NDLI: Electroconductivity and transport numbers of solid electrolytes La$_{10−x }$Ca$_{x}$A$_{6}$O$_{27−δ}$ and La$_{9.33+δ}$A$_{6−x }$Al$_{x}$O$_{26}$ (A = Si, Ge) with apatite-like structure

Content Provider	Springer Nature Link
Author	Gorshkov, M. Yu. Neuimin, A. D. Bogdavich, N. M. Bronin, D. I.
Copyright Year	2006
Abstract	The ion-oxygen conductivity of apatite-like compounds based on lanthanum silicates and germanates La$_{10}$A$_{6}$O$_{27}$ (A = Si, Ge), La$_{10−x }$Ca$_{x}$Si$_{6}$O$_{27−δ}$ (x = 0.25, 0.5, 1.0), La$_{9.75}$Ca$_{0.25}$Ge$_{6}$O$_{27−δ}$ and La$_{9.33+δ}$Si$_{6−x }$Al$_{x}$O$_{26}$(x=0.4, 0.8, 1.5) is studied in the interval of partial oxygen pressures pO$_{2}$ extending from 10$^{−16}$ to 10$^{5}$ Pa, at temperatures of 500–1000°C. The electroconductivity of undoped compounds La$_{10}$A$_{6}$O$_{27}$ (A = Si, Ge) exceeds that of yttria-stabilized zirconia. The electroconductivity of lanthanum germanate (1.7 × 10$^{−2}$ and 8.5 × 10$^{−2}$S cm$^{−1}$ at 700 and 900°C, respectively) is substantially higher than that of lanthanum silicate (9.8 × 10$^{−3}$ and 3.5 × 10$^{−2}$ S cm$^{−1}$ at 700 and 900°C). Doping lanthanum germanate with calcium raises its electroconductivity (2.7 × 10$^{−2}$ and 1.3 × 10$^{−1}$ S cm$^{−1}$ for La$_{9.75}$Ca$_{0.25}$Ge$_{6}$O$_{27−δ}$ at 700 and 900°C). Conversely, doping lanthanum silicate with ions of calcium or aluminum reduces the conductivity. In the pO$_{2}$ interval studied, the above compounds are ionic conductors and represent a class of solid electrolytes of promise for various electrochemical devices.
Starting Page	737
Ending Page	743
Page Count	7
File Format	PDF
ISSN	10231935
Journal	Russian Journal of Electrochemistry
Volume Number	42
Issue Number	7
e-ISSN	16083342
Language	English
Publisher	Nauka/Interperiodica
Publisher Date	2006-01-01
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	apatites ion-oxygen solid electrolytes lanthanum silicates lanthanum germanates electroconductivity transport numbers for ions Physical Chemistry Electrochemistry
Content Type	Text
Resource Type	Article
Subject	Electrochemistry

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