Investigation on electrical performance of Sr, Mg, co-doped Na<sub>0.5</sub>Bi<sub>0.5</sub>TiO<sub>3</sub> oxide ion conductor

Investigation on electrical performance of Sr, Mg, co-doped Na<sub>0.5</sub>Bi<sub>0.5</sub>TiO<sub>3</sub> oxide ion conductor

Na<sub>0.5</sub>Bi<sub>0.48</sub>Sr<sub>0.02</sub>Ti<sub>0.98</sub>Mg<sub>0.02</sub>O<sub>2.97</sub> compound was synthesized by solid-state reaction. AC impedance and internal friction spectroscopy were employed to study the el...

Full description

Bibliographic Details
Main Authors: WANG Wei-guo, WANG Xin-fu, WANG Dan, HAO Gang-ling
Format: Article
Language:zho
Published: Journal of Materials Engineering 2019-08-01
Series:Cailiao gongcheng
Subjects:
oxide ionic conductor
grain conductivity
oxygen vacancy mobility
Online Access:http://jme.biam.ac.cn/CN/Y2019/V47/I8/28
Description
Summary:Na<sub>0.5</sub>Bi<sub>0.48</sub>Sr<sub>0.02</sub>Ti<sub>0.98</sub>Mg<sub>0.02</sub>O<sub>2.97</sub> compound was synthesized by solid-state reaction. AC impedance and internal friction spectroscopy were employed to study the electrical performance and oxgyen ion diffusion in the Sr,Mg-co-doped Na<sub>0.5</sub>Bi<sub>0.5</sub>TiO<sub>3</sub> compounds. The grain conductivity of Na<sub>0.5</sub>Bi<sub>0.48</sub>Sr<sub>0.02</sub>Ti<sub>0.98</sub>Mg<sub>0.02</sub>O<sub>2.97</sub> sample can reach 5.31&#215;10<sup>-4</sup> S/cm at 593 K, an order of magnitude higher than that of the Na<sub>0.5</sub>Bi<sub>0.5</sub>TiO<sub>3</sub> compound at the same temperature and exceeding the grain conductivity of Na<sub>0.5</sub>Bi<sub>0.5</sub>Ti<sub>0.98</sub>Mg<sub>0.02</sub>O<sub>2.98</sub> sample at 673K. An internal friction relaxation peak was observed. The relaxation parameters can be calculated, <i>E</i>=0.85eV and <i>τ</i><sub>0</sub>=7.4&#215;10<sup>-14</sup>s. Judging from the relaxation parameters and structural analysis, the Sr<sup>2+</sup> dopant can amplify the specific free volume. Compared with the Na<sub>0.5</sub>Bi<sub>0.5</sub>Ti<sub>0.98</sub>Mg<sub>0.02</sub>O<sub>2.98</sub> sample, the substantial increase of the grain conductivity for Na<sub>0.5</sub>Bi<sub>0.48</sub>Sr<sub>0.02</sub>Ti<sub>0.98</sub>Mg<sub>0.02</sub>O<sub>2.97</sub> sample may be derived from the larger specific free volume, higher mobile oxygen vacancy content and better oxygen vacancy mobility.
ISSN:1001-4381
1001-4381

Similar Items