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Niobium triselenide
Niobium triselenide is an inorganic compound belonging to the class of transition metal trichalcogenides. It has the formula NbSe3. It was the first reported example of one-dimensional compound to exhibit the phenomenon of sliding charge density waves. Due to its many studies and exhibited phenomena in quantum mechanics, niobium triselenide has become the model system for quasi-1-D charge density waves.
==Structure==
Although oxidation states are somewhat artificial for semiconductors, they provide a useful way to classify compounds. NbSe3 is viewed as Nb4+(Se2−)(Se22−), i.e., it contains both selenide and diselenide subunits.
The Nb center is bound within a trigonal prismatic Se6 coordination sphere descr The Se---Se bond lengths are 2.37, 2.48, 2.91 Angstroms. The NbSe6 subunits form infinite chains lined up in parallel. Although the prisms share the same coordination, the cell consists of three chain types repeated twice, where each chain is defined by its Se-Se bond length. The high anisotropy of this structure results in the anisotropic crystallization of NbSe3, forming a ribbon-like fibre.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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