Yttrium aluminum garnet as a scavenger for Ca and Si

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Sabanci University, FENS, Orhanli-Tuzla, Istanbul 34956, Turkey [1 ]
不详 [2 ]
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Journal of the American Ceramic Society | 2008年 / 91卷 / 11期
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Doped yttrium aluminum garnet; Y3Al5O12; (YAG); has drawn considerable attention for solid-state industrial; medical; and scientific laser applications. The crystal optical activity is closely related to the type and amount of doping element. Studies on highly yttrium-doped; creep-resistant alumina ceramics with Ca and Si contamination have indicated that YAG precipitates in the ceramic had a propensity to allow the simultaneous incorporation of Ca and Si impurities on the order of 1% into their structure. The cosolubility potential for Ca and Si in YAG crystals was investigated through systematic doping and codoping of YAG polycrystals with Ca2+ and/or Si4+. It was shown via X-ray diffraction and electron probe microanalysis techniques that the ceramic can accommodate more than an order of magnitude amounts of Ca2+ and Si4+ when they are incorporated in equal amounts simultaneously than when they are introduced alone. The cosolubility limit for Ca and Si was determined to be between 3% and 4% of the cation amount in pure YAG. Enhanced co-solubility was discussed in terms of size and charge compensations in the lattice. Codoping with a suitable element is introduced as a possible way to increase the solubility of useful cations in this ceramic; which is the host material for lasers. © 2008 The American Ceramic Society;
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页码：3663 / 3667
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