Pyrochlore type high-entropy oxide solidified body and preparation method thereof

A technology of oxides and solidified bodies, which is applied in the field of pyrochlore-type high-entropy oxide solidified bodies and its preparation, can solve the problems of not being able to solidify multiple radionuclides at one time, and achieve excellent chemical stability, high-efficiency solidification, and a preparation process simple effect

Active Publication Date: 2020-08-14
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although pyrochlore Gd 2 Zr 2 o 7 Ceramic cured body has the above advantages, however, Gd 2 Zr 2 o 7 The ceramic solidified body has a strong selectivity to radionuclides, and can only selectively solidify some radionuclides with a single valence state and ionic radius (such as Pu 3+ 、Am 3+ 、Cm 3+ and Np 3+ and other nuclides), cannot solidify multiple radionuclides in nuclear waste at one time [Rodney C.Ewing, et al., Journal of Applied Physics 95(2004) 5949-5972]
However, there is no information about pyrochlore structure RE 2 B 2 o 7 Research report on high-entropy ceramic nuclear waste solidified body

Method used

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  • Pyrochlore type high-entropy oxide solidified body and preparation method thereof
  • Pyrochlore type high-entropy oxide solidified body and preparation method thereof
  • Pyrochlore type high-entropy oxide solidified body and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0037] The preparation method of pyrochlore type high entropy oxide solidified body:

[0038] Will Y 2 o 3 , La 2 o 3 、Nd 2 o 3 Raw powder (~ particle size 1μm, purity >99wt%, Shanghai Diyang Industrial Co., Ltd.) and TiO 2 , ZrO 2 , HfO 2 (~Particle size 0.2 μm, purity>99wt%, Sinopharm Chemical Reagent Co., Ltd.) Dosing at a molar ratio of 1:1:1:2:2:2. With ethanol as the medium, ZrO 2 The ball is a grinding ball, and the ball mill is mixed at a speed of 560 rpm for 8 hours on a planetary ball mill, and then a dry mixed powder with a uniform composition is obtained by rotary evaporation; the obtained mixed powder is first dry-pressed at 5 MPa, and then cooled at 50 MPa. Isostatic pressing, the green body is put into an alumina crucible, and then placed in a muffle furnace. In an air atmosphere, the temperature is raised at a rate of 1°C / min, and sintered at 1300°C for 1h to prepare a high-entropy oxide solidified body.

[0039] After analysis: the XRD spectrum of th...

Embodiment 2

[0041] The preparation method of pyrochlore type high entropy oxide solidified body:

[0042] Will Y 2 o 3 , La 2 o 3 、Nd 2 o 3 Raw powder (~ particle size 5μm, purity >99wt%, Shanghai Diyang Industrial Co., Ltd.) and TiO 2 , ZrO 2 , HfO 2 , Nb 2 o 5 Powder (~ particle size 0.5μm, purity >99wt%, Sinopharm Chemical Reagent Co., Ltd.) is compounded at a molar ratio of 1:1:1:2:2:2:1, with ethanol as the medium, ZrO 2 The ball is a grinding ball, and the ball milling is carried out on a planetary ball mill at a speed of 500 rpm for 16 hours, and a dry mixed powder with a uniform composition is obtained by rotary evaporation; the obtained mixed powder is first dry-pressed at 10MPa, and then cooled at 100MPa Isostatic pressing, the green body is put into an alumina crucible, and then placed in a muffle furnace. In an air atmosphere, the temperature is raised at a rate of 10°C / min, and sintered at 1400°C for 3h to prepare a high-entropy oxide solidified body.

[0043] Afte...

Embodiment 3

[0045] The preparation method of pyrochlore type high entropy oxide solidified body:

[0046] Will Y 2 o 3 , La 2 o 3 、Nd 2 o 3 Raw powder (~ particle size 10μm, purity >99wt%, Shanghai Diyang Industrial Co., Ltd.) and TiO2 , ZrO 2 , HfO 2 , Nb 2 o 5 、TaO 2 Powder (~ particle size 1.0 μm, > purity 99wt%, Sinopharm Chemical Reagent Co., Ltd.) is compounded at a molar ratio of 1:1:1:2:2:2:1:2, with ethanol as the medium, ZrO 2 The ball is a grinding ball, and the ball mill is mixed at a speed of 450 rpm for 20 hours on a planetary ball mill, and a dry mixed powder with uniform components is obtained by rotary evaporation; the obtained mixed powder is first dry-pressed at 15MPa, and then cooled at 200MPa Isostatic pressing, the green body is put into an alumina crucible, and then placed in a muffle furnace. In an air atmosphere, the temperature is raised at a rate of 15°C / min, and sintered at 1500°C for 8h to prepare a high-entropy oxide solidified body.

[0047] After...

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Abstract

The invention relates to a pyrochlore type high-entropy oxide solidified body and a preparation method thereof. The high-entropy oxide solidified body has a pyrochlore structure, and the chemical formula is RE2M2O7, wherein RE is a rare earth element, and M is a transition metal element. The pyrochlore-type high-entropy oxide solidified body of the invention has excellent chemical stability. Radioactive nuclides of different valence states and types can be solidified in crystal lattices of a high-entropy oxide base material, deep geological disposal is facilitated, , and the system of solidification treatment of base materials for radioactive nuclear waste is enriched. The method is low-cost, is simple and feasible and has a wide application range. The process is high in efficiency and good in safety, and is expected to be applied to the technical field of radioactive nuclear waste treatment.

Description

technical field [0001] The invention belongs to the field of nuclear waste treatment materials and preparation thereof, in particular to a pyrochlore-type high-entropy oxide solidified body and a preparation method thereof. Background technique [0002] Nuclear energy is an efficient and clean energy, and nuclear technology is widely used in nuclear power, scientific research and military fields. However, with the development of the nuclear industry, the discharge of nuclear waste is increasing day by day, which seriously threatens the ecological environment of the earth and the survival of human beings. Therefore, the safe storage and disposal of radioactive waste has become one of the key issues to be solved urgently in the field of nuclear energy, which is also the key to further realize the possible sustainable development of nuclear energy. [0003] The usual disposal method is to directly immobilize radioactive waste in an inert matrix, and then store the solidified m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B35/49C04B35/495
CPCC04B35/49C04B35/495C04B35/50C04B2235/3224C04B2235/3225C04B2235/3227C04B2235/3229C04B2235/3244C04B2235/96
Inventor 张国军周林李飞刘吉轩
Owner DONGHUA UNIV
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