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A New Orthorhombic Ba8Co7O21 Phase: Polymorphism in the (Ba3Co2O6)α(Ba3Co3O9)β System

✍ Scribed by K. Boulahya; M. Parras; J.M. González-Calbet; A. Vegas

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
772 KB
Volume
151
Category
Article
ISSN
0022-4596

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✦ Synopsis

The systematic search of new intermediate phases between 2H-BaCoO 3 and Ca 3 Co 2 O 6 structures has shown, for the 5rst time, the existence of polymorphism in monodimensional phases of the homologous series (A 3 B 2 O 6 ) (A 3 B 3 O 9 ) . A new Ba 8 Co 7 O 21 phase, di4erent from the trigonal phase previously reported, has been synthesized. The new material is orthorhombic (SG Fd2d) with unit cell parameters a o ‫؍‬ 1.14, b o ‫؍‬ 1.98, and c o ‫؍‬ 1.75 nm. Both orthorhombic and trigonal phases are built up of isolated rows of polyhedra parallel to the c-axis formed by one trigonal prism and six ocathedra sharing faces, but with a di4erent spatial arrengement between the chains. The orthorhombic structure can be derived from a hcp stacking of Ba 8 O 24 and Ba 8 Co 2 O 18 layers.

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