Structure and Optical Property of Pr2O3 Powder Prepared by Reduction
Source abstract
Abstract
还原制备 Pr 2 O 3 粉体及其结构和光学性能研究 顾军毅 1,2 , 范武刚 2 , 张兆泉 2 , 姚 琴 2 , 展红全 1 (1.景德镇陶瓷大学 材料科学与工程学院, 景德镇 333403; 2. 中国科学院 上海硅酸盐研究所, 上海 200050) 摘 要: 镨的倍半氧化物(Pr 2 O 3 )是合成荧光粉和激光增益介质的重要原料, 由于其易发生镨的变价并在空气中吸水 而受到的关注较少。 本研究采用不同表征手段研究在空气和在氩氢混合气氛下 Pr 6 O 11 还原为 Pr 2 O 3 的过程机理以及 两种粉体的物相、微观形貌、粒度及价态等, 并进一步分析以上两种氧化镨的发光特性与镨的价态关系。结果表明: 两种气氛下氧化镨的相变过程显著不同, 还原性的 Ar/H 2 气氛可以加快 Pr 6 O 11 的还原过程, 在 800 ℃即可得到 Pr 2 O 3 。含 Pr 3+ 的 Pr 2 O 3 除了导带到价带跃迁导致的紫外吸收外, 还存在因 f→f 跃迁引发的可见光波段的吸收, 而 Pr 6 O 11 对波长超过 320 nm 的紫外-可见光有较强吸收, 这与 Pr 4+ 和氧之间电荷转移有关。Pr 2 O 3 的荧光发射光谱中 的宽谱带显示 Pr 3+ 的 4f5d 轨道的最低能级在 1 S 0 之下, 同时含 Pr 4+ 的 Pr 6 O 11 在 404 nm 处的荧光强度降低 63%, 这 归因于 Pr 3+ /Pr 4+ 之间的能量耗散。 这种荧光性能的差异可用于含谱的高氧离子迁移率陶瓷或晶体中 Pr 的价态分析。
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OpenAlex topics: Catalysis and Oxidation Reactions · Luminescence Properties of Advanced Materials · Nuclear materials and radiation effects
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