Abstract We present the effect of silica on the preparation of dense Lu2SiO5:Ce (LSO:Ce) compacts. Powders of LSO:Ce were first obtained by combustion synthesis and characterized by thermal analysis, indicating the presence of free amorphous silica in amounts approaching 5 wt%. Calcination treatments at a variety of temperatures resulted in the partial volatilization of the silica and the formation of B-type LSO. However, higher temperatures enhanced agglomeration and particle growth, which can be problematic during the sintering process as it impedes full densification. During subsequent sintering of the powders, evaporation of residual silica may impede full densification and assist the formation of pores, thus an understanding of the presence of silica is important for sintering these materials. Powders calcined at a temperature of 1773 K and densified by spark plasma sintering showed the highest photoluminescence emission intensity. At this temperature there is a trade-off between decreasing electron trap density and oxidation of cerium ions.

中文翻译：

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SiO2对掺铈氧正硅酸镥烧结的影响

摘要 我们介绍了二氧化硅对制备致密 Lu2SiO5:Ce (LSO:Ce) 压块的影响。LSO:Ce 粉末首先通过燃烧合成获得，并通过热分析表征，表明存在接近 5wt% 的游离无定形二氧化硅。在各种温度下的煅烧处理导致二氧化硅的部分挥发和 B 型 LSO 的形成。然而，较高的温度会增强团聚和颗粒生长，这在烧结过程中可能会出现问题，因为它会阻碍完全致密化。在粉末的后续烧结过程中，残留二氧化硅的蒸发可能会阻碍完全致密化并有助于孔的形成，因此了解二氧化硅的存在对于烧结这些材料很重要。在 1773 K 的温度下煅烧并通过放电等离子体烧结致密的粉末显示出最高的光致发光发射强度。在此温度下，在降低电子陷阱密度和铈离子氧化之间存在权衡。