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مجله مواد الکترونیکی 2013
جزئیات رویداد
همایش ، رویداد ، ژورنال
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  • thermal instability of β-zn4sb3: insights from transport and structural measurements

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
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      β-zn4sb3 exhibits poor thermal stability, with zinc-rich specimens recently shown to be more stable. in this work, temperature-dependent transport measurements [seebeck coefficient (s) and electrical conductivity (σ)] between room temperature (rt) and 525 k were carried out on a zinc-poor specimen. the sequentially measured s and σ data in the same measurement cycle show sharp changes in their absolute values between 450 k and 500 k during the heating cycle, which is not retraced back during cooling. a repeat measurement carried out on the specimen after ~1 month again shows the sharp changes in the absolute values between 450 k and 500 k, indicating reversibility of the process. temperature-dependent synchrotron measurements were further carried out between rt and 525 k. formation of elemental sb was observed beyond 400 k. between 450 k and 500 k, movement of zinc from lattice to interstitial position is observed, which is also accompanied by the onset of znsb formation. the overall zinc content within the β-zn4sb3 phase is observed to increase with increasing temperature. these observations indicate that both the overall zinc content and the zni/znl ratio are crucial in stabilizing the β-zn4sb3 phase.

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