Study of the Chemical Stability of Sr0.5Zr2(PO4)3 Phosphate with a Kosnarite Structure in Various Environments

IF 0.9 Q4 CHEMISTRY, INORGANIC & NUCLEAR Radiochemistry Pub Date : 2024-02-19 DOI:10.1134/S1066362223060036

L. S. Alekseeva, A. V. Nokhrin, A. I. Orlova, M. S. Boldin, A. V. Voronin, A. A. Murashov, V. N. Chuvil’deev

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Abstract

Samples of ceramics based on Sr_0.5Zr₂(PO₄)₃ phosphate with the structure of the kosnarite mineral (NaZr₂(PO₄)₃, NZP) were obtained by spark plasma sintering. Submicron phosphate powders with particle sizes less than 1 μm were produced by the sol–gel method. Powders and ceramics have a single-phase NZP structure. The relative density of the ceramics was 97.6%. The chemical stability of the obtained ceramics was studied in static mode at 90°C in distilled and mineral water and in acidic and alkaline environments. The minimum achieved leaching rates were ~10^–4–10^–6 g/(cm² day). The influence of the contact environment on the rate and mechanism of Sr leaching from Sr_0.5Zr₂(PO₄)₃ ceramic samples within 42 days was investigated. It was shown that over testing in distilled water and in mineral water (up to 7 days) Sr leaching occurs due to the dissolution of the surface layer of ceramics and after 7 days of testing in mineral water, due to washing out of Sr from the open ceramic surface.

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具有科斯纳拉特结构的 Sr0.5Zr2(PO4)3 磷酸盐在各种环境中的化学稳定性研究

摘要通过火花等离子烧结法获得了基于 Sr0.5Zr2(PO4)3 磷酸盐的陶瓷样品，该样品具有高斯纳石矿物（NaZr2(PO4)3，NZP）的结构。采用溶胶-凝胶法制备了粒径小于 1 μm 的亚微米级磷酸盐粉末。粉末和陶瓷具有单相 NZP 结构。陶瓷的相对密度为 97.6%。在 90°C 的蒸馏水和矿泉水以及酸性和碱性环境中，以静态模式研究了所获陶瓷的化学稳定性。所达到的最低浸出率为 ~10-4-10-6 克/（平方厘米-天）。研究了接触环境对 42 天内 Sr0.5Zr2(PO4)3 陶瓷样品中硒的沥滤速率和机制的影响。结果表明，在蒸馏水和矿泉水中测试（最多 7 天），硒的沥滤是由于陶瓷表层的溶解造成的；在矿泉水中测试 7 天后，硒从开放的陶瓷表面被冲洗掉。

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来源期刊

Radiochemistry CHEMISTRY, INORGANIC & NUCLEAR-

CiteScore

1.30

自引率

33.30%

发文量

期刊介绍： Radiochemistry is a journal that covers the theoretical and applied aspects of radiochemistry, including basic nuclear physical properties of radionuclides; chemistry of radioactive elements and their compounds; the occurrence and behavior of natural and artificial radionuclides in the environment; nuclear fuel cycle; radiochemical analysis methods and devices; production and isolation of radionuclides, synthesis of labeled compounds, new applications of radioactive tracers; radiochemical aspects of nuclear medicine; radiation chemistry and after-effects of nuclear transformations.