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Crystal structure and ionic conductivity of Mg-doped apatite-type lanthanum silicates LaloSi6-xMgxO27-x (x= 0-0.4)
Lanthanum silicates LaloSi6 xMgxO27_x (x = 0-0.4) were prepared by solid state synthesis to investigate the effect of Mg doping on crystal structure and ionic conductivity. Rietveld analysis of the powder XRD patterns reveals that Mg substitution on Si site results in significant enlargement of chan...
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Published in: | 中国物理B:英文版 2014 (4), p.663-668 |
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Main Author: | |
Format: | Article |
Language: | English |
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Online Access: | Get full text |
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Summary: | Lanthanum silicates LaloSi6 xMgxO27_x (x = 0-0.4) were prepared by solid state synthesis to investigate the effect of Mg doping on crystal structure and ionic conductivity. Rietveld analysis of the powder XRD patterns reveals that Mg substitution on Si site results in significant enlargement of channel triangles, favoring oxide-ion conduction. Furthermore, an increase of Mg concentration significantly influences the linear density of interstitial oxygen, which plays an important role in ionic conductivity. The Arrhenius plots of LaloSi6_xMgxO27 x (x = 0-0.4) suggest that Mg-doped samples present higher conductivity and lower activation energy than non-doped La10Si6027, and LaloSis.8Mgo.2026.8 exhibits the highest conductivity with a value of 3.0× 10-2 S .cm 1 at 700 ℃. Such conductive behavior agrees well with the refined results. The corresponding mechanism has been discussed in this paper. |
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ISSN: | 1674-1056 2058-3834 |