Compatibility of Lithium Titanate Fused Crystals with Tungsten Sputtered Films

摘要

Compatibility of sputtered tungsten(W) films on lithium titanate (Li_2TiO_3, tritium breeding materials) fused crystals was examined by Rutherford backscattering spectroscopy (RBS). After heating W films on the crystals at 773 K for 1200 s in vacuum of 10~(-6) Pa, some of W atoms migrated to the Li_2TiO_3 crystals, while neither titanium(Ti) nor oxygen(O) atoms diffused into the W film. After further heating from 2400 s to 7200s, this W benavior was accelerated and both titanium(Ti) and oxygen(O) atoms diffused nto the W film.