Synthesis and characterization of the RE2A2O7 oxides with an ultrahigh-entropy sublattice occupied by rare-earth elements

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Letters Pub Date : 2024-11-05 DOI:10.1016/j.matlet.2024.137668

Evgeny Trofimov , Ahmad Ostovari Moghaddam , Ksenia Litvinyuk , Mariappan Anandkumar , Milena Efimova , Dmitry Mikhailov , Olga Zaitseva

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Abstract

The possibility of fabricating novel high-entropy oxides (HEOs) with one ultrahigh-entropy sublattice consisting of 13 cations in RE₂A₂O₇ (RE = [La, Sm, Nd, Gd, Dy, Yb, Y, Er, Eu, Tb, Ho, Lu, Tm], A = Zr, Hf, Ti, Sn, Ce or Pr) is demonstrated. All the samples exhibited a pure pyrochlore-type or defective fluorite crystalline structure with various degrees of cation disordering. Particularly, RE₂Ti₂O₇ and RE₂Sn₂O₇ exhibited a pure pyrochlore-type structure with high degree of ordering, while RE₂Ce₂O₇ and RE₂Pr₂O₇ demonstrated a single fluorite type HEO structure. The results pave the way to fabricate RE₂A₂O₇ HEOs with an ultrahigh-entropy sublattice and potential application as the ceramic layer in thermal barrier coatings.

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具有被稀土元素占据的超高熵子晶格的 RE2A2O7 氧化物的合成与表征

研究证明了在 RE2A2O7（RE = [La、Sm、Nd、Gd、Dy、Yb、Y、Er、Eu、Tb、Ho、Lu、Tm]，A = Zr、Hf、Ti、Sn、Ce 或 Pr）中制造具有一个由 13 个阳离子组成的超高熵子晶格的新型高熵氧化物（HEO）的可能性。所有样品都呈现出不同程度的阳离子无序化的纯热长石型或缺陷萤石晶体结构。特别是，RE2Ti2O7 和 RE2Sn2O7 表现出具有高度有序性的纯热绿石型结构，而 RE2Ce2O7 和 RE2Pr2O7 则表现出单一萤石型 HEO 结构。这些结果为制备具有超高熵亚晶格的 RE2A2O7 HEO 铺平了道路，并有望将其用作热障涂层中的陶瓷层。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials Letters 工程技术-材料科学：综合

CiteScore

5.60

自引率

3.30%

发文量

1948

审稿时长

50 days

期刊介绍： Materials Letters has an open access mirror journal Materials Letters: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Materials Letters is dedicated to publishing novel, cutting edge reports of broad interest to the materials community. The journal provides a forum for materials scientists and engineers, physicists, and chemists to rapidly communicate on the most important topics in the field of materials. Contributions include, but are not limited to, a variety of topics such as: • Materials - Metals and alloys, amorphous solids, ceramics, composites, polymers, semiconductors • Applications - Structural, opto-electronic, magnetic, medical, MEMS, sensors, smart • Characterization - Analytical, microscopy, scanning probes, nanoscopic, optical, electrical, magnetic, acoustic, spectroscopic, diffraction • Novel Materials - Micro and nanostructures (nanowires, nanotubes, nanoparticles), nanocomposites, thin films, superlattices, quantum dots. • Processing - Crystal growth, thin film processing, sol-gel processing, mechanical processing, assembly, nanocrystalline processing. • Properties - Mechanical, magnetic, optical, electrical, ferroelectric, thermal, interfacial, transport, thermodynamic • Synthesis - Quenching, solid state, solidification, solution synthesis, vapor deposition, high pressure, explosive