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Synthesis and Electrical Conductivity of La1−xSrxAl0.9Mg0.1O3−δ(x = 0.1–0.4) Perovskite Solid Solution
| Content Provider | Scilit |
|---|---|
| Author | Shinomiya, A. Hirata, Y. Sameshima, S. Matsunaga, N. |
| Copyright Year | 2011 |
| Description | Journal: Iop Conference Series: Materials Science and Engineering Perovskite solid solution powders of $(La_{1−x}Sr_{x})(Al_{0.9}Mg_{0.1})O_{3−δ}$ (x = 0.1−0.4) were prepared by a coprecipitation method using corresponding aqueous solutions and ammonium carbonate solution. The X-ray diffraction patterns for the compositions of x = 0.1−0.4 were identified as those of hexagonal $LaAlO_{3}$ solid solutions. The bulk conductivity of $(La_{0.6}Sr_{0.4}$) $(Al_{0.9}Mg_{0.1})O_{3−δ}$ by AC method at 1 V was independent of the oxygen partial pressure and 2.33 $×10^{−3}$ $Scm^{−1}$ at 800°C, suggesting the oxide ion conduction. The activation energy of bulk conductivity was 111 $kJmol^{−1}$ at 300–500 °C. The grain boundary conductivity increased from $2.02×10^{−6}$ $Scm^{−1}$ at $Po_{2}$ = $10^{−15}$ Pa to $1.11×10^{−5}$ $Scm^{−1}$ at $Po_{2}$ = $2.1×10^{4}$ Pa at 800 °C. Hole conduction contributed to the increased conductivity. DC conductivity of $(La_{0.6}Sr_{0.4})(Al_{0.9}Mg_{0.1})O_{3−δ}$ depended on the applied voltage and temperature. In $N_{2}$ atmosphere, hole conductivity overlapped oxide ion conductivity at a high applied voltage (E > 1 V) because of the chemical reaction between positively charged oxide vacancy and $N_{2}$ gas $(Vo^{}$ + $N_{2}$ → $2N_{o}$' + $4h^{}$). |
| Related Links | http://iopscience.iop.org/article/10.1088/1757-899X/18/13/132015/pdf |
| ISSN | 17578981 |
| e-ISSN | 1757899X |
| DOI | 10.1088/1757-899x/18/13/132015 |
| Journal | Iop Conference Series: Materials Science and Engineering |
| Issue Number | 13 |
| Volume Number | 18 |
| Language | English |
| Publisher | IOP Publishing |
| Publisher Date | 2011-03-12 |
| Access Restriction | Open |
| Subject Keyword | Journal: Iop Conference Series: Materials Science and Engineering Grain Boundary Electric Conductivity Solid Solution Chemical Reaction Activation Energy Aqueous Solution |
| Content Type | Text |
| Resource Type | Article |
