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Evaluation of TiTe2 as a Diffusion Barrier in the Synthesis of (Bi2Te3)5(SnTe)5 Misfit Layer Compound

Published online by Cambridge University Press:  01 February 2011

Sissi L. Li
Affiliation:
sli@uoregon.edu, University of Oregon, Chemistry, 1253 University of Oregon, Eugene, OR, 97403, United States, 5419143253
David C. Johnson
Affiliation:
davej@uoregon.edu, University of Oregon, Chemistry, United States
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Abstract

The evolution of modulated reactants designed to form (Bi2Te3)5(TiTe2)5(SnTe)5(TiTe2)5 and (Bi2Te3)5(SnTe)5 are compared and contrasted. The modulated reactant designed to form (Bi2Te3)5(SnTe)5 interdiffused at 220°C forming SnBi2Te4 rather than the desired superlattice structure. The second sample was designed to have TiTe2 as a potential diffusion barrier to prevent the formation of SnBi2Te4. This second sample remained layered after annealing at 220°C. SnTe crystals are observed in the high angle diffraction pattern after this annealing, but there is evidence for the beginning of SnBi2Te4 formation. Annealing this sample at 300°C results in the formation of SnBi2Te4. The interdiffusion of Sn and Bi appears to occur before the formation of the desired TiTe2 structure.

Type
Research Article
Copyright
Copyright © Materials Research Society 2006

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References

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