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Sol–Gel Coating of Powders for Processing Electronic Ceramics
Author(s) -
SELMI FATHI A.,
AMARAKOON VASANTHA R. W.
Publication year - 1988
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1988.tb07561.x
Subject(s) - thermistor , materials science , sol gel , coating , ceramic , dopant , doping , microstructure , phase (matter) , composite material , chemical engineering , nanotechnology , chemistry , optoelectronics , electrical engineering , engineering , organic chemistry
A new technique (sol‐gel coating of powders) was utilized to process electronic ceramics such as Sb‐doped SnO 2 and positive‐temperature‐coefficient‐of‐resistance (PTCR) BaTiO 3 thermistors. Sol‐gel coatings resulted in the densification via a liquid phase of Sb‐doped SnO 2 powders. PTCR thermistors were developed from BaTiO 3 powders coated by a sol‐gel composition containing dopants ( Y ), counterdopants (Mn, F), and additives (Si) with uniform microstructures and improved properties. Incorporation of F via the sol‐gel coating increased the reliability of PTCR devices, making them less sensitive to reducing environments. This process may be extended to the processing of other electronic materials.