spinel materials
41ferromagnetism — See ferromagnetic. * * * Physical phenomenon in which certain electrically uncharged materials strongly attract others. It is associated with iron, cobalt, nickel, and some alloys or compounds containing these elements. It is caused by the… …
42gemstone — /jem stohn /, n. a precious or semiprecious stone that can be cut and polished for use as a gem. [bef. 1000; ME gimstone, OE gimstan. See GEM, STONE] * * * Any of various minerals prized for beauty, durability, and rarity. A few noncrystalline… …
43Microspherulite — Microspherulites are microscopic spherical particles with < 2 mm diameters, usually in the 100 micrometre range, mainly consisting of mineral material (the Greek litos means stone ). Only bodies created by natural physico chemical… …
44Cobalt — This article is about the metal. For other uses, see Cobalt (disambiguation). iron ← cobalt → nickel ↑ Co ↓ Rh …
45Jewellery — (also spelled jewelry, see spelling differences) is a personal ornament, such as a necklace, ring or bracelet, made from gemstones, precious metals or other materials.The word jewellery is derived from the word jewel , which was anglicised from… …
46chemical element — Introduction also called element, any substance that cannot be decomposed into simpler substances by ordinary chemical processes. Elements are the fundamental materials of which all matter is composed. This article considers the… …
47Nanoarchitectures for lithium-ion batteries — Efforts in lithium ion batteries research have been to improve two distinct characteristics: capacity and rate. The capacity of the battery to store energy can be improved through the ability to insert/extract more lithium ions from the electrode …
48Spinelle — Pour les articles homonymes, voir Spinelle (homonymie). Spinelle Catégorie IV : oxydes et hydroxydes[1] …
49metamorphic rock — Any of a class of rocks that result from the alteration of preexisting rocks in response to changing geological conditions, including variations in temperature, pressure, and mechanical stress. The preexisting rocks may be igneous, sedimentary,… …
50Behavior of nuclear fuel during a reactor accident — This page is devoted to a discussion of how uranium dioxide nuclear fuel behaves during both normal nuclear reactor operation and under reactor accident conditions such as overheating. Work in this area is often very expensive to conduct, and so… …
