Self-propagating high-temperature synthesis of Y2Ti2O7 pyrochlore and its aqueous durability

Self-propagating high-temperature synthesis of Y2Ti2O7 pyrochlore and its aqueous durability
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Y2Ti2O7烧绿石的自蔓延高温合成及其水相耐久性

DOI:
10.1016/j.jnucmat.2015.05.055
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发表时间:
2015-10
影响因子:
3.1
通讯作者:
Yuancheng Teng
Yuancheng Teng
中科院分区:
工程技术2区
文献类型:
--
作者:
Kuibao Zhang;Guanjun Wen;Haibin Zhang;Yuancheng Teng

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在本研究中,采用自蔓延高温合成快速压制(SHS/QP)技术,在5分钟内即可制备出高致密化的Y2Ti2O7烧绿石废料。氧化剂为Fe2O_3,还原剂为钛。所制备的样品具有类似于Y2Ti2O7芯和Fe包层的自包裹形貌。合成的焦绿石基废物模体具有5.35微克/立方厘米的高密度和11.5微克/立方厘米的维氏硬度,以及优异的耐水性。28天Y、Ti、Fe的归一化浸出率分别低至1.07亿×10−6、6.63亿×10−5和1.42亿×10−5g/m−2d−1。
In this study, highly densified Y2Ti2O7pyrochlore waste forms were readily prepared within 5 min by self-propagating high-temperature synthesis plus quick pressing (SHS/QP). Fe2O3was employed as the oxidant with Ti as the reductant. The as-prepared sample exhibits an analogous self-encapsulated morphology with Y2Ti2O7core and Fe cladding. The synthesized pyrochlore-based waste form possesses high density of 5.35 g/cm3and Vickers hardness of 11.5 ± 0.2 GPa, as well as excellent aqueous durability. The 28 days normalized leaching rates of Y, Ti and Fe are as low as 1.07 × 10−6, 6.63 × 10−5and 1.42 × 10−5g m−2d−1.
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发表时间: 2006-08-01
影响因子: 3.1
作者:
Caurant, D.;Majerus, O.;Dussossoy, J. L.
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