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Electrical conductivity and thermal expansion of the oxy-cuspidine Gd4Al2O9 substituted with Ca and Sr by O.H. Hassan; F. Tietz; D. Stöver is a Materials Science article available to read on EtoBox.
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The series of Gd 4 -x M x Al 2 O 9 -x/2 (M = Ca, Sr) with x = 0, 0.01, 0.05, 0.10 and 0.25 was prepared by the citrate complexation method. Both Gd 4 -x Ca x Al 2 O 9 -x/2 and Gd 4 -x Sr x Al 2 O 9 -x/2 show the monoclinic cuspidine structure with space group of P2 1 /c up to 0.05-0.1 and 0.01-0.05 mol for Ca and Sr, respectively. Beyond the substitution limit of Gd 4 Al 2 O 9 , GdAlO 3 and SrGd 2 Al 2 O 7 appear as additional phases. The highest electrical conductivity obtained at 900 °C yielded σ = 1.49 ×10 -4 S/cm for Gd 3.95 Ca 0.05 Al 2 O 8.98 . In comparison, the conductivity of pure Gd 4 Al 2 O 9 was σ = 1.73 × 10 -5 S/cm. The conductivities determined are in a similar range as those of other cuspidine materials investigated previously. The thermal expansion coefficient of Gd 4 Al 2 O 9 at 1000 °C was 7.4 × 10 -6 K -1 . The phase transition between 1100 and 1200 °C reported earlier changes with increasing substitution of Ca and Sr.
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It is typically read by researchers, students, and practitioners in Materials Science.
- Author
- O.H. Hassan; F. Tietz; D. Stöver
- Publisher
- Elsevier Science; Elsevier ; Elsevier BV (ISSN 0167-2738)
- Published
- 2009
- Language
- EN
- Field
- Materials Science (Physical Sciences)