Iron(II) sulfide or ferrous sulfide (Br.E. sulphide) is a chemical compound with the formula FeS. In the oil/gas industry, iron sulfides are often present in a sour system due to reaction between corrosion products and hydrogen sulfide.
A material that conducts (see conduction) electricity poorly or not at all. If a voltage is applied to a dielectric, the atoms in the material arrange themselves in such a way as to oppose the flow of electric current. Glass, wood, and plastic are common dielectrics. (See insulator.)
SC: One thing we should recognize is that ALD, simply as a technology, is not actually the driver. The driver is the shift in the materials regime. When the semiconductor industry moves to high-K dielectrics for thin films, then chemical vapor deposition (CVD) runs out of steam, and the manufacturers need ALD.