کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4742075 1641557 2010 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Elasticity of (K,Na)AlSi3O8 hollandite from lattice dynamics calculations
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فیزیک زمین (ژئو فیزیک)
پیش نمایش صفحه اول مقاله
Elasticity of (K,Na)AlSi3O8 hollandite from lattice dynamics calculations
چکیده انگلیسی

We compute the elastic constants tensor and the seismic properties of KAlSi3O8 and K0.8Na0.2AlSi3O8 up to the ferroelastic transition using density-functional theory and density-functional perturbation theory in the ABINIT implementation. We observe a softening of the tetragonal shear with pressure that precedes the ferroelastic transition. The Reuss shear moduli become negative at respectively 23 GPa and 13 GPa for the two compositions considered in here. The ferroelastic transition is associated with a strong decrease of the horizontal shear wave velocities and a corresponding increase of the seismic anisotropy. The presence of Na enhances these features.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics of the Earth and Planetary Interiors - Volume 181, Issues 1–2, July 2010, Pages 21–26
نویسندگان
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