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Processing of 0.7BaTiO 3 –0.3BiScO 3 Solid‐Solution Coatings
Author(s) -
Boakye Emmanuel E.,
Mogilevsky Pavel,
Keller Kristin A.,
Lee HeeDong,
Godar Trenton,
Hay Randall S.
Publication year - 2015
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.12414
Subject(s) - materials science , ethylene glycol , citric acid , solid solution , sintering , phase (matter) , metal , chemical engineering , nuclear chemistry , metallurgy , organic chemistry , chemistry , engineering
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.