1. Synthesis and characterization of turbostratically disordered (BiSe)1.15TiSe2
- Author
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Matthias Falmbigl, David W. Johnson, Daniel B. Moore, Mark N Coffey, Devin R. Merrill, and Adam W. Jansons
- Subjects
Diffraction ,Materials science ,chemistry.chemical_element ,Electron ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials ,Bismuth ,Metal ,Crystal ,Crystallography ,chemistry ,Electrical resistivity and conductivity ,visual_art ,Materials Chemistry ,visual_art.visual_art_medium ,Orthorhombic crystal system ,Specular reflection ,Electrical and Electronic Engineering - Abstract
The synthesis and characterization of turbostratically disordered (BiSe)1.15TiSe2 is reported. Specular and in-plane x-ray diffraction studies indicate an alternating structure containing two planes of a distorted rock salt structured BiSe and a Se–Ti–Se trilayer of TiSe2 with independent lattices. The title compound was found to be turbostratically (rotationally) disordered about the c-axis, and the BiSe layer displays an orthorhombic in-plane structure with a = 4.562(2) A and b = 4.242(1) A. Temperature dependent electrical resistivity reveals that the disordered compound is metallic, but with less temperature dependence than may be expected for a 3D crystal, which is attributed to the lack of coherent vibrations due to the turbostratic disorder. The room temperature resistivity was found to be ρ = 5.0 × 10−6 Ωm with a carrier concentration of n = 5 × 1021 cm−3. Comparing the carrier concentration to (PbSe)1.16TiSe2 suggests that the bismuth is trivalent and donates an electron to the conduction band of the TiSe2 constituent.
- Published
- 2014
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