Title :
Niobium and niobium-titanium nitrides for RF applications
Author :
Fabbricatore, P. ; Gemme, G. ; Musenich, R. ; Parodi, R. ; Viviani, M. ; Zhang, B. ; Buscaglia, V.
Author_Institution :
INFN, Genova, Italy
fDate :
3/1/1993 12:00:00 AM
Abstract :
The application of niobium and niobium-titanium nitrides in RF devices is studied. Nitride samples, prepared by diffusion of nitrogen in bulk niobium and alloy, have been characterized by X-ray diffraction, SEM and AC magnetic measurements. Several phases of niobium nitride have been observed: the phase with higher nitrogen content, at the sample surface, has critical temperature about 15 K but inclusions of both lower T/sub c/ and nonsuperconducting phases enhance the RF surface resistance. The niobium-titanium nitride surface is composed by a phase having critical temperature up to 17 K and unwanted phases were not observed.<>
Keywords :
X-ray diffraction examination of materials; critical current density (superconductivity); crystal morphology; magnetic susceptibility; magnetisation; niobium; niobium compounds; scanning electron microscope examination of materials; superconducting transition temperature; surface conductivity; titanium compounds; type II superconductors; 15 K; 17 K; AC magnetic measurements; AC susceptibility; N/sub 2/ diffusion; Nb-TiN; NbN; RF devices; RF surface resistance; SEM; X-ray diffraction; critical temperature; magnetisation; morphology; superconducting transition; superconductor; Niobium alloys; Niobium compounds; Nitrogen; Radio frequency; Slabs; Sputtering; Surface resistance; Temperature; Thermal resistance; Titanium compounds;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
