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钙钛矿衍生的BaSrYGaO（0≤≤3）材料中的氧离子电导率、质子电导率和相变

Oxide Ion Conductivity, Proton Conductivity, and Phase Transitions in Perovskite-Derived Ba Sr YGaO 0 ≤ ≤ 3 Materials.

作者信息

Fuller Chloe A, Murrell James Iain, Blom Douglas A, Vogt Thomas, Zhang Weiguo, Halasyamani P Shiv, Evans Ivana Radosavljevic, Evans John S O

机构信息

Department of Chemistry, Durham University, Science Site, South Road, Durham DH1 3LE, United Kingdom.

Department of Chemical Engineering and NanoCenter, University of South Carolina, Columbia, South Carolina 29208, United States.

出版信息

Chem Mater. 2022 Apr 12;34(7):3185-3196. doi: 10.1021/acs.chemmater.1c04372. Epub 2022 Mar 28.

DOI:10.1021/acs.chemmater.1c04372
PMID:35557987
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9086979/
Abstract

We report the synthesis, structural characterization, and oxide ion and proton conductivities of the perovskite-related Ba Sr YGaO family. Single-phase samples are prepared for 0 ≤ ≤ 3 and show a complex structural evolution from 2/ to 2 space groups with an increase in . For 1.0 ≲ ≲ 2.4, average structures determined by X-ray and neutron powder diffraction show metrically orthorhombic unit cells, but HAADF-STEM imaging reveals this is caused by microstructural effects due to intergrowths of the Ba- and Sr-rich structure types. Variable-temperature powder diffraction studies suggest that 0 ≲ ≲ 2.4 compositions undergo a phase transition upon being heated to space group that involves disordering of the oxygen substructure. Thermal expansion coefficients are reported for the series. Complex impedance studies show that the Ba-rich samples are mixed proton and oxide ion conductors under moist atmospheres but are predominantly oxide ion conductors at high temperatures or under dry atmospheres. Sr-rich samples show significantly less water uptake and appear to be predominantly oxide ion conductors under the conditions studied.

摘要

我们报道了钙钛矿相关的BaSrYGaO族的合成、结构表征以及氧离子和质子电导率。制备了0≤≤3的单相样品，随着的增加，样品呈现出从2/到2空间群的复杂结构演变。对于1.0≲≲2.4，通过X射线和中子粉末衍射确定的平均结构显示出度量正交晶胞，但高角度环形暗场扫描透射电子显微镜成像表明，这是由于富钡和富锶结构类型的共生导致的微观结构效应引起的。变温粉末衍射研究表明，0≲≲2.4的成分在加热到空间群时会发生相变，这涉及氧亚结构的无序化。报道了该系列的热膨胀系数。复阻抗研究表明，富钡样品在潮湿气氛下是质子和氧离子混合导体，但在高温或干燥气氛下主要是氧离子导体。富锶样品的吸水量明显较少，在所研究的条件下似乎主要是氧离子导体。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2f47/9086979/b3bd65d24923/cm1c04372_0009.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2f47/9086979/724f7ebbd099/cm1c04372_0001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2f47/9086979/649dd5746e66/cm1c04372_0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2f47/9086979/0b48c068832c/cm1c04372_0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2f47/9086979/029805cbc48c/cm1c04372_0004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2f47/9086979/ed25bae073bd/cm1c04372_0005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2f47/9086979/eda63cfc4103/cm1c04372_0006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2f47/9086979/230798e2b4b5/cm1c04372_0007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2f47/9086979/c44a8a5bdc09/cm1c04372_0008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2f47/9086979/b3bd65d24923/cm1c04372_0009.jpg

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