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Impedance spectroscopy of Na 0.5 Bi 4.50+x Ti 4 O y (x = ‐0.02, 0, 0.02) ceramics with excellent dielectric properties
Author(s) -
Du Yi Ke,
Qi Yi,
Liu Kang Hui,
Chen Ye,
Zuo Yuan Dong,
Qin Lu,
Jiang Chao Bin,
Chen Yong,
Shen Meng,
Xiang Huang Zhao
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.13735
Subject(s) - materials science , analytical chemistry (journal) , dielectric , dielectric spectroscopy , perovskite (structure) , bismuth , relative permittivity , permittivity , ceramic , electrical resistivity and conductivity , atmospheric temperature range , conductivity , dielectric loss , crystallography , composite material , electrode , metallurgy , chemistry , optoelectronics , thermodynamics , electrical engineering , electrochemistry , physics , chromatography , engineering
The electric and dielectric properties of Na 0.5 Bi 4.50+x Ti 4 O y (x = −0.02, 0, 0.02) prepared by conventional mixed oxide route have been investigated by impedance spectroscopy (IS) over a wide temperature range. Single‐phase bismuth layer‐structured perovskite patterns were observed through X‐ray diffraction of the three samples Na 0.5 Bi 4.5 Ti 4 O 15 , Na 0.5 Bi 4.48 Ti 4 O y , and Na 0.5 Bi 4.52 Ti 4 O y . The results show that the relative permittivity (εr) increases with the increase in temperature and reaches its maximum at about 675℃. With the continuous increase in temperature, the permittivity decreases gradually. Both relative permittivity and dielectric loss show great stability at the low‐temperature zone. The ceramic of x = 0.02 with Ea of 1.09 eV has the maximum oxygen ionic transport number between 600 and 800℃ for all samples. And at this time, it has the maximum electrical conductivity. All the results indicated that Na 0.5 Bi 4.50+x Ti 4 O y (x = −0.02, 0, 0.02) ceramics were promising base materials for high‐temperature capacitor because of their high dielectric properties.