Mischmetal
Alloy of rare-earth elements used in lighter flints and metal refining.
Mischmetal (from German: Mischmetall – 'mixed metal') is an alloy of rare-earth elements, also called cerium mischmetal or rare-earth mischmetal. Its most common use is in the pyrophoric ferrocerium 'flint' ignition device of many lighters and torches.
- composition
- Approximately 55% cerium, 25% lanthanum, 15–18% neodymium, traces of other rare earth metals totaling 95% lanthanides, plus 5% iron
- discoverer
- Carl Auer von Welsbach
- first prepared from
- Monazite
- common abbreviation
- Mm (e.g., MmNi5)
- typical price (2007)
- Less than 10 USD per kilogram
Lore & Background
Carl Auer von Welsbach, discoverer of neodymium and praseodymium and co-discoverer of lutetium, invented the gas mantle and founded the rare-earth industry. After extracting thorium from monazite sand, many lanthanides remained with no commercial use, leading him to seek applications and invent mischmetal. Historically, mischmetal was prepared from monazite by cracking the ore with sulfuric acid or sodium hydroxide, removing thorium and radium, converting the lanthanides to chlorides, dehydrating them, and electrolyzing the molten anhydrous chloride. The traditional rare-earth chloride was also used by companies to extract individual rare earths without processing ores directly.
Reader's Guide
Mischmetal is significant as the foundational alloy of the rare-earth industry, invented by Carl Auer von Welsbach to find use for lanthanides left after thorium extraction. Its primary legacy is in pyrophoric ignition devices—ferrocerium 'flints' for lighters and torches—achieved by blending with iron oxide and magnesium oxide to harden the alloy. Beyond this, mischmetal is used in preparing virtually all rare-earth elements, as their chemical similarity makes ordinary extraction processes ineffective; specialized separation processes, exploiting subtle solubility differences, were developed by von Welsbach and later informed Marie Curie's search for new elements. The alloy also finds a niche application in zinc-aluminium galvanising (Galfan process) for steel wire, where traces of cerium and lanthanum mischmetal are added. Mischmetal thus represents both a historical solution to a waste problem and a continuing industrial commodity.
Did You Know?
- Mischmetal is commonly abbreviated as Mm in chemical formulae, e.g., MmNi5.
- Because an alloy of only rare-earth elements would be too soft for good sparks, mischmetal is blended with iron oxide and magnesium oxide to form ferrocerium.
- Monazite-derived mischmetal typically contained about 48% cerium, 25% lanthanum, 17% neodymium, and 5% praseodymium.
Frequently Asked Questions
What is Mischmetal?
Mischmetal is a mixed alloy of rare-earth elements, sometimes called cerium mischmetal or rare-earth mischmetal. The name comes from the German word 'Mischmetall,' which simply means mixed metal.
What is Mischmetal made of?
The alloy contains roughly 55% cerium, 25% lanthanum, 15–18% neodymium, and traces of other lanthanides that bring the rare-earth total to about 95%, with the remaining 5% being iron. It was originally prepared from the mineral monazite.
Who discovered Mischmetal?
Austrian chemist Carl Auer von Welsbach is credited with first preparing the alloy. His work on this mixed rare-earth metal paved the way for its later practical applications in ignition devices.
What is Mischmetal most commonly used for?
Its biggest everyday role is in the pyrophoric 'flint' rods of many lighters and torches, where scraping the alloy produces sparks for ignition. It also serves in metal refining processes.
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