Study defects formation mechanism in La1-xBaxMnO3 perovskite manganite by positron annihilation lifetime and Doppler broadening spectroscopy

IF 3 4区材料科学 Q3 CHEMISTRY, PHYSICAL Solid State Ionics Pub Date : 2024-07-03 DOI:10.1016/j.ssi.2024.116640

S.H. Jabarov , A.Kh. Nabiyeva , S.F. Samadov , A.S. Abiyev , A.A. Sidorin , N.V.M. Trung , O.S. Orlov , B. Mauyey , S.V. Trukhanov , A.V. Trukhanov , M.N. Mirzayev

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Abstract

In this study, La_1-xBa_xMnO₃ (x = 0.03, 0.27, 0.5) solid solutions were synthesized, and their structure and defect incorporation processes were investigated. The investigations were conducted using XRD, Positron Annihilation Lifetime, and Doppler Broadening Spectroscopy methods. Depending on the La/Ba ratio, the mechanism of defect incorporation in these compounds was studied, and vacancies of La and Ba atoms in the structure were determined. Three lifetime components are observed in PALS investigations. An increase in x results in a decrease in all three lifetime components. The results indicate that an increase in x leads to the formation of 0D (anion and cation point vacancies) and 3D (lattice distortions and interplanar distances) defects in the structure. Doppler Broadening results reveal a decrease in open volume defects and the presence of cationic defects.

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利用正电子湮灭寿命和多普勒展宽光谱研究 La1-xBaxMnO3 包晶锰酸盐中的缺陷形成机制

本研究合成了 La1-xBaxMnO3 (x = 0.03, 0.27, 0.5) 固溶体，并对其结构和缺陷掺入过程进行了研究。研究采用了 XRD、正电子湮没寿命和多普勒展宽光谱法。根据 La/Ba 的比例，研究了这些化合物的缺陷掺入机制，并确定了结构中 La 和 Ba 原子的空位。在 PALS 研究中观察到三种寿命成分。x 的增加导致所有三个寿命分量的减少。结果表明，x 的增加会导致结构中形成 0D（阴离子和阳离子点空位）和 3D （晶格畸变和平面间距）缺陷。多普勒展宽结果显示开放体积缺陷减少，阳离子缺陷存在。

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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.