Fabrication, superconducting Tc and charge transfer of VNx NbNx and TaNx foils

Autor:	J.T. Wang, C. B. Hart, Xiaochu Yang, Jonathan D. Curley, D. J. Phares, C. J. Yen Chen, H. E. Hall, A. J. Viescas, Phoumyphon Sourivong, P. A. Dayton, Kazuaki Kamimura, Tar Pin Chen
Rok vydání:	1996
Předmět:	Superconductivity Physics Analytical chemistry General Physics and Astronomy chemistry.chemical_element Electron Nitrogen Metal Lattice constant Transition metal chemistry visual_art visual_art.visual_art_medium Atomic ratio Atomic physics Stoichiometry
Zdroj:	Physics Letters A. 217:167-175
ISSN:	0375-9601
DOI:	10.1016/0375-9601(96)00340-4
Popis:	Group V transition metal nitride foils were fabricated in an ultrahigh vacuum chamber and superconducting transition temperature ( T c ), lattice parameter ( a 0 ), and electron energy loss (EELS) measurements were performed on these samples. It is found that as a function of increasing nitrogen-to-transition-metal atomic ratio, T c first increases with increasing nitrogen content then decreases before reaching a 1 : 1 transition metal to nitrogen stoichiometry ratio. T c also increases with increasing lattice parameter a 0 and then decreases before reaching the maximum values for a 0 which are about 4.14 A for NV x and 4.392 ± 0.002 A for NbN x . The EELS data indicate that the outermost metal d electrons transfer to nitrogen atoms during formation of transition metal nitrides. However, the possibility of electrons forming covalent bonds cannot be ruled out.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::90508e81ebd622e3a1791a3291428f9a https://doi.org/10.1016/0375-9601(96)00340-4 Zobrazit plný text záznamu Full Text from ScienceDirect