W2O3I4 and WO2I2: metallic phases in the chemical transport reaction of tungsten

Autor:	Manuel Löber, Hans-Jürgen Meyer, Markus Ströbele, Carl P. Romao
Rok vydání:	2021
Předmět:	Materials science chemistry.chemical_element Crystal structure Tungsten Inorganic Chemistry Metal chemistry Chemical physics Phase (matter) Metallic conductivity visual_art visual_art.visual_art_medium Black colored Chemical transport reaction Electronic band structure
Zdroj:	Dalton Transactions. 50:6789-6792
ISSN:	1477-9234 1477-9226
DOI:	10.1039/d1dt01212f
Popis:	The crystal structures of the hitherto unknown phase W2O3I4 and of WO2I2, a compound that is known to play an important role in the chemical vapor transport of elemental tungsten are reported. We demonstrate that WO2I2 transforms into W2O3I4, and then into WO2 with increasing temperature. Crystals of WO2I2 appear as thin platelets, showing metallic luster; crystals of W2O3I4 appear as black colored needle-shaped platelets. Both compounds adopt layered structures; electronic band structure calculations reveal metallic conductivity for W2O3I4 and surprisingly also for WO2I2.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::cd5d1bfe31fdc3d21c3f32d944683a21 https://doi.org/10.1039/d1dt01212f Zobrazit plný text záznamu