Non-Arrhenius grain growth in SrTiO3: Impact on grain boundary conductivity and segregation

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Acta Materialia Pub Date : 2024-11-10 DOI:10.1016/j.actamat.2024.120560

M. Pascal Zahler, Dylan Jennings, Olivier Guillon, Wolfgang Rheinheimer

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Abstract

In this study, a correlation between the conductivity, space charge layers, solute drag and non-Arrhenius grain growth in SrTiO₃ was investigated. Strontium titante is known for its non-Arrhenius grain growth where grain growth rates decrease by orders of magnitude with increasing temperatures between 1350°C and 1425°C. Here, undoped SrTiO₃ was sintered and annealed at temperatures below and above the grain growth transition. The influence of the annealing temperature and time on the conductivity and space charge layers at grain boundaries (GBs) in SrTiO₃ was investigated by electrochemical impedance spectroscopy (EIS). STEM-EDS analysis indicates the presence of GBs with qualitative different cationic segregation in SrTiO₃. A distortion of the GB semi-circle in the impedance plots was found which was attributed to the presence of multiple GB types with different electric properties and space charge layers. The presence of two GB types as indicated by impedance analysis corresponds well with previous results, where solute drag and segregation was supposed to cause the non-Arrhenius grain growth behavior of SrTiO₃.

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SrTiO3 中的非阿伦尼乌斯晶粒生长：对晶界传导性和偏析的影响

本研究调查了氧化锶中的电导率、空间电荷层、溶质阻力和非阿伦尼斯晶粒生长之间的相关性。钛酸锶以其非阿伦尼斯晶粒生长而闻名，在 1350°C 至 1425°C 之间，随着温度的升高，晶粒生长率会以数量级的方式降低。在这里，未掺杂的 SrTiO3 在低于和高于晶粒生长转变的温度下进行烧结和退火。通过电化学阻抗光谱（EIS）研究了退火温度和时间对 SrTiO3 的电导率和晶界（GB）空间电荷层的影响。STEM-EDS 分析表明，SrTiO3 中存在定性不同的阳离子偏析晶界。阻抗图中的 GB 半圆出现扭曲，这是因为存在多种具有不同电特性和空间电荷层的 GB 类型。阻抗分析表明存在两种 GB 类型，这与之前的研究结果非常吻合，在之前的研究中，溶质拖曳和偏析被认为是导致 SrTiO3 非阿伦尼乌斯晶粒生长行为的原因。

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来源期刊

Acta Materialia 工程技术-材料科学：综合

CiteScore

16.10

自引率

8.50%

发文量

801

审稿时长

53 days

期刊介绍： Acta Materialia serves as a platform for publishing full-length, original papers and commissioned overviews that contribute to a profound understanding of the correlation between the processing, structure, and properties of inorganic materials. The journal seeks papers with high impact potential or those that significantly propel the field forward. The scope includes the atomic and molecular arrangements, chemical and electronic structures, and microstructure of materials, focusing on their mechanical or functional behavior across all length scales, including nanostructures.