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mischmetal
Mischmetal (from (ドイツ語:Mischmetall) - "mixed metal") is an alloy of rare earth elements. It is also called cerium mischmetal, rare earth mischmetal or misch metal. A typical composition includes approximately 50% cerium and 25% lanthanum, with small amounts of neodymium and praseodymium. Its most common use is in the ferrocerium "flint" ignition device of many lighters and torches, although an alloy of only rare-earth elements would be too soft to give good sparks. For this purpose, it is blended with iron oxide and magnesium oxide to form a harder material known as ferrocerium.
== History ==
Carl Auer von Welsbach was not only the discoverer of neodymium and praseodymium, and co-discoverer of lutetium, but was also the inventor of the light-mantle (using thorium), and of the rare earth industry. After extracting necessary thorium content from monazite sand, a lot of lanthanides were left over, for which there was no commercial use. He began exploration for applications to which the rare earths might be put. Among his first discoveries/inventions to bear practical fruit was Mischmetal.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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