A transparent yttrium aluminum garnet precursor composition is provided that includes a plurality of calcined particles of yttrium aluminum oxide having a mean particle domain size of between 10 and 200 nanometers and a predominant hexagonal crystal structure. High levels of YAG transparency are obtained for large YAG articles through control of the aluminum:yttrium atomic ratio to 1:06±0.001 and limiting impurity loadings to less than 100 ppm. The composition is calcined at a temperature between 700° Celsius and 900° Celsius to remove organic additives to yield a predominant metastable hexagonal phase yttrium aluminum oxide nanoparticulate having an atomic ratio of aluminum: yttrium of 1:0.6±0.001. With dispersion in an organic binder and a translucent YAG article is formed having a transmittance at a wavelength of 1064 nanometers of greater than 75%. The translucent YAG article is characterized by an average domain size of less than 1 micron and having a density of at least 99% and inclusions present at less than 2 surface area percent. The ability of a batch of yttrium aluminum oxide nanoparticles to serve as a transparent YAG precursor includes collecting an X-ray fluorescence spectrum from a plurality of aluminum oxide nanoparticles having a predominant crystal structure other than garnet to yield an A1:Y raw integrated peak intensity ratio. The nanoparticles are sintered to yield a predominant garnet phase and a secondary phase and optionally isostatic pressing during sintering. By using only precursor nanoparticles with a standard deviation of ±0.003 in the peak ratio exceptionally high transparency YAG is reproducibly produced.
提供了一种透明的
钇铝石榴石前体组合物,其中包括具有平均粒径在10到200纳米之间且具有主要六角晶体结构的
钇铝氧化物的多个煅烧颗粒。通过将铝:
钇原子比控制在1:06±0.001之间并将杂质含量限制在不到100 ppm来获得大型YAG制品的高透明度。将该组合物在700℃至900℃的温度下煅烧以去除有机添加剂,得到具有主要亚稳态六角相
钇铝氧化物纳米颗粒,其铝:
钇原子比为1:0.6±0.001。通过在有机粘合剂中分散,形成具有1064纳米波长透过率大于75%的半透明YAG制品。该半透明YAG制品的特征是平均颗粒大小小于1微米,密度至少为99%,且包含物在2%以下的表面积。一批
钇铝氧化物纳米颗粒作为透明YAG前体的能力包括从具有主要非石榴石晶体结构的氧化铝纳米颗粒的多个X射线荧光光谱中收集A1:Y原始积分峰强度比。通过使用仅具有峰值比标准偏差为±0.003的前体纳米颗粒,可再现地产生极高透明度的YAG。