کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1333883 979112 2007 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Electronic structure, galvanomagnetic and magnetic properties of the bismuth subhalides Bi4I4 and Bi4Br4
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Electronic structure, galvanomagnetic and magnetic properties of the bismuth subhalides Bi4I4 and Bi4Br4
چکیده انگلیسی

Two bismuth-rich subhalides, Bi4Br4 and Bi4I4, featuring extended quasi one-dimensional metallic fragments in their structures, have been investigated. The gas-phase technique of crystal growth has been refined for obtaining large (up to 5 mm long) single crystals. Electronic structure calculations on three-dimensional structures of both compounds have been performed (DFT level, hybrid B3LYP functional), predicting a semiconducting behavior for both compounds, with an indication of possible directional anisotropy of electric conductivity. Galvanomagnetic (resistance, magnetoresistance, Hall effect, thermopower) and magnetic (temperature and field dependence of magnetization) properties have been measured experimentally. Both compounds are found to be diamagnetic, room-temperature semiconductors with n-type conductivity. While Bi4Br4 demonstrates a typical case of one dimensionality, the difference in magnetoresistivity between Bi4Br4 and Bi4I4 indicates some weak interactions between isolated bismuth metallic fragments within the bismuth substructures.

Quasi one-dimensional compounds Bi4Br4 and Bi4I4 have been investigated theoretically (electronic structure calculations) and experimentally (galvanomagnetic and magnetic measurements). Both compounds are found to be diamagnetic, room-temperature semiconductors with n-type conductivity and a possibility of significant directional anisotropy. Magnetoresistivity data indicate some weak interactions between isolated bismuth fragments in Bi4I4.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Solid State Chemistry - Volume 180, Issue 3, March 2007, Pages 1103–1109
نویسندگان
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