Different [Bi12O14]n Columnar Structural Types in the Bi–Mo–Cr–O System: Synthesis, Structure, and Electrical Properties of the Solid Solution Bi26Mo10−xCrxO69
✍ Scribed by P. Bégué; J.M. Rojo; J.E. Iglesias; A. Castro
- Publisher
- Elsevier Science
- Year
- 2002
- Tongue
- English
- Weight
- 333 KB
- Volume
- 166
- Category
- Article
- ISSN
- 0022-4596
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✦ Synopsis
In order to search for new ionic conductor materials exhibiting a columnar [Bi 12 O 14 ] structural type, the syntheses of the solid solutions Bi 2 Mo 1؊x Cr x O 6 and Bi 26 Mo 10؊x Cr x O 69 have been undertaken. Single phases were obtained for the last composition with 04x45 homogeneity range. Moreover, a new oxide with Bi 6 Cr 2 O 15 composition has been obtained from the limit nominal stoichiometries Bi 2 CrO 6 and Bi 26 Cr 10 O 69 . X-ray powder di4raction studies have shown that this oxide crystallizes in the orthorhombic system, space group Ccc2 or Cccm, with unit-cell parameters a ؍ 19.8986(9) A s , b ؍ 12.2756(6) A s , c ؍ 5.8868(3) A s , and V ؍ 1437.96 A s 3 . Impedance spectroscopy measurements carried out on the representative Bi 26 Mo 8 Cr 2 O 69 phase, showed that this material is a good oxygen ion conductor, in fact the best one belongs to the columnar structural type, with a conductivity as high as 1.7؋10 ؊ 3 S cm ؊ 1 at 425 3C.