Proton conductivity of Ca-doped Ba2R1-xCaxNbO6-δ (R = La, Nd, Sm, Gd, Dy, Y, and Yb) ceramics with double perovskite structure

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society Pub Date : 2024-10-16 DOI:10.1016/j.jeurceramsoc.2024.116989

Akinori Kan , Yuta Niwa , Susumu Takahashi , Hirotaka Ogawa

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引用次数: 0

Abstract

The influence of Ca substitution for R (R = La, Nd, Sm, Gd, Dy, Y, and Yb) on the electrical conductivity of double perovskite-structured Ba₂R_1-xCa_xNbO_6-δ (x = 0 and 0.2) ceramics was characterized in this study. Crystal structure analysis of Ba₂R_0.8Ca_0.2NbO_6-δ showed three types of lattices, monoclinic (R= La and Nd), tetragonal (R= Sm, Gd, and Dy) and cubic (R= Y and Yb), resulting the reduction of structural distortion for monoclinic structure by the Ca substitution for R. The significant differences in the electrical conductivity between the Ba₂LaNbO₆ and Ba₂La_0.8Ca_0.2NbO_6-δ ceramics may be related to the decrease in the structural distortion, as suggested by the changes in HT-XRPD patterns. Ba₂La_0.8Ca_0.2NbO₆ ceramic exhibited the highest electrical conductivity of 2.21 × 10⁻³ S/cm at 800 ℃ measured under a wet 1 % H₂/Ar atmosphere. EMF measurements using a hydrogen concentration cell with water vapor and a water vapor concentration cell revealed that the predominant charge carriers in the Ba₂R_1-xCa_xNbO_6-δ ceramics were protons in the temperature range of 600–800 ℃.

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具有双包晶石结构的掺 Ca Ba2R1-xCaxNbO6-δ（R = La、Nd、Sm、Gd、Dy、Y 和 Yb）陶瓷的质子电导率

本研究表征了 Ca 取代 R（R = La、Nd、Sm、Gd、Dy、Y 和 Yb）对双包晶结构 Ba2R1-xCaxNbO6-δ （x = 0 和 0.2）陶瓷导电性的影响。Ba2R0.8Ca0.2NbO6-δ 的晶体结构分析显示出三种晶格类型，即单斜（R= La 和 Nd）、四方（R= Sm、Gd 和 Dy）和立方（R= Y 和 Yb）。从 HT-XRPD 图样的变化来看，Ba2LaNbO6 和 Ba2La0.8Ca0.2NbO6-δ 陶瓷之间在导电性上的显著差异可能与结构畸变的减小有关。Ba2La0.8Ca0.2NbO6 陶瓷在 800 ℃ 的湿 1 % H2/Ar 气氛下测得的导电率最高，为 2.21 × 10-3 S/cm。使用含水蒸气的氢气浓缩池和水蒸气浓缩池进行的电磁场测量显示，在 600-800 ℃ 的温度范围内，Ba2R1-xCaxNbO6-δ 陶瓷中的主要电荷载流子是质子。

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

Journal of The European Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

10.70

自引率

12.30%

发文量

863

审稿时长

35 days

期刊介绍： The Journal of the European Ceramic Society publishes the results of original research and reviews relating to ceramic materials. Papers of either an experimental or theoretical character will be welcomed on a fully international basis. The emphasis is on novel generic science concerning the relationships between processing, microstructure and properties of polycrystalline ceramics consolidated at high temperature. Papers may relate to any of the conventional categories of ceramic: structural, functional, traditional or composite. The central objective is to sustain a high standard of research quality by means of appropriate reviewing procedures.