Anomaly diffuse and dielectric relaxation in strontium doped lanthanum molybdate
Journal Article
·
· Materials Research Bulletin
- State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072 (China)
Highlights: Black-Right-Pointing-Pointer The anomaly diffuse and dielectric relaxation behaviors are fitted by the Cole-Cole approach. Black-Right-Pointing-Pointer The peak in the LSMO is corresponding to different oxygen ion diffusion process. Black-Right-Pointing-Pointer We first give better explanation about the strange conductivity change caused by doping. Black-Right-Pointing-Pointer The oxygen ion diffusion is due to a combination of the dipolar relaxation and the motion of ions. -- Abstract: The dielectric properties of the La{sub 2-x}Sr{sub x}Mo{sub 2}O{sub 9-{delta}} (x = 0-0.2) ceramics were investigated in the temperature range of 300-800 K. Dielectric measurement reveals that two dielectric anomalies, associated with the oxygen ion diffusion, exist in frequency spectrum with x = 0.5. The broad dielectric peaks in tan {delta}({omega}) can be well fitted by a modified Cole-Cole approach. When x = 0.1, only one dielectric relaxation peak is observed, corresponding to different oxygen ion diffusion processes, as distinct from the only relaxation peak in the pure La{sub 2}Mo{sub 2}O{sub 9}. The relaxation parameters {tau}{sub 0}, the dielectric relaxation strength {Delta}, and the activation energy E{sub a} were obtained. The result of this work shows that, the conductivity change caused by doping between the two phases is due to the combination of the dipolar effects and motion of ions.
- OSTI ID:
- 22212370
- Journal Information:
- Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 12 Vol. 46; ISSN MRBUAC; ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
Similar Records
Study on the electrical conductivity and oxygen diffusion of oxide-ion conductors La{sub 2}Mo{sub 2-x}T {sub x}O{sub 9-{delta}} (T = Al, Fe, Mn, Nb, V)
Effect of doping, microstructure, and CO{sub 2} on La{sub 2}NiO{sub 4+{delta}}-based oxygen-transporting materials
Using in situ X-ray absorption spectroscopy to study the local structure and oxygen ion conduction mechanism in (La{sub 0.6}Sr{sub 0.4})(Co{sub 0.2}Fe{sub 0.8})O{sub 3-{delta}}
Journal Article
·
Tue Jun 05 00:00:00 EDT 2007
· Materials Research Bulletin
·
OSTI ID:21000652
Effect of doping, microstructure, and CO{sub 2} on La{sub 2}NiO{sub 4+{delta}}-based oxygen-transporting materials
Journal Article
·
Wed Dec 14 23:00:00 EST 2011
· Journal of Solid State Chemistry
·
OSTI ID:21612833
Using in situ X-ray absorption spectroscopy to study the local structure and oxygen ion conduction mechanism in (La{sub 0.6}Sr{sub 0.4})(Co{sub 0.2}Fe{sub 0.8})O{sub 3-{delta}}
Journal Article
·
Wed Aug 15 00:00:00 EDT 2012
· Journal of Solid State Chemistry
·
OSTI ID:22131098