/~) radiation. Extinction corrections that minimize differences between equivalent reflection intensities are closely approximated by the values which…
Fluorapopbyllite, KCa 4 Si 8 O 20 F.nH 2 O, n(H 2 O) = 8, was dehydrated at 473 K to an average of n(H 2 O) = 4. Rietveld analysis of neutron powder diffraction data from the partially dehydrated sample showed no evidence of a crystalline hemi-dehydrated form of fluorapophyllite. The dehydration process is described a…
希土類元素(La,Ce,Pr,Nd)のプロピオン酸塩一水和物の熱分解過程を熱重量測定(TG),示差熱分析(DTA)および示差走査熱量計(DSC)などによって研究した。出発物質および熱分解によって生成した化合物の組成を赤外吸収スペクトロスコピー(IR)と粉末X線回折計で同定し,さらに元素分析,化学分析およびICP発光分光分析により定量的に求めた。無水和物から酸化物への熱分解過程中に発生する気体をガスクロマトグラフィーで分析した。一水和物の脱水反応は一段階で連続的に進行し, 脱水過程中には中間水和物の生成は認められなかった。無水和物は融解現象を示し,その融解熱はつぎのような値が得られた。La:18.82kJ・mol-1,Ce:9.23…
2種のヒドロキシアパタイト(HAP)試料(A),(B)を種々の濃度の塩化ナトリウム(NaCl),酢酸ナトリウム(NaAc),あるいは硫酸ナトリウム(Na2SO4)水溶液に懸濁させ(添加濃度2g/dl),溶解平衡に達したのち溶出したリン酸イオン濃度[Pi]とカルシウムイオン濃度[Ca2+]および母液のpHを調べた。[Pi]増大におよぼす添加電解質の作用の強さの序列はNa2SO4>NaAc>NaClとなり,[Ca2+]増大におよぼす添加電解質の序列は逆にNaCl>NaAc>Na2SO4となった。また懸濁液のpH増大におよぼす電解質の序列は[Pi]の場合と同じであった。これらは2種の試料に共通してみられたのでHAPの特性であると結論した…
Styrene and its derivatives form coloured charge transfer complexes with tetranitromethane as the acceptor. These complexes are stable in acetonitrile under neutral conditions in the dark for several days. Photochemistry of these complexes was found to be highly dependent on the structure and substituent effects on th…
Abstract The temperature dependence of the thermal expansion, the dielectric constant, the pyroelectric current and the remanent polarization in polycrystalline samples of Ba(Ti 1‐ x Sn x )O 3 was measured. The influence of the external electric field and Sn‐substitution on the character of all phase transitions was i…
Polysiloxane films were prepared by plasma polymerization and dip coating. Upon these films PEG was grafted by conventional methods, and ethylene oxide by plasma activation. Before and after grafting the films were analyzed by contact angle and ESCA measurements as well as by FTIR-ATR-spectroscopy and TOF-SIMS. Furthe…
Recently, Chen et al. have suggested that the Eu3+ ion luminescence from f-f transitions could be used as an alternative to x-ray diffraction in the determination of crystal structure. From the results of the room-temperature luminescence data for three different host crystals only, the authors claim that this method…
Seventeen esters, derived from 4-n-alkoxy-3-fluorophenols and 4-(5-n-alkyl-2-thienyl)benzoic acids, have been prepared and their liquid crystal transition temperatures determined by thermal optical microscopy. On cooling the isotropic liquid, the SA-SC-SA sequence of phases reported for the octyloxy-octyl and octyloxy…
The characterization of the surface properties of ZrC films grown by thermally evaporating ZrC onto room temperature W(100)and W(110) and then annealing, are reported. These films as deposited have no long range order as determined by low energy electron diffraction, but heating to above 1800 K produces well-ordered l…
Spatial dispersion effects in chiral liquid crystals are reviewed. New spatial dispersion phenomena are observed in the vicinity of the Bragg reflection wavelength–an anomaly of the refractive index and an optical anisotropy of the cubic blue phases. These effects can be explained by taking into account the spatial di…
57Fe transmission Mössbauer spectroscopy and X-ray diffraction measurements are performed on icosahedral quasicrystals. Magnetic and electronic properties including lattice vibrational states are studied and compared for Al–Cu–Fe– and Fe-doped Al–Cu–Ge–Mn–type quasicrystalline alloys. In the latter, magnetic long-rang…
Abstract This article describes the physical principles of brazing with illustrations and details elements of the brazing process. The elements of brazing process include filler-metal flow, base-metal characteristics, filler-metal characteristics, surface preparation, joint design and clearance, temperature and time,…
無水コハク酸と各種オキシランとの開環共重合を3種類の触媒にて行い, 得られた共重合体の特性, 特に生分解性について調べた. 無水コハク酸とオキシランとの交互共重合体であるポリエステルの分子量 (Mn) は10000から20000であった. オキシランを過剰に用いた場合には, 分子量は1OOO0から50000のコポリエステルエーテルが得られた. アルミニウムトリイソプロポキシドの場合には, モノマー仕込比に関係なく交互共重合体が得られた. またジエチル亜鉛では, ランダムコポリマーが得られた. リパーゼによる加水分解より, プロピレンオキシドとの共重合体の分解性が最も優れ続いてエチレンオキシド, アリルグリシジルエーテルとの共重合体…
Application of X-ray photoelectron spectroscopy (XPS) to corrosion science was introduced in both qualitative and semiquantitative aspects. In particular, abilities and limitations as a surface analytical technique were explained with practical examples.
Abstract In the presence of excess hydrogen peroxide and formic acid the latex stage epoxidation of natural rubber is pseudo–first order in nature. A kinetic model is developed to predict the maximum extent of epoxidation for the reaction system and its variation with increasing acid concentration. Th dependence of th…
Raman spectra of carbon overcoats of simulated hard magnetic storage discs were obtained for different conditions of deposition by argon ion-induced sputtering. Both an increase of substrate temperature and of argon ion pressure improved the spectral resolution of the two major Raman peaks, one at 1360 cm-1 (the so-ca…
Diffusion coefficients and solubilities of hydrogen in grain-refined aluminum have been measured by a vacuum hot extraction method. Four samples with different grain sizes are prepared by melting, addition of Ti and B, casting, remelting and unidirectional solidification. Grain-refined samples contain some small parti…
Single crystals of β-CuZn have been deformed in direct shear in a wide range of temperatures in different shear systems. The shear systems studied were ⟨111⟩-{112}, ⟨111⟩-{110},⟨100⟩-{100}, ⟨100⟩-{110}, ⟨110⟩-{100} and ⟨110⟩-{110} systems. In the case of the ⟨111⟩-{112} shear system the crystals were deformed in both…