2-xGdxTi2O7/Cu復(fù)合材料固化體。以Gd作為三價(jià)錒系核素的模擬物,設(shè)計(jì)Gd取代Y2-xGdxTi2O7燒綠石中的Y位。研究結(jié)果表明,Gd能完全取代Y位形成Gd2Ti2O7 燒綠石,所得產(chǎn)物沒(méi)有雜質(zhì)相的出現(xiàn),且在燒綠石基體中沒(méi)有出現(xiàn)相分離現(xiàn)象。選擇Gd1.0樣品進(jìn)行浸出實(shí)驗(yàn),結(jié)果表明該樣品具有優(yōu)異的水熱穩(wěn)定性,Cu, Y 和 Gd 元素的42天歸一化浸出率分別低至 2.4×10-2, 1.1×10-5和5.3×10-6 g?m-2?d-1。"/>

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燃燒反應(yīng)制備Y2-xGdxTi2O7 燒綠石及其作為核廢物固化材料的穩(wěn)定性研究
作者:
作者單位:

1.西南科技大學(xué);2.中國(guó)工程物理研究院

作者簡(jiǎn)介:

通訊作者:

中圖分類號(hào):

TM286

基金項(xiàng)目:

國(guó)家自然科學(xué)基金 (No. 51672228）


Combustion reaction synthesis of Y2-xGdxTi2O7 pyrochlores and its aqueous durability as nuclear waste mateiral
Author:
Affiliation:

1.State Key Laboratory of Environment-friendly Energy Materials,Southwest University of Science and Technology,Mianyang;2.Institute of Nuclear Physics and Chemistry,China Academy of Engineering Physics

Fund Project:

National Natural Science Foundation of China (No. 51672228）

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    摘要:

    燒綠石基陶瓷材料是理想的核廢物固化基材,本研究采用燃燒反應(yīng)結(jié)合快速加壓工藝,以CuO 為氧化劑、Ti為還原劑,在5分鐘內(nèi)快速制備出燒綠石基 Y2-xGdxTi2O7/Cu復(fù)合材料固化體。以Gd作為三價(jià)錒系核素的模擬物,設(shè)計(jì)Gd取代Y2-xGdxTi2O7燒綠石中的Y位。研究結(jié)果表明,Gd能完全取代Y位形成Gd2Ti2O7 燒綠石,所得產(chǎn)物沒(méi)有雜質(zhì)相的出現(xiàn),且在燒綠石基體中沒(méi)有出現(xiàn)相分離現(xiàn)象。選擇Gd1.0樣品進(jìn)行浸出實(shí)驗(yàn),結(jié)果表明該樣品具有優(yōu)異的水熱穩(wěn)定性,Cu, Y 和 Gd 元素的42天歸一化浸出率分別低至 2.4×10-2, 1.1×10-5和5.3×10-6 g?m-2?d-1。

    Abstract:

    Pyrochlore-based ceramic is recognized as promising nuclear waste matrice. In this study, pyrochlore-based Y2-xGdxTi2O7/Cu composite waste forms were rapidly prepared within 5 minutes by combustion reaction plus quick pressing (CR/QP) synthesis route, where CuO was utilized as the oxidant and Ti as the reductant. As the surrogate of trivalent actinide nuclides, Gd was introduced to substitute the Y site with nominal formulation of Y2-xGdxTi2O7. The results demonstrate that Gd can totally replace the Y site and Gd2Ti2O7 pyrochlore can be readily synthesized. There is no impurity phase generated in the products, and phase separation is not detected in the pyrochlore matrix. The selected Gd1.0 waste form exhibits promising aqueous durability as the 42 days normalized leaching rates of Cu, Y and Gd elements are evaluated as low as 2.4×10-2, 1.1×10-5 and 5.3×10-6 g.m-2.d-1.

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張魁寶,李偉偉,謝達(dá)雁,駱寶珠,張海斌.燃燒反應(yīng)制備Y2-xGdxTi2O7 燒綠石及其作為核廢物固化材料的穩(wěn)定性研究[J].稀有金屬材料與工程,2020,49(7):2299~2304.[Kuibao Zhang, Weiwei Li, Dayan Xie, Baozhu Luo, Haibin Zhang. Combustion reaction synthesis of Y2-xGdxTi2O7 pyrochlores and its aqueous durability as nuclear waste mateiral[J]. Rare Metal Materials and Engineering,2020,49(7):2299~2304.]
DOI：10.12442/j. issn.1002-185X.20190354

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  • 收稿日期:2019-04-25
  • 最后修改日期:2019-05-22
  • 錄用日期:2019-05-29
  • 在線發(fā)布日期: 2020-08-31
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