Lattice distortion and strain induced crack formation in Y-doped BaZrO3

IF 3 4区材料科学 Q3 CHEMISTRY, PHYSICAL

Solid State Ionics Pub Date : 2024-09-04 DOI:10.1016/j.ssi.2024.116681

Jiachen Lu , Haobo Li , Zihan Zhao , Jixin Wu , Xueyan Wu , Qianli Chen

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引用次数: 0

Abstract

Proton conducting ceramics are promising solid electrolytes for protonic ceramic fuel cells. However, the presence of cracks remains a challenge before successful commercialization of the proton ceramic devices. This study investigates the impact of internal strain and lattice distortion on the crack formation in BaZr_0.8Y_0.2O_3-δ. During sintering, pellets are covered with controlled amount of sacrificial powder 2 or 3 times of the pellet mass, and the effects of adding BaCO₃ in the sacrificial powder is studied. The pellets sintered with 2 times sacrificial powder remain intact when dried, yet 53 % show cracks after hydration in 0.03 atm water vapor pressure. All pellets fracture into pieces when sintered with additional BaCO₃ in sacrificial powder, in which 0.07 mol% excessive Ba is observed in the actual composition. These Ba excess pellets show larger lattice constant compared to those prepared under other conditions. Strain analysis indicates that 0.14 % to 0.15 % micro strain is observed in the batches with cracks. Raman spectra reveal higher degree of lattice distortion in the BO₆ octahedra in the cracked batches. The findings highlight the role of lattice distortion in internal strain, and crack formation. This work may contribute to the processing of solid electrolytes in protonic ceramic fuel cells.

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掺 Y 的 BaZrO3 中的晶格畸变和应变诱导的裂纹形成

质子传导陶瓷是质子陶瓷燃料电池的理想固体电解质。然而，裂纹的存在仍然是质子陶瓷器件成功商业化之前的一项挑战。本研究探讨了内部应变和晶格畸变对 BaZr0.8Y0.2O3-δ 中裂纹形成的影响。在烧结过程中，球团表面覆盖了控制量的牺牲粉，牺牲粉的量为球团质量的 2 或 3 倍，并研究了在牺牲粉中添加 BaCO3 的影响。使用 2 倍牺牲粉烧结的球团在干燥时保持完好，但在 0.03 atm 的水蒸气压力下水化后，53% 的球团出现裂缝。当在牺牲粉中加入额外的 BaCO3 烧结时，所有的颗粒都会碎裂成碎片，其中在实际成分中观察到 0.07 摩尔%的过量钡。与在其他条件下制备的颗粒相比，这些过量钡的颗粒显示出更大的晶格常数。应变分析表明，在有裂纹的批次中观察到 0.14 % 至 0.15 % 的微应变。拉曼光谱显示，在有裂纹的批次中，BO6 八面体的晶格畸变程度较高。这些发现凸显了晶格畸变在内部应变和裂纹形成中的作用。这项工作可能有助于质子陶瓷燃料电池中固体电解质的加工。

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

Solid State Ionics 物理-物理：凝聚态物理

CiteScore

6.10

自引率

3.10%

发文量

152

审稿时长

58 days

期刊介绍： This interdisciplinary journal is devoted to the physics, chemistry and materials science of diffusion, mass transport, and reactivity of solids. The major part of each issue is devoted to articles on: (i) physics and chemistry of defects in solids; (ii) reactions in and on solids, e.g. intercalation, corrosion, oxidation, sintering; (iii) ion transport measurements, mechanisms and theory; (iv) solid state electrochemistry; (v) ionically-electronically mixed conducting solids. Related technological applications are also included, provided their characteristics are interpreted in terms of the basic solid state properties. Review papers and relevant symposium proceedings are welcome.