Study of the Hydrolytic Stability of Fine-Grained Ceramics Based on Y2.5Nd0.5Al5O12 Oxide with a Garnet Structure under Hydrothermal Conditions

被引：11

作者：

Alekseeva, Liudmila ^{[1
]}

Nokhrin, Aleksey ^{[1
]}

Boldin, Maksim ^{[1
]}

Lantsev, Eugeniy ^{[1
]}

Murashov, Artem ^{[1
]}

Orlova, Albina ^{[1
]}

Chuvil'deev, Vladimir ^{[1
]}

机构：

[1] Lobachevsky State Univ Nizhny Novgorod, Physicotech Res Inst, Mat Sci Dept, Nizhnii Novgorod 603022, Russia

来源：

MATERIALS | 2021年 / 14卷 / 09期

基金：

俄罗斯基础研究基金会;

关键词：

ceramic matrices; immobilization of radioactive wastes; garnet; hydrolytic tests; leaching mechanism; NUCLEAR-WASTE FORMS; PLASMA; RADIATION; IMMOBILIZATION; FABRICATION; DIFFUSION; RESISTANCE; MATRICES; NZP; ND;

D O I：

10.3390/ma14092152

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The hydrolytic stability of ceramics based on Y2.5Nd0.5Al5O12 oxide with a garnet structure obtained by the spark plasma sintering (SPS) method has been studied. The tests were carried out in distilled water under hydrothermal conditions in an autoclave and, for comparison, in a static mode at room temperature. The mechanism of leaching of Y and Nd from the ceramics was investigated. It has been shown that at "low" temperatures (25 and 100 degrees C), the destruction of pores occured, and the intensity of the leaching process was limited by the diffusion of ions from the inner part of the sample to the surface. At "high" test temperatures (200 and 300 degrees C), intense destruction of the ceramic grain boundaries was observed. It was assumed that the accelerated leaching of neodymium is due to the formation of grain-boundary segregations of Nd3+ in sintered ceramics.

引用

页数：11

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