Influence of powders calcination temperatures under hydrogen on the microstructures and properties of Gd2O2S:Pr,Ce scintillation ceramics

IF 44 1区医学 Q1 ENDOCRINOLOGY & METABOLISM

The Lancet Diabetes & Endocrinology Pub Date : 2024-10-10 DOI:10.1016/j.ceramint.2024.10.124

Dong Huang, Qiang Liu, Danyang Zhu, Junlin Wu, Chen Hu, Warut Chewpraditkul, Weerapong Chewpraditkul, Jiang Li

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Abstract

The precursor of Gd₂O₂S:Pr,Ce powders with stacked layered structure was synthesized in hot water bath using oxide powders and concentrated sulfuric acid as raw materials. The powders were synthesized by calcining the precursor under flowing H₂ atmosphere at 500-900^oC for 3 h. The influence of calcination temperatures under hydrogen atmosphere, which was defined as reduction temperature, on the microstructures and properties of powders was investigated. Using the synthesized powders as initial material, Gd₂O₂S:Pr,Ce scintillation ceramics with high relative density (over 98% of the theoretical value) were fabricated through vacuum pre-sintering at 1350^oC for 3 h followed by HIP post-treatment in an argon atmosphere at 1450^oC for 3 h. Intense green emission line at 511 nm due to the ³P₀→³H₄ transition of Pr³⁺ was obtained in the X-ray excited luminescence (XEL) spectra of all Gd₂O₂S:Pr,Ce ceramics. The Gd₂O₂S:Pr,Ce ceramics fabricated from powders synthesized at 700^oC showed the highest optical transmittance, XEL intensity, and light yield (LY) value of 24,660 ph/MeV @ 662 keV γ rays. The photoluminescence decay time of Pr³⁺ ³P₀ → ³H₄ transition and scintillation decay time were measured to be ∼3 μs for all Gd₂O₂S:Pr,Ce ceramics. The effect of reduction temperature on optical transmittance and LY of Gd₂O₂S:Pr,Ce ceramics was also discussed.

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氢气环境下的粉末煅烧温度对 Gd2O2S:Pr,Ce 闪烁陶瓷微观结构和性能的影响

以氧化物粉末和浓硫酸为原料，在热水浴中合成了具有叠层结构的 Gd2O2S:Pr,Ce 粉末前驱体。研究了氢气环境下煅烧温度（即还原温度）对粉末微观结构和性能的影响。以合成的粉末为初始材料，在 1350 摄氏度下真空预烧结 3 小时，然后在 1450 摄氏度的氩气环境中进行 HIP 后处理 3 小时，制备出了具有高相对密度（理论值的 98% 以上）的 Gd2O2S:Pr,Ce 闪烁陶瓷。在所有 Gd2O2S:Pr,Ce 陶瓷的 X 射线激发发光（XEL）光谱中，都能看到 511 纳米波长处因 Pr3+ 的 3P0→3H4 转变而产生的强烈绿色发射线。用在 700oC 下合成的粉末制造的 Gd2O2S:Pr,Ce 陶瓷显示出最高的透光率、XEL 强度和光产率（LY）值（24,660 ph/MeV @ 662 keV γ 射线）。所有 Gd2O2S:Pr,Ce 陶瓷的 Pr3+ 3P0 → 3H4 转变的光致发光衰减时间和闪烁衰减时间均为∼3 μs。此外，还讨论了还原温度对 Gd2O2S:Pr,Ce 陶瓷的透光率和 LY 的影响。

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来源期刊

The Lancet Diabetes & Endocrinology ENDOCRINOLOGY & METABOLISM-

CiteScore

61.50

自引率

1.60%

发文量

371

期刊介绍： The Lancet Diabetes & Endocrinology, an independent journal with a global perspective and strong clinical focus, features original clinical research, expert reviews, news, and opinion pieces in each monthly issue. Covering topics like diabetes, obesity, nutrition, and more, the journal provides insights into clinical advances and practice-changing research worldwide. It welcomes original research advocating change or shedding light on clinical practice, as well as informative reviews on related topics, especially those with global health importance and relevance to low-income and middle-income countries. The journal publishes various content types, including Articles, Reviews, Comments, Correspondence, Health Policy, and Personal Views, along with Series and Commissions aiming to drive positive change in clinical practice and health policy in diabetes and endocrinology.