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Enhanced Thermoelectric Performance of SmBaCuFeO 5+δ /Ag Composite Ceramics
Author(s) -
Zeng Chengcheng,
Butt Sajid,
Lin YuanHua,
Li Ming,
Nan CeWen
Publication year - 2016
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.14062
Subject(s) - materials science , ceramic , composite number , thermoelectric effect , thermal conductivity , crystallite , grain boundary , copper , composite material , electrical resistivity and conductivity , microstructure , grain size , mineralogy , metallurgy , thermodynamics , chemistry , physics , electrical engineering , engineering
Polycrystalline SmBaCuFeO 5+δ /Ag composite ceramics have been synthesized by a traditional ceramic processing method. Phase composition and microstructural analyses indicate that with the introduction of Ag additives, the second phases of copper oxides and Ag appear in these composite ceramic samples. The hole concentration and molibility can be enhanced greatly by the addition of Ag particles, which results in a large increase in the electrical conductivity. The thermal conductivity behaviors show that phonons can be scattered effectively by point defects and mesoscale grain boundaries, which remain a slight change in thermal conductivity. A maximum ZT value 0.047 has been achieved at 1023 K in the SmBaCuFeO 5+δ /20 vol% Ag composite ceramic, and is about 16 times than the pure SmBaCuFeO 5+δ sample. Our results reveal that Ag addition is an effective way to enhance the thermoelectric properties.