کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10714090 | 1025568 | 2012 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Structural, electronic and elastic properties of potassium hexatitanate crystal from first-principles calculations
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The structural, electronic and elastic properties of potassium hexatitanate (K2Ti6O13) whisker were investigated using first-principles calculations. The calculated cell parameters of K2Ti6O13 including lattice constants and atomic positions are in good agreement with the experimental data. The obtained formation enthalpy (â61.1535 eV/atom) and cohesive energy (â137.4502 eV/atom) are both negative, showing its high structural stability. Further analysis of the electronic structures shows that the potassium hexatitanate is a wide-band semiconductor. Within K2Ti6O13 crystal, the Tiî¸O bonding interactions are stronger than that of Kî¸O, while no apparent Kî¸Ti bonding interactions can be observed. The structural stability of K2Ti6O13 was closely associated with the covalent bond interactions between Ti (d) and O (p) orbits. Further calculations on elastic properties show that K2Ti6O13 is a high stiffness and brittle material with small anisotropy in shear and compression.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica B: Condensed Matter - Volume 407, Issue 14, 15 July 2012, Pages 2811-2815
Journal: Physica B: Condensed Matter - Volume 407, Issue 14, 15 July 2012, Pages 2811-2815
نویسندگان
Hua Manyu, Li Yimin, Long Chunguang, Li Xia,