高掺杂高熵A2B2O7焦绿石

IF 0.9 4区材料科学 Q3 MATERIALS SCIENCE, CERAMICS

Processing and Application of Ceramics Pub Date : 2023-01-01 DOI:10.2298/pac2302113m

B. Matović, J. Maletaskic, V. Maksimović, J. Zagorac, Aleksandar Luković, Yuping Zeng, I. Cvijović-Alagić

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引用次数: 0

摘要

成功地合成了一类具有A位和B位多元素的新型高熵焦绿盐化合物(A2B2O7)。在固态置换反应(SSDR)中，以金属硝酸盐(位a)和金属氯化物(位B)与氢氧化钠反应得到的纯金属氧化物为原料，制备了名义成分为(La1/7Sm1/7Nd1/7Pr1/7Y1/7Gd1/7Yb1/7)2(Sn1/3Hf1/3Zr1/3)2O7粉体。用XRD分析了相演化过程。在对十种金属氧化物进行热处理的过程中，形成了单一的焦绿石相。结果表明，在1650℃无压烧结4 h后，成功获得了硬度为8.1GPa的高密度(98%TD)陶瓷。Raman研究和Rietveld结构细化结果表明，烧结后的高熵陶瓷具有单相焦绿石结构，并对其进行了详细研究。

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Heavily doped high-entropy A2B2O7 pyrochlore

A novel class of high-entropy pyrochlore compounds with multiple elements at the A and B site positions (A2B2O7) was successfully obtained. Powders with (La1/7Sm1/7Nd1/7Pr1/7Y1/7Gd1/7Yb1/7)2(Sn1/3Hf1/3Zr1/3)2O7 nominal composition were fabricated from pure metal oxides obtained through a reaction of metal nitrates (for site A) and metal chlorides (for site B) with sodium hydroxide during the solid-state displacement reaction (SSDR). The phase evolution was analyzed using XRD method. During the thermal treatment of ten individual metal oxides, the single pyrochlore phase was created. The present study showed that the highdensity (98%TD) ceramics with a hardness of 8.1GPa was successfully obtained after pressureless sintering at 1650 ?C for 4 h. Results of the Raman study and the Rietveld structural refinement showed that sintered highentropy ceramics is characterized by a single-phase pyrochlore structure, which was investigated in detail.

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来源期刊

Processing and Application of Ceramics MATERIALS SCIENCE, CERAMICS-

CiteScore

1.90

自引率

9.10%

发文量

审稿时长

10 weeks

期刊介绍： Information not localized