ABSTRACT
Amorphous material of the class FeSiB-(Cu,Nb) has been investigated with a background of soft-magnetic application of the corresponding nanocrystalline material. Thin-film analytical methods (SIMS, AES, TEM) have been used to study the diffusion of Si in such materials prepared as layer systems by magnetron sputter deposition. Significant interdiffusion occurs even at low temperatures - approximately 400 degrees C. Quantitative description failed, however, because formation of new iron monosilicide phases begins above this temperature. It is concluded that only high-mass-resolution SIMS or radioactive tracer analysis can be used for successful acquisition of information at this material system.
ABSTRACT
Angioblastic-appearing nodules of small arteries of heart, pancreas, and kidneys were found during microscopic study of autopsy specimens form subjects with hypertension that had responded poorly to treatment. These vascular lesions were noted in three of 15 subjects studied; they were associated with a proliferative arteriolosclerosis that was most severe in the kidney and the pancreas, but was occasionally found in the arterioles of the heart. Two of these three subjects had received treatment with dialysis; one had not. The nodules originated concentrically along a segment of small artery and consisted of a mass of mesenchymal cells and capillary-sized blood channels. There were fragmentation and focal loss of the internal elastic lamina at their points of origin, and vessel-wall necrosis in an occasional lesion. Many of these nodules appeared identical to plexiform lesions of the lung and to cellular types of Charcot-Bouchard aneurysms of the CNS.
