The formation of amorphous inferlayers (a-interlayers) by solid-state diffusion in ultrahigh-vacuum-deposited polycrystalline Ti thin film on germanium and epitaxial Sir -xGe, (x=0.3, 0.4, and 0.7) alloys grown on (001)Si has been investigated by transmission electron microscopy and Auger electron spectroscopy. Amorphous interlayers, less than 2 nm in thickness, were observed to form in all as-deposited samples. The growth of the a-interlayers was found to vary nonmonotonically with the composition of Si-Ge alloys in annealed samples. On the other hand, the formation temperature of crystalline phase was found to decrease with the Ge content. The results are compared with those of the Ti/Si system. 0 1995 American Institute of Physics.
A number of Ni(I1) complexes of N, ,?i'-bis(8-quinolyI)trimethylenediami~s are synthesized both as perchlorate salts and neutraf amino complexes. Substitutions on the 2 and 6 positions of the quinolyl ligands are introduced for various reasons concerning the structural studies. The structural informations are obtained by studies of the magnetic properties, electronic spectra and NMR spectra..~ Structural changes effected by acid/base NMR spectroscopy.
Various N′,N‐bis(8‐quinolyl) trimethylenediamines 3a‐3e have been prepared from the corresponding 8‐aminoquinolines 1a‐1e by direct N‐alkylation with 1, 3‐dibromopropane in fair yield (25‐51%). N. N′‐bis(8‐quinolyl) ethylenediamines, 3f and 3g, and N,N′‐bis(8‐(6‐methoxyquinolyl) ]tetramethylenediamine. 3h, may only be synthesized in poor yield via the corresponding oxalamides and succinamide.
Densely sintered Mn–Zn ferrites with grain size varying between 1 and 6 μm were obtained. Then the effect of grain size was investigated in detail by power loss analysis and scanning electron microscopy examination of microstructure. It is found that the power loss is seen to be lowered from 260 to 120 kW/m3 at 500 kHz, 50 m T and 90 °C with grain size decreased in the order of 3 μm. It is assumed that the residual loss from domain wall resonance is a dominant factor of power loss from 500 kHz to 1 MHz. Therefore we conclude that Mn–Zn ferrite display a grain size dependent power loss with transition at grain size about 3 μm due to the absence of intragranular domain wall and these fine core materials can be prepared by low sintering temperature and the optimum control of atmosphere containing 0.5% O2.
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