Variation of T/sub c/ of sputtered Nb$sub 3$Ge

Conference · Sat Mar 01 04:00:00 EDT 1975 · IEEE Trans. Magn., v. MAG-11, no. 2, pp. 225-226

OSTI ID:4118191

Ghosh, A K; Pendrys, L; Douglass, D H

Alloy samples of Nb and Ge were prepared by simultaneous rf sputtering of composite Nb--Ge targets onto heated alumina substrates. Variation of the superconducting transition temperature T/sub c/ and the x-ray properties of these specimens were studied as a function of the alloy composition, in the neighborhood of Nb$sub 3$Ge. Variation of the sputtering parameters, i.e., the self bias voltage, sputtering gas pressure, and substrate temperature was also studied. Results indicate that high T/sub c/ occur for well-ordered stochiometric Nb$sub 3$Ge alloys. It was also found that the competing tetragonal phases are promoted by the highly energetic atoms, i.e., at high sputtering rates. The relative sticking probability of Ge is important at the higher substrate temperatures. (auth)

• Research Organization: Univ. of Rochester, NY
• NSA Number: NSA-33-017700
• OSTI ID: 4118191
• Conference Information: Journal Name: IEEE Trans. Magn., v. MAG-11, no. 2, pp. 225-226
• Country of Publication: United States
• Language: English

Related Subjects

*GERMANIUM ALLOYS-- TRANSITION TEMPERATURE
*NIOBIUM BASE ALLOYS-- TRANSITION TEMPERATURE
360101* --Materials--Metals & Alloys--Preparation & Fabrication
N50220* --Metals
Ceramics
& Other Materials--Metals & Alloys--Preparation & Fabrication
N50230 --Metals
Ceramics
& Other Materials--Metals & Alloys--Properties
Structure & Phase Studies
N66200 --Physics (Low Temperature)--Superconductivity
SUPERCONDUCTIVITY