Yttrium iron garnet (YIG) is a kind of synthetic garnet, with chemical composition {Yttrium}3{Iron}2(Fe{Oxygen}4)3, or Y3Fe5O12. It is a ferrimagnetic material with a Curie temperature of 550 K. In YIG, the five iron(III) ions occupy two octahedral and three tetrahedral sites, with the yttrium(III) ions coordinated by eight oxygen ions in an irreg...
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http://en.wikipedia.org/wiki/Yttrium_iron_garnet
(from the article `yttrium`) ...and in electronic and optical devices including phosphors and lasers. Red phosphors containing yttrium and europium have greatly improved colour ... Yttrium-iron garnets are synthetic high-melting silicates that can be fabricated into special shapes for use as microwave filters in the ... [2 related ar...
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http://www.britannica.com/eb/a-z/y/13
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