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Float glass contains a small amount of nickel sulfide, formed from the sulfur in the fining agent Na 2 SO 4 and the nickel contained in metallic alloy contaminants. [9] Nickel sulfide inclusions are a problem for tempered glass applications. After the tempering process, nickel sulfide inclusions are in the metastable alpha phase.
This is an accepted version of this page This is the latest accepted revision, reviewed on 1 February 2025. This article is about the chemical element. For other uses, see Sulfur (disambiguation). Chemical element with atomic number 16 (S) Sulfur, 16 S Sulfur Alternative name Sulphur (pre-1992 British spelling) Allotropes see Allotropes of sulfur Appearance Lemon yellow sintered microcrystals ...
The concept of plotting the free energies of reaction of various elements with a given gas-phase reactant may be extended beyond oxidation reactions. The original paper by Ellingham explicitly to the reduction of both oxygen and sulfur by metallurgical processes, [ 1 ] and anticipated the use of such diagrams for other compounds, including ...
16 S sulfur; use (amorphous) 2×10 15 Ωm ... (room temperature) (alpha, polycrystalline) calculated from single crystal values 56.2 ... 28 Ni nickel; use 5.45 nΩm ...
The only elements strongly attracted to magnets are iron, cobalt, and nickel at room temperature, gadolinium just below, and terbium, dysprosium, holmium, erbium, and thulium at ultra-cold temperatures (below −54 °C, −185 °C, −254 °C, −254 °C, and −241 °C respectively). [142] Iridium
Nickel is a silvery-white metal with a slight golden tinge that takes a high polish. It is one of only four elements that are ferromagnetic at or near room temperature; the others are iron, cobalt and gadolinium. Its Curie temperature is 355 °C (671 °F), meaning that bulk nickel is non-magnetic above this temperature.
A historic phase diagram of sulfur. A phase diagram from 1975, presenting data through 1970. The ordinate is pressure in kilobars (kbar). and the abscissa is temperature in kelvins (K). (The temperatures 200, 400, 600, and 800 K correspond to the approximate temperatures of −73, 127, 327, and 527 °C, respectively.)
Phase diagram of the Ni–Al system, showing relevant phases SEM of Raney nickel catalyst in which crystals of 1-50 μm are seen. A close-up of Raney nickel. Small cracks of approximately 1-100 nm width are seen within the crystals, causing the increased surface area. Macroscopically, Raney nickel is a finely divided, grey powder.