Abstract
With the help of first-principles molecular dynamics calculations, we obtained the atomic picture of amorphous AlSb(a-AlSb) for phase-change memory application. Generally, a-AlSb shows sp 3 bonding network, which is the intrinsic characteristic for its good thermal stability. Significant wrong(homogenous) Al-Al bonds can also be observed from the pair correlation function. This hints the amorphous phase may consist of Al cluster and Sb-rich Al-Sb alloy. Recent experiment has observed the Sb-rich region of AlSb alloy can be switched to crystal, on the basis of which, combined with our calculations, we thus propose that on the one hand such a Sb-rich region in a-AlSb can retain the rapid crystallization like pure Sb solid and on the other hand some Al atoms play the important role of stabilizing Sb rich network with sp 3 bonding. The present study offers a microscopic view to understand the phase change mechanism of AlSb alloy for information storage device.
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Supported by the China Postdoctoral Science Foundation(No.2013T60315) and the National Natural Science Foundation of China(No.11374119).
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Sun, Y., Wang, X., Du, J. et al. Amorphous structure and bonding chemistry of aluminium antimonide(AlSb)) alloy for phase-change memory device. Chem. Res. Chin. Univ. 32, 76–81 (2016). https://doi.org/10.1007/s40242-016-5345-x
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DOI: https://doi.org/10.1007/s40242-016-5345-x