Rapid synthesis of Gd2Zr2O7 ceramics by flash sintering and its aqueous durability

Xu, Chen; Wang, Lixiao; Bai, Bin; Peng, Le; Cai, Shikui

doi:10.1016/j.jeurceramsoc.2019.11.060

Cited by 36 publications

(20 citation statements)

References 34 publications

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“…Stage III is a special state achieved during the flash sintering process, where the temperature attains a steady state and sample shrinks gradually as holding time lasts. This is consistent with our previous work 22 …”

Section: Resultssupporting

confidence: 94%

Rapid synthesis of Li₄Ti₅O₁₂ as lithium‐ion battery anode by reactive flash sintering

et al. 2021

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In this work spinel Li4Ti5O12 (LTO) was successfully synthesized via flash sintering technique at a furnace temperature of 580°C within only 5 min for the first time. Phase evolution, microstructures, and electrochemical properties were investigated and compared with conventionally synthesized LTO. The flash sintered LTO shows good crystallinity, high purity, and small particle size. More importantly, it suggests that the flash sintering process could help inhibit lithium volatilization and control the particle size, which is vital to the improvement of the lithium‐ion diffusion process and battery performance. Compared with the conventionally synthesized samples, the flash sintered LTO exhibits higher specific capacities, better cycling stabilities, and rate capabilities. Therefore, flash sintering shows potentials in improving the electrochemical performance of anode materials, and thus suggests an efficient strategy for rapid synthesis of high‐performance anode materials for lithium‐ion batteries.

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Section: Resultssupporting

confidence: 94%

Rapid synthesis of Li₄Ti₅O₁₂ as lithium‐ion battery anode by reactive flash sintering

et al. 2021

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“…The leaching resistance of the sintered matrix is significant for nuclides. 28,29 In this work, the chemical durability of the radioactive-contaminated soil matrix was assessed by static leaching experiments (Product Consistency Test, PCT). 30 The powders (75-150 μm) were obtained through the crushing and sieving process.…”

Section: Leaching Experimentsmentioning

confidence: 99%

Mechanical and leaching properties of neodymium‐contaminated soil glass‐ceramics

Wei

Shi

et al. 2021

J Am Ceram Soc

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The safe treatment of radioactive‐contaminated soil is of great significance. In this work, neodymium‐contaminated soil was successfully immobilized using microwave sintering to form glass‐ceramics. The microstructure, morphology, elemental distribution, Vickers hardness, and chemical durability of the sintered samples were analyzed. The results showed that the glass‐ceramic is more suitable to immobilize the waste compared with the glass matrix. XRD and SEM‐EDS results proved that the waste form has been totally immobilized in the sintered matrix whether in glass‐ceramics and glass. However, the leaching rate of element Nd in glass‐ceramic was lower than the glass matrix at 28 d. Moreover, the Vickers hardness results of glass‐ceramic were higher than that of glass. Thus, glass‐ceramics can not only reduce sintering temperature and save energy but also achieve a better immobilizing effect. Our investigation reflects that glass‐ceramics are more suitable for neodymium‐contaminated soil immobilization using the microwave sintering method.

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“…In general, the fabricated (Gd,A) 2 (Zr,B) 2 O 7 waste form showed a considerable chemical durability as compared with reported results (Table 5). 22,25‐27 …”

Section: Resultsmentioning

confidence: 99%

“…12 Among these ceramics, pyrochlore is commonly employed to immobilize nuclear waste due to its high thermal stability, 13,14 high thermodynamic stability, 15,16 high chemical durability, 17,18 and physical stability. 15,[19][20][21] In recent years, a series of treatment methods have been developed for incorporating TRPO waste using pyrochlore, including solid reaction method with simple operation, 22,23 self-propagating high-temperature synthesis plus quick pressing method with fast reaction, 24,25 microwave sintering with fast heating rate and low energy consumption, 26 flash sintering with extremely short sintering time, 27 and spark plasma sintering (SPS). [28][29][30][31] SPS has the advantages of fast heating rate and short holding time, which makes it widely used to solidify radionuclides.…”

Section: Introductionmentioning

confidence: 99%

Effect of improved trialkyl phosphine oxides waste content on phase composition and density of spark plasma sintered Gd ₂ Zr ₂ O ₇ ceramics

Wei

Wen³

et al. 2021

Int J Energy Res

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As a rapid sintering method, spark plasma sintering (SPS) process has been widely applied to immobilize nuclear waste. In this work, trialkyl phosphine oxides (TRPO) were immobilized by the mixture of Gd 2 O 3 and ZrO 2 with SPS proceedings at 1650 C in 3 minutes. X-ray diffraction results present that the solid solubility is 10 to 20 wt% and all the sintered samples show a fluorite structure. Raman spectroscopy results show that the order degree of structure decreases as waste content increases. The lattice parameters decrease with the increasing doped waste content indicating the success of waste immobilization. Densities decrease for the sample with higher waste content which mainly caused by the existence of pores. Scanning electron microscope-energy dispersive X-ray spectroscopy and backscattered electron results perform the microstructure of the sintered sample. Furthermore, the leaching test shows that the sample has a considerable chemical stability. This study confirmed the possibility of rapid consolidation of Gd 2 Zr 2 O 7 bulk, dense ceramic with up to 10~20 wt% of immobilized TRPO waste. Highlights• Multi-nuclides waste was rapidly immobilized by Gd 2 Zr 2 O 7 via SPS process.• Phase transition happened with enhanced doping content.• Density results decreased with the higher waste content.• The order degree of structure decreased as waste content increased.• The sintered matrix represented considerable chemical stability. K E Y W O R D S ceramic, Gd 2 Zr 2 O 7 , immobilization, SPS, TRPO waste Ningning He and Guilin Wei contributed equally to this work.

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Rapid synthesis of Gd2Zr2O7 ceramics by flash sintering and its aqueous durability

Cited by 36 publications

References 34 publications

Rapid synthesis of Li₄Ti₅O₁₂ as lithium‐ion battery anode by reactive flash sintering

Rapid synthesis of Li₄Ti₅O₁₂ as lithium‐ion battery anode by reactive flash sintering

Mechanical and leaching properties of neodymium‐contaminated soil glass‐ceramics

Effect of improved trialkyl phosphine oxides waste content on phase composition and density of spark plasma sintered Gd ₂ Zr ₂ O ₇ ceramics

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Rapid synthesis of Gd2Zr2O7 ceramics by flash sintering and its aqueous durability

Cited by 36 publications

References 34 publications

Rapid synthesis of Li4Ti5O12 as lithium‐ion battery anode by reactive flash sintering

Rapid synthesis of Li4Ti5O12 as lithium‐ion battery anode by reactive flash sintering

Mechanical and leaching properties of neodymium‐contaminated soil glass‐ceramics

Effect of improved trialkyl phosphine oxides waste content on phase composition and density of spark plasma sintered Gd 2 Zr 2 O 7 ceramics

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Product

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Rapid synthesis of Li₄Ti₅O₁₂ as lithium‐ion battery anode by reactive flash sintering

Rapid synthesis of Li₄Ti₅O₁₂ as lithium‐ion battery anode by reactive flash sintering

Effect of improved trialkyl phosphine oxides waste content on phase composition and density of spark plasma sintered Gd ₂ Zr ₂ O ₇ ceramics