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Phase transformation in the system TlBi(Te1-xSex)(2)

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Chrissaris, K.
Vinga, E. S.
Özer, Mehmet
Paraskevopoullos, K. M.
Polychroniadis, E. K.

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TlBiTe2 and TlBiSe2 -that are ternary analogs of the IV-VI semiconductors-, although they crystallize in the same space group R (3) over barm (D-3d(5)), exhibit different behaviour during heating. The observed phase transformation depends on Se content (x) in the system TIBi(Te1-xSex)(2) and the transformation disappears by increasing Se content after a certain value (x=0.25). This dependence is examined through the analysis of the DSC non-isothermal measurements and an attempt for the explanation of the observed behaviour is undertaken through the consideration of off - center atoms. (C) 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

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