L. S. Alekseeva, A. V. Nokhrin, A. I. Orlova, M. S. Boldin, A. V. Voronin, A. A. Murashov, V. N. Chuvil’deev
{"title":"基于钕0.33Zr2(PO4)3磷酸盐的细粒陶瓷在高温下的化学稳定性","authors":"L. S. Alekseeva, A. V. Nokhrin, A. I. Orlova, M. S. Boldin, A. V. Voronin, A. A. Murashov, V. N. Chuvil’deev","doi":"10.1134/S2075113324700862","DOIUrl":null,"url":null,"abstract":"<p>The chemical stability of Nd<sub>0.33</sub>Zr<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub> fine-grained ceramics, which can be used for immobilization of rare earth elements (REE) that are part of high-level waste was studied. Single-phase Nd<sub>0.33</sub>Zr<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub> submicron powders with the structure of the mineral kosnarite were prepared by colloid-chemical synthesis. Powders were prepared by successive annealing at 600, 800, and 900°C for 6 h at each stage. Nd<sub>0.33</sub>Zr<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub> ceramic was Nd<sub>0.33</sub>Zr<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub> ceramics was produced using spark plasma sintering method (SPS). The relative density of the ceramic was 89.9%; the average grain size was 5–20 μm. The chemical stability of the ceramic in the static mode at 90°C in distilled water and mineral water, as well as in acidic media (0.1 M HCl) and alkaline media (0.01 M NaOH), was studied. The ceramics have high hydrolytic stability. The influence of the contact medium on the rate and mechanism of Nd leaching from the surface of Nd<sub>0.33</sub>Zr<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub> fine-grained ceramic samples was studied. The de Groot-van der Sloot model was used to analyze the resulting leaching rate <i>R</i><sub><i>i</i></sub> against time <i>t</i> of experiment. Nd leaching occurs by dissociation of Nd from the ceramic surface in acidic medium, diffusion from the inner layers in alkaline medium and mineral water, and dissolution of the ceramic surface layer in distilled water.</p>","PeriodicalId":586,"journal":{"name":"Inorganic Materials: Applied Research","volume":"15 5","pages":"1256 - 1264"},"PeriodicalIF":0.5000,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Chemical Stability of Fine-Grained Ceramics Based on Nd0.33Zr2(PO4)3 Phosphate with Kosnarite Structure at Elevated Temperatures\",\"authors\":\"L. S. Alekseeva, A. V. Nokhrin, A. I. Orlova, M. S. Boldin, A. V. Voronin, A. A. Murashov, V. N. 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引用次数: 0
摘要
研究了 Nd0.33Zr2(PO4)3 细粒陶瓷的化学稳定性，这种陶瓷可用于固定高浓度废物中的稀土元素（REE）。研究人员通过胶体化学合成法制备了具有柯斯纳石矿物结构的单相 Nd0.33Zr2(PO4)3 亚微米粉末。粉末的制备过程是在 600、800 和 900°C 温度下连续退火 6 小时。采用火花等离子烧结法（SPS）制备了 Nd0.33Zr2(PO4)3 陶瓷。陶瓷的相对密度为 89.9%，平均晶粒尺寸为 5-20 μm。研究了陶瓷在蒸馏水、矿泉水、酸性介质（0.1 M HCl）和碱性介质（0.01 M NaOH）中 90°C 静态模式下的化学稳定性。陶瓷具有很高的水解稳定性。研究了接触介质对 Nd0.33Zr2(PO4)3 细粒陶瓷样品表面钕浸出速率和机制的影响。采用 de Groot-van der Sloot 模型分析了实验结果与时间 t 的浸出率 Ri。在酸性介质中，钕从陶瓷表面解离；在碱性介质和矿泉水中，钕从陶瓷内层扩散；在蒸馏水中，陶瓷表层溶解。
Chemical Stability of Fine-Grained Ceramics Based on Nd0.33Zr2(PO4)3 Phosphate with Kosnarite Structure at Elevated Temperatures
The chemical stability of Nd0.33Zr2(PO4)3 fine-grained ceramics, which can be used for immobilization of rare earth elements (REE) that are part of high-level waste was studied. Single-phase Nd0.33Zr2(PO4)3 submicron powders with the structure of the mineral kosnarite were prepared by colloid-chemical synthesis. Powders were prepared by successive annealing at 600, 800, and 900°C for 6 h at each stage. Nd0.33Zr2(PO4)3 ceramic was Nd0.33Zr2(PO4)3 ceramics was produced using spark plasma sintering method (SPS). The relative density of the ceramic was 89.9%; the average grain size was 5–20 μm. The chemical stability of the ceramic in the static mode at 90°C in distilled water and mineral water, as well as in acidic media (0.1 M HCl) and alkaline media (0.01 M NaOH), was studied. The ceramics have high hydrolytic stability. The influence of the contact medium on the rate and mechanism of Nd leaching from the surface of Nd0.33Zr2(PO4)3 fine-grained ceramic samples was studied. The de Groot-van der Sloot model was used to analyze the resulting leaching rate Ri against time t of experiment. Nd leaching occurs by dissociation of Nd from the ceramic surface in acidic medium, diffusion from the inner layers in alkaline medium and mineral water, and dissolution of the ceramic surface layer in distilled water.
期刊介绍：
Inorganic Materials: Applied Research contains translations of research articles devoted to applied aspects of inorganic materials. Best articles are selected from four Russian periodicals: Materialovedenie, Perspektivnye Materialy, Fizika i Khimiya Obrabotki Materialov, and Voprosy Materialovedeniya and translated into English. The journal reports recent achievements in materials science: physical and chemical bases of materials science; effects of synergism in composite materials; computer simulations; creation of new materials (including carbon-based materials and ceramics, semiconductors, superconductors, composite materials, polymers, materials for nuclear engineering, materials for aircraft and space engineering, materials for quantum electronics, materials for electronics and optoelectronics, materials for nuclear and thermonuclear power engineering, radiation-hardened materials, materials for use in medicine, etc.); analytical techniques; structure–property relationships; nanostructures and nanotechnologies; advanced technologies; use of hydrogen in structural materials; and economic and environmental issues. The journal also considers engineering issues of materials processing with plasma, high-gradient crystallization, laser technology, and ultrasonic technology. Currently the journal does not accept direct submissions, but submissions to one of the source journals is possible.
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