Processing of 0.7BaTiO 3 –0.3BiScO 3 Solid‐Solution Coatings

Coatings with the 0.7BaTiO 3 –0.3BiScO 3 solid‐solution composition were formed on palladium and single‐crystal (001) SrTiO 3 substrates using a polymeric metal citrate precursor. Solutions of Ti OC l 2 , Ba( NO 3 ) 2 , Sc( NO 3 ) 3 , and Bi( NO 3 ) 3 were mixed with citric acid and polymerized with ethylene glycol. Stable mixed‐metal citrate solutions were formed at pH > 9 and used for coatings. The phase and composition of powders and coatings were characterized using DTA , TGA , SEM , TEM , and X‐ray diffraction. Single‐phase cubic 0.7BaTiO 3 –0.3BiScO 3 solid solutions formed at 600°C. Coatings on Pd using precursors doped with 5 wt% lithium nitrate were dense after sintering at 950°C/1 h. Coatings without lithium nitrate required 1050°C/50 h to densify. Coatings on SrTiO 3 heat‐treated at 1150°C were dense but formed a (Sc,Ti)‐rich second phase.