Premium
Influences of Bi 0.75 Y 0.25 O 1.5 addition on the microstructure and ionic conductivity of Ce 0.8 Y 0.2 O 1.9 ceramics
Author(s) -
Liang Wenke,
Meng Bin,
Xiao Qingfei,
Ping Xinyu,
Zheng Qian,
Li Chen,
Xia Zhidong
Publication year - 2021
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.13746
Subject(s) - materials science , sintering , phase (matter) , impurity , ceramic , grain size , microstructure , conductivity , grain boundary , analytical chemistry (journal) , mineralogy , composite material , physics , chemistry , environmental chemistry , quantum mechanics
A second phase of Y 2 O 3 ‐stabilized Bi 2 O 3 (Bi 0.75 Y 0.25 O 1.5 ,YSB) is introduced into Y 2 O 3 ‐doped CeO 2 (Ce 0.8 Y 0.2 O 1.9 ,YDC) as a sintering additive and the composite ceramics of YDC‐xYSB (x = 0, 5, 10, 20, 30, 40 wt%) are prepared through sintering at 1100°C for 6 h in air atmosphere. The YDC‐xYSB ceramics are composed of both YDC and YSB with cubic fluorite structure, and no other impurity phases are detected in XRD patterns. The relative density of YDC‐xYSB rises firstly for x ≤5 wt%, and then it declines with YSB addition from 5 to 40 wt%. The average grain size of YDC decreases from 270 nm to 85.7 nm with YSB addition from 0 to 40 wt%. The YSB phase segregates at the grain boundaries of YDC based on the TEM analysis result. The ionic conductivity of YDC‐xYSB (x ≥5 wt%) is lower than that of YDC in the test temperature of 200°C–500°C, while it gradually exceeds that of YDC in 500°C–750°C. At 750°C, the conductivity of YDC‐30%YSB (6.22 × 10 −2 S/cm) is 1.35 times higher than that of YDC (4.6 × 10 −2 S/cm). The YSB addition can improve the ionic conductivity of YDC in 500°C–750°C and decrease its sintering temperature.