کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1332043 979027 2008 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The layered metal Ti2PTe2
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
The layered metal Ti2PTe2
چکیده انگلیسی

Crystals of Ti2PTe2 have been synthesised by chemical vapour transport. Ti2PTe2 crystallises, isostructural to the mineral tetradymite (Bi2STe2), in the space group R3¯m with unit-cell parameters a=3.6387(2) Å and c=28.486(2) Å for the hexagonal setting. In the structure, layers of isolated phosphide and telluride anions form an ordered close sphere-packing with titanium cations filling two-thirds of the octahedral voids. From XANES fluorescence, the presence of Ti4+ is clearly established. In accordance with the ionic formula (Ti4+)2(P3−)(Te2−)2(e−) metallic conductivity (ρ=40 μΩ cm at 300 K) and nearly temperature-independent paramagnetism are found. The electronic band structure shows bands of titanium states crossing the Fermi level in directions corresponding to the ab-plane and a band gap along the c-axis.

Crystal structure of Ti2PTe2 with stacking sequence of the hexagonal layers of anions and cations. Highlighted in red is the octahedral coordination of phosphorus by titanium, and in grey the octahedral coordination of titanium by phosphorus and tellurium.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Solid State Chemistry - Volume 181, Issue 10, October 2008, Pages 2859–2863
نویسندگان
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