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Yttrium aluminum garnet : ウィキペディア英語版
Yttrium aluminium garnet
:''YAG redirects here. For the IATA airport code see Fort Frances Municipal Airport. For the YMCA sponsored program see YMCA Youth and Government.''
Yttrium aluminium garnet (YAG, Y3Al5O12) is a synthetic crystalline material of the garnet group. It is also one of three phases of the yttrium-aluminium composite, the other two being yttrium aluminium monoclinic (YAM, Y4Al2O9) and yttrium aluminium perovskite (YAP, YAlO3). YAG is commonly used as a host material in various solid-state lasers. Rare earth elements such as neodymium and erbium can be doped into YAG as active laser ions, yielding Nd: YAG and Er:YAG lasers, respectively. Cerium-doped YAG (YAG:Ce) is used as a phosphor in cathode ray tubes and white light-emitting diodes, and as a scintillator.
==Gemstone YAG==
YAG for a period was used in jewelry as a diamond and other gemstone simulant. Colored variants and their doping elements include:〔 green (chromium), blue (cobalt), red (manganese), yellow (titanium), purple (neodymium), pink, and orange. As faceted gems they are valued (as synthetics) for their clarity, durability, high refractive index and dispersion. The critical angle of YAG is 33 degrees. YAG cuts similar to natural garnet, with polishing being performed with alumina or diamond (50,000 or 100,000) on common polishing laps. YAG has low heat sensitivity.
As a synthetic gemstone YAG has numerous varietal and trade names, as well as a number of misnomers. Synonymous names include: ''alexite'', ''amamite'', ''circolite'', ''dia-bud'', ''diamite'', ''diamogem'', ''diamonair'', ''diamone'', ''diamonique'', ''diamonite'', ''diamonte'', ''di'yag'', ''geminair'', ''gemonair'', ''kimberly'', ''Linde simulated diamond'', ''nier-gem'', ''regalair'', ''replique'', ''somerset'', ''triamond'', ''YAIG'', and ''yttrium garnet''. Production for the gem trade decreased after the introduction of synthetic cubic zirconia; there was little production.〔 Some demand exists as synthetic garnet, and for designs where the very high refractive index of cubic zirconia is not desirable.

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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