کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10653339 | 1002869 | 2005 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Spontaneous disordering of nm-grain-sized polycrystals and clusters of silica stishovite
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Spontaneous disordering of nm-grain-sized polycrystals and clusters of silica stishovite Spontaneous disordering of nm-grain-sized polycrystals and clusters of silica stishovite](/preview/png/10653339.png)
چکیده انگلیسی
We investigate spontaneous structural disordering of nm-grain-sized polycrystals and clusters of stishovite at ambient conditions using molecular dynamics, and compare to disordering in stishovite nanocrystals and single-crystal α-quartz at high pressures. For nanocrystals and clusters at ambient conditions and sub-ns time scales, the extent and rate of disordering increase with the surface-area-to-volume ratio, and the structure becomes completely amorphous if the size is less than about 2 nm. Within the stability field of stishovite, disordering at the grain boundaries is less pronounced. Low-pressure disordering of stishovite structure involves Si coordination number reduction from six to five and finally to four, a process opposite to the pressure-induced amorphization of quartz.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Communications - Volume 136, Issue 2, October 2005, Pages 71-75
Journal: Solid State Communications - Volume 136, Issue 2, October 2005, Pages 71-75
نویسندگان
Sheng-Nian Luo, Lianqing Zheng, Oliver Tschauner,