Materials Literature
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We demonstrate, for the first time to our knowledge, frequency doubling of 1064 nm radiation in sulphide crystals of Ag/sub x/Ga/sub x/Ge/sub 1-x/S/sub 2/ having engineerable birefringence and superior nonlinearity in comparison to oxide crystals.
Early transition-metal oxyhalides, (MCl)LaNb2O7 (M = V, Cr) have been prepared by ion exchange of layered perovskite hosts, ALaNb2O7 (A = Li, Rb), with anhydrous metal halides, MCl2. These compounds contain low-valent metals (M2+) that are receptive to oxidation. Thermogravimetric analysis (TGA) shows oxygen uptake at…
The LaMn 1− x Ga x O 3 series has been studied by means of x-ray absorption spectroscopy (XAS) at the Mn and Ga K-edges. The local electronic and geometric structure around Ga 3+ barely changes along the series showing that Ga 3+ only acts as a constructive element of the crystal structure. On the contrary, the intens…
Conventionally, leather manufacture involves muti-step processing viz., beam house operations, tanning, post tanning and finishing. Even though this muti-step processing followed for centuries is logical, it will be highly beneficial if there is a possibility of integrating any of these steps. Hence in the current wor…
Rapidly solidified(RS)AZ31 magnesium alloy ribbons were made using melt spinning technique.The results show that its microhardness increases with the wheel speed,and after heat treatment,the microhardness of the ribbons produced at 1600 r/min also increases.Rapid solidification leads to reduction of grain size.When th…
In the present study, the heterogeneous conversion of nitrogen oxide (NO) and nitrogen dioxide (NO<sub>2</sub>) was studied at atmospheric humidity levels on flame soot surfaces treated with gaseous nitric acid (HNO<sub>3</sub>). In addition, the heterogeneous reaction of HNO<sub>3</sub> on soot was investigated at at…
The effect of β-quenching performed in the final size of Zircaloy-4 guide tubes and Zircaloy-2 sheets during fabrication process on the products' mechanical properties, crystallographic texture, microstructure, and corrosion behavior has been investigated and presented in this paper. Moreover, the impact of this proce…
Typically, low strength steels and annealed stainless steels are specified for geothermal energy applications because of the risk of Sulfide induced Stress Corrosion Cracking (SSCC) and Hydrogen Induced Cracking (HIC) in the presence of H2S containing fluids. Recent experience has demonstrated the risk of SSCC and HIC…
The BMW Group is engaged in the development of a SOFC system for mobile applications (auxiliary power unit – APU). Since this application demands low weight and high durability, metal supported-cells are preferred instead of sophisticated SOFCs using a thick anode support. Therefore tape-cast and pre-fired ferritic st…
Scandia stabilised zirconias offer much better performance than the conventional yttria stabilised materials and now it seems that availability and cost may not be hugely problematic. This offers a very important way forward to fuel cell manufacturing. It is shown here that a small addition of 2 mol% yttria to scandia…
The corrosion morphologies of as-extruded magnesium alloy AM60 in 3.5%NaCl aqueous solutions with pH 3 , 7 and 12 were observed, and the number and size of corrosion pits were measured. The effect of pH values on corrosion of AM60 and the role of AlMn particles in corrosion were discussed. A corrosion model of AM60 wa…
A novel blend composition was prepared based on chlorinated butyl rubber (CIIR) and poly(meth)acrylate (PMAc).The results obtained from DMA,DSC measurements show that it is possible to shift the effective damping functional region of CIIR toward higher temperature region whether the blend composition was prepared with…
The polymer of chlorinated-phenyl methyl-terminated silicon oil (code as CPSO) was synthesized. The physical properties such as saturated vapour pressure and evaporation weight loss of CPSO were investigated. The thermal stability of CPSO was analyzed using thermogravimetric analysis in nitrogen atmosphere. The tribol…
Rapidly solidified (RS) AZ31 magnesium alloy ribbons were made using melt spinning technique. The results show that its microhardness increases with the wheel speed, and after heat treatment, the microhardness of the ribbons produced at 1 600 r/min also increases. Rapid solidification leads to reduction of grain size.…
Glass - like carbon, an important material with unique properties, has been widely used in many fields. Tremendous progress has been made in the research about the properties, methods of preparation, applications as well as fundamental structure of glass - like carbons in the past decades. The results available now in…
ポリアセタール (POM) の導電性を付与するため導電材料 (カーボンブラック (CB)) とともに添加した熱可塑性ポリウレタンエラストマー (TPU) の相構造の効果について考察した. 電子顕微鏡 (SEM) 観察から, POMの海相にCBを包含したTPU相が分散していることが確認された. これはPOM, TPU, CB各成分の表面張力から算出した界面張力を使ったHarkinsの式から分散状態を推定した3成分相構造とよく一致した. POM, TPU, CBの3成分系では, CBによるポリアセタールの熱分解も抑制されることが判明した. また, ポリアセタールを分解除去してもTPU相は形態を保ち, 導電性も維持していることから, T…
Transparent and conductive oxides CdIn2O4 (CIO) thin films were prepared by RF reactive sputtering from a CdIn alloy target in Ar+O2 atmosphere. By the analysis and measurements of transmittance spectra and Hall_effect of different samples prepared at different substrate temperatures and post_deposition annealing in…
On a capillary discharge setup lasing in Ne-like Ar at 46.9nm, the ablation of c apillary wall was investigated for polythene and alumina material at both of inh erent 2—5kA-pre-pulse of setup and separate pre-pulse of 20A by measuring soft x ray emission from the capillary discharged. For inherent pre-pulse and polyt…
The paper presents the results of a study of the formation and decay of lattice defects in nonlinear optical crystals of NH4H2PO4 (ADP), KH2PO4 (KDP), Li2B4O7 (LTB) and LiB3O5 (LBO) with a sublattice of mobile hydrogen (ADP, KDP) and lithium (LTB, LBO) cations. By means of the luminescent and absorption optical spectr…
Four kinds of biodegradable polymers were immersed in water around 301 K and 351 K for fixed periods from 1 to 720 hours, and their degradation was studied by observing their shapes, weights, molecular weights, and space charge distributions. Samples tested were poly-L-lactic acid (PLLA), polycaprolactone butylene suc…