Abstract Pure yttrium-aluminum-garnet (YAG) nano particles were synthesized via normal and reverse co-precipitation methods using nitrate starting solutions and ammonium hydrogen carbonate (AHC) as precipitator agent. The impact of titration method on the phase evolution, thermal behavior, precipitate's composition, morphology and chemical bonds of powders were studied by XRD, TG-DTA, FTIR, FESEM, TEM, EDS and BET analysis. The results revealed that in the normal method, the precipitates were composed of relatively dense particles compared with more homogenous fluffy precipitates with higher carbonate content obtained by the reverse method. The precursors achieved by the reverse method formed less agglomerated and smaller size YAG powders after calcination at 900 °C. Calcined nano powders were processed by spark plasma sintering (SPS) technique at 1350 °C for 10 min without any sintering aids or dispersive agents. The sintering of both powders led to a highly dense and fine submicron-structured YAG ceramic. However, the YAG ceramic produced by SPS of reverse co-precipitated nano powders showed higher transparency (43% at 680 nm and 58% in near-infrared range) and finer micro-structure (about 210 nm in grain size) as compared with normal co-precipitated nano particles.

中文翻译：

---

不同共沉淀法合成与放电等离子烧结YAG纳米粉体的对比研究

摘要 以硝酸盐起始溶液和碳酸氢铵（AHC）为沉淀剂，通过正反共沉淀法合成了纯钇铝石榴石（YAG）纳米颗粒。通过XRD、TG-DTA、FTIR、FESEM、TEM、EDS和BET分析，研究了滴定方法对粉末相演变、热行为、沉淀物组成、形貌和化学键的影响。结果表明，在正常方法中，与通过反向方法获得的碳酸盐含量更高的更均匀的蓬松沉淀物相比，沉淀物由相对致密的颗粒组成。通过反向方法获得的前体在 900 °C 下煅烧后形成较少团聚和较小尺寸的 YAG 粉末。煅烧的纳米粉末通过放电等离子烧结（SPS）技术在 1350°C 下处理 10 分钟，没有任何烧结助剂或分散剂。两种粉末的烧结形成了高密度和精细亚微米结构的 YAG 陶瓷。然而，与普通纳米粉末相比，通过反向共沉淀纳米粉末 SPS 生产的 YAG 陶瓷显示出更高的透明度（680 nm 为 43%，近红外范围为 58%）和更精细的微观结构（晶粒尺寸约为 210 nm）。共沉淀的纳米颗粒。