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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Nb3Ge by Materials Project

Nb3Ge crystallizes in the tetragonal P4_2/n space group. The structure is three-dimensional. there are three inequivalent Nb sites. In the first Nb site, Nb is bonded in a 2-coordinate geometry to two equivalent Ge atoms. There are one shorter (2.67 Å) and one longer (2.72 Å) Nb–Ge bond lengths. In the second Nb site, Nb is bonded in a 4-coordinate geometry to four equivalent Ge atoms. There are a spread of Nb–Ge bond distances ranging from 2.65–2.73 Å. In the third Nb site, Nb is bonded in a 3-coordinate geometry to three equivalent Ge atoms. There are a spread of Nb–Ge bond distances ranging from 2.62–2.84 Å. Ge is bonded in a 9-coordinate geometry to nine Nb atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Nb3Ge by Materials Project

Nb3Ge crystallizes in the tetragonal I4/mcm space group. The structure is three-dimensional. there are three inequivalent Nb sites. In the first Nb site, Nb is bonded in a 4-coordinate geometry to two equivalent Nb and four equivalent Ge atoms. Both Nb–Nb bond lengths are 2.85 Å. There are a spread of Nb–Ge bond distances ranging from 2.75–3.01 Å. In the second Nb site, Nb is bonded in a 4-coordinate geometry to two equivalent Nb and four equivalent Ge atoms. Both Nb–Nb bond lengths are 2.66 Å. All Nb–Ge bond lengths are 2.72 Å. In the third Nb site, Nb is bonded in a distorted q6 geometry to ten Nb atoms. Both Nb–Nb bond lengths are 2.66 Å. Ge is bonded in a 10-coordinate geometry to ten Nb atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2023

Commissioning of new CVD/ALD Furnace at Fermilab

The new CVD/ALD furnace that we are commissioning at Fermilab will allow us to deposit thin films of superconducting materials on RF cavities on different shapes, 1 cell and 9 cells 1.3GHz and 1 cell and 5 cells 650MHz. This furnace is capable to perform two different types of deposition: chemical vapor deposition and atomic layer deposition. Different materials are under investigation to push accelerating superconducting RF cavities to support higher accelerating fields and to operate with lower power loss. The first tests are focusing on the alternative A15 superconductors as: Nb3Ge, Nd3Ga, Nb3Sn, V3Si. The furnace has two different sources of precursors: 1) chlorine furnace, where we can produce the precursors in-situ, so we can build our own precursors and test how the deposited material is affecting the cavity performance, 2) 6 different bubblers, 3 low temperature bubblers and 3 high temperature bubblers. The deposition chamber is a versatile chamber with two independ ent vacuum volumes, to ensure a higher cleanliness of the deposited material. The furnace is designed to have two different configurations: High temperature, up to 1400 C, and low temperature, up to 400 C.

Grassellino, Laura↗