Multicomponent solid solution with pyrochlore structure

IF 2.7 4区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Boletin de la Sociedad Espanola de Ceramica y Vidrio Pub Date : 2023-11-01 DOI:10.1016/j.bsecv.2023.01.005

Branko Matović , Jelena Maletaškić , Vesna Maksimović , Stevan P. Dimitrijević , Bratislav Todorović , Milan Pejić , Dejan Zagorac , Jelena Zagorac , Yu-Ping Zeng , Ivana Cvijović-Alagić

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引用次数: 0

Abstract

Multicomponent oxide with pyrochlore structure (A₂B₂O₇), containing 7 different A-site cations and 3 B-site cations in equiatomic amounts, was synthesized. Powders with nominal composition (La_1/7Sm_1/7Nd_1/7Pr_1/7Y_1/7Gd_1/7Yb_1/7)₂(Sn_1/3Hf_1/3Zr_1/3)₂O₇ were fabricated through a reaction of metal nitrates (A-site) and metal chlorides (B-site) with sodium hydroxide during the solid state displacement reaction. Room temperature synthesis initially resulted in the obtainment of amorphous powders, which crystallized after subsequent calcination to form single crystalline compounds. Crystalline high-entropy ceramic powders formation took place at temperatures as low as 750 °C. During calcination, defective fluorite (F-A₂B₂O₇) and crystal pyrochlore (Py-A₂B₂O₇) structures coexist. A large number of cations induce the obtainment of stable high-entropy pyrochlores. Results showed that sintering at 1650 °C lead to pure crystalline single-phase pyrochlore formation. High-density ceramic, free of additives, was obtained after powders were compacted and subjected to pressureless sintering at 1650 °C. Multicomponent pyrochlore structure was investigated using the theoretical and experimental multi-methodological approach.

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具有火成岩结构的多组分固溶体

合成了具有热绿结构（A2B2O7）的多组分氧化物，其中含有等原子量的 7 种不同的 A 位阳离子和 3 种 B 位阳离子。在固态置换反应中，金属硝酸盐（A 位）和金属氯化物（B 位）与氢氧化钠发生反应，生成了标称成分为 (La1/7Sm1/7Nd1/7Pr1/7Y1/7Gd1/7Yb1/7)2(Sn1/3Hf1/3Zr1/3)2O7 的粉末。室温合成最初得到的是无定形粉末，随后经过煅烧结晶成单晶化合物。结晶高熵陶瓷粉末的形成温度低至 750 ℃。在煅烧过程中，缺陷萤石（F-A2B2O7）和晶体焦绿泥石（Py-A2B2O7）结构共存。大量阳离子促使获得稳定的高熵焦绿宝石。结果表明，在 1650 °C 下烧结可形成纯结晶单相火绿宝石。将粉末压实并在 1650 ℃ 下进行无压烧结后，得到了不含添加剂的高密度陶瓷。采用理论和实验相结合的方法研究了多组分火成岩结构。

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来源期刊

Boletin de la Sociedad Espanola de Ceramica y Vidrio 工程技术-材料科学：硅酸盐

CiteScore

5.50

自引率

2.90%

发文量

审稿时长

103 days

期刊介绍： The Journal of the Spanish Ceramic and Glass Society publishes scientific articles and communications describing original research and reviews relating to ceramic materials and glasses. The main interests are on novel generic science and technology establishing the relationships between synthesis, processing microstructure and properties of materials. Papers may deal with ceramics and glasses included in any of the conventional categories: structural, functional, traditional, composites and cultural heritage. The main objective of the Journal of the Spanish Ceramic and Glass Society is to sustain a high standard research quality by means of appropriate reviewing procedures.