Self-propagating synthesis, mechanical property and aqueous durability of Gd2Ti2O7 pyrochlore

Peng, Le; Zhang, Kuibao; Yin, Dan; Wu, Jun; He, Shihong; He, Heming

doi:10.1016/j.ceramint.2016.09.040

Cited by 22 publications

(9 citation statements)

References 40 publications

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“…It is interesting to note that the center temperature of Zr-0 sample is 1551 ℃, which is lower than that of Zr-5 (1702 ) and Zr ℃ -15 (1661 ) ℃ samples. The result is in good agreement with previous report that TiO 2 (5.60 wt% TiO 2 in Zr-0 specimen) can regulate the combustion reactivity and generated temperature [9]. Besides, it also can be observed in Fig.…”

Section: Temperature and Powder Xrd Analysissupporting

confidence: 93%

“…Figure 5(b) shows that a big dark-gray phase is metallic Cu, which was demonstrated by the XRD and subsequent EDX results. With the delay time increases, it is important to note that Cu is squeezed out to the edge of samples with dispersed small particles, which is in good agreement with the results of synthesis GTO in our previous work [9]. As indicated above, due to no big pores or cracks from Fig.…”

Section: Temperature and Powder Xrd Analysissupporting

confidence: 90%

“…5(f), the bulk density and Vickers rdness keep on a rise with the extension of time. The highest bulk density and Vickers hardness of 26 s specimen are 6.25 g/cm 3 and 10.81 GPa respectively, which are higher than that of GTO/Cu composite ceramic prepared in previous work (5.53 g/cm 3 , 10.48 GPa) [9]. It can be observed in Fig.…”

Section: Temperature and Powder Xrd Analysismentioning

confidence: 59%

“…Thus, a variety of technologies are under investigation, including SHS method [28,29]. However, SHS also faces its own limitation: the generated high temperature and high reaction speed that may cause this progress hardly to be controlled [8,9,30].…”

Section: Introduction mentioning

confidence: 99%

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Self-propagating high-temperature synthesis of ZrO2 incorporated Gd2Ti2O7 pyrochlore

Peng

Zhang

et al. 2017

J Adv Ceram

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In this research, Zr-doped Gd 2 Ti 2 O 7 pyrochlores, with the composition of Gd 2 (Ti 1x Zr x) 2 O 7 , were firstly synthesized by self-propagating high-temperature synthesis plus quick pressing (SHS/QP) using CuO as the oxidant and Ti as the reductant. To improve the radiation resistance of titanate-pyrochlore, up to 35 at% Zr was incorporated to substitute the Ti site of Gd 2 Ti 2 O 7 pyrochlore (Gd 2 (Ti 0.75 Zr 0.35) 2 O 7). XRD and SEM microstructural characterizations showed the formation of a composite ceramic with the major pyrochlore phase and the minor Cu phase. The generated temperature of samples decreased from 1702 to 1011 ℃ with increasing Zr content. The effects of sintering temperature and pressure time on phase composition and microstructure were systematically studied. Besides, the influence of thermal transmission on the whole combustion process was also explored. The pyrochlore-based waste form possessed high bulk density of 6.25 g/cm 3 and Vickers hardness of 10.81 GPa. The MCC-1 leaching test showed the normalized elemental leaching rates (42 d) of Cu, Gd, and Zr are 1.27×10 2 , 1.33×10 3 , and 8.44×10 7 g•m 2 •d 1 , respectively.

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Section: Temperature and Powder Xrd Analysissupporting

confidence: 93%

Section: Temperature and Powder Xrd Analysissupporting

confidence: 90%

Section: Temperature and Powder Xrd Analysismentioning

confidence: 59%

Section: Introduction mentioning

confidence: 99%

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Self-propagating high-temperature synthesis of ZrO2 incorporated Gd2Ti2O7 pyrochlore

Peng

Zhang

et al. 2017

J Adv Ceram

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“…Synroc is mainly composed of multiple titanate mineral phases, such as zirconolite (CaZrTi 2 O 7 ), pyrochlore (A 2 B 2 O 6 X), perovskite (CaTiO 3 ), hollandite (BaAl 2 Ti 6 O 16 ), rutile (TiO 2 ), spinel (AB 2 O 4 ), et al These mineral phases have accommodated actinide elements in the natural environment for over tens of millions of years. According to the theory of isomorphism substitution, radioactive nuclides can be included into the lattice structure of above-mentioned mineral phases, which can significantly promote the waste loading and long-term stability [17,18,19,20,21,22,23].…”

Section: Introductionmentioning

confidence: 99%

Self-Propagating Synthesis and Characterization Studies of Gd-Bearing Hf-Zirconolite Ceramic Waste Forms

Zhang

Yin

et al. 2019

Materials

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Synroc is recognized as the second-generation waste matrice for nuclear waste disposal. Zirconolite is one of the most durable Synroc minerals. In this study, Gd and Hf were selected as the surrogates of trivalent and tetravalent actinide nuclides. Gd-bearing Hf-zirconolite (Ca1−xHf1−xGd2xTi2O7) ceramic waste forms were rapidly synthesized from a self-propagating technique using CuO as the oxidant. The results indicate that Gd can concurrently replace the Ca and Hf sites. However, Gd2O3 could not completely be incorporated into the lattice structure of zirconolite when the x value is higher than 0.8. The aqueous durability of selected Gd-Hf codoped sample (Hf-Gd-0.6) was tested, where the 42 days normalized leaching rates (LRi) of Ca, Cu, Gd and Hf are measured to be 1.57, 0.13, 4.72 × 10−7 and 1.59 × 10−8 g·m−2·d−1.

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A novel CeO2/MgAl2O4 composite coating for the protection of AZ31 magnesium alloys

Peng

Qiao

Jin³

et al. 2019

J Mater Sci

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Self-propagating synthesis, mechanical property and aqueous durability of Gd2Ti2O7 pyrochlore

Cited by 22 publications

References 40 publications

Self-propagating high-temperature synthesis of ZrO2 incorporated Gd2Ti2O7 pyrochlore

Self-propagating high-temperature synthesis of ZrO2 incorporated Gd2Ti2O7 pyrochlore

Self-Propagating Synthesis and Characterization Studies of Gd-Bearing Hf-Zirconolite Ceramic Waste Forms

A novel CeO2/MgAl2O4 composite coating for the protection of AZ31 magnesium alloys

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