The method of casing objects using a protective cover glass bound to the object using a tape or frame promotes glass corrosion on the inside surface of the cover glass in preference to the outside surface. The characterization of some of the corrosion products found on these glasses is discussed especially as it applied to cased! daguerreotypes. The geometry of these packages is responsible for the corrosion phenomenom. The types of corrosion products and the severity of the corrosion is a function of the bulk composition of individual cover glasses.

No abstract

Articles you may be interested inStudy of the annealing kinetic effect and implantation energy on phosphorus-implanted silicon wafers using spectroscopic ellipsometry Spectroscopic ellipsometry and transmission electron microscopy study of annealed highdose oxygen implanted silicon Si( 1(0) wafers were implanted with 0+ at an energy of 180 keY to a dose of2.3X lO H1 /cm 2 in the separation by implanted oxygen process. Following implantation, one wafer was annealed at 1275 °C for 2 h. Spectroscopic ellipsometry measurements were then performed on these samples. Effective medium modeling of the measurements was used to nondestructively depth profile the samples. These results show that the superficial Si layer for the unannealed sample includes noncrystalline and crystalline components. In addition, the optical properties of the buried oxide for the unannealed sample were found to be different from those of bulk fused si.lica or thermal oxides of Si. The superficial Si layer for the annealed sample was crystalline 8i, but the buried oxide consisted of a phase~separated mixture of noncrystalline Si0 2 and crystalline Si. These results were further substantiated by selective chemical etch-back studies and additional spectroscopic ellipsometry measurements, and by other techniques, including Raman spectroscopy, infrared transmission measurements, sputter depth profiling using x-ray photoelectron spectroscopy, and Nomarski microscopy. 7211

No abstract

No abstract