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• W2013118726 abstract "The local structure of crystalline ${mathrm{Ge}}_{8}{mathrm{Sb}}_{2}{mathrm{Te}}_{11}$ over a temperature range from 10 K to 480 K was studied. While a rhombohedral to rock-salt-like structural transition is clearly observed at 385 K via x ray (Bragg) diffraction, an x-ray absorption study shows that the local structure associated with the rhombohedral configuration at 10 K, where six Ge(Sb)-Te bonds are split into three shorter and three longer bonds, remains unchanged across the transition temperature, ${T}_{c}$. Based upon a fit of the experimental data to a correlated Einstein model, the shorter Sb-Te bond was found to be stiffer than its Ge-Te counterpart. Using DFT calculations, a tendency for the shorter bonds to localize around vacancies was noted, clearly displaying an increase in static disorder in Ge-Sb-Te alloys with respect to pure GeTe. This increase in static disorder may be directly related to the decrease in ${T}_{c}$ observed when GeTe is alloyed with ${mathrm{Sb}}_{2}{mathrm{Te}}_{3}$. Total energy calculations found the coupling of Sb-Te and a vacancy to be energetically the most favorable in Ge-Sb-Te compounds, where vacancies serve to buffer internal stresses caused by the Sb-Te bonds." @default.
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• W2013118726 date "2011-09-07" @default.
• W2013118726 modified "2023-10-01" @default.
• W2013118726 title "Local atomic order of crystalline Ge<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mrow /><mml:mn>8</mml:mn></mml:msub></mml:math>Sb<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>Te<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mrow /><mml:mn>11</mml:mn></mml:msub></mml:math>across the ferroelectric to paraelectric …" @default.
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• W2013118726 doi "https://doi.org/10.1103/physrevb.84.104106" @default.
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