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The coexisting cubic - rhombohedral phase Ge ( 3 ) Sb ( 2 ) Te ( 6 ) NWs exhibited an exclusively uniform superlattice structure consisting of 2 . 2 nm period slabs .
 Chemical: Ge ( 3 ) Sb ( 2 ) Te ( 6 )
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Answer:
 Chemical: Ge ( 3 ) Sb ( 2 ) Te ( 6 )