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Low‐Temperature Sintering of La(Ca)CrO 3 Powder Prepared through the Combustion Process
Author(s) -
Nair Sathi Rajachandran,
Purohit Ram Dayal,
Tyagi Avesh Kumar,
Sinha Pankaj Kumar,
Sharma Beant Prakash
Publication year - 2008
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.1551-2916.2007.02105.x
Subject(s) - sintering , calcination , materials science , agglomerate , metallurgy , combustion , chemical engineering , oxide , conductivity , chromium , sol gel , mineralogy , nuclear chemistry , composite material , chemistry , nanotechnology , biochemistry , organic chemistry , engineering , catalysis
Ultrafine La(Ca)CrO 3 (LCC) powder was prepared through the glycine–nitrate gel combustion process. It was shown for the first time that the use of relatively inexpensive CrO 3 as a starting material for chromium has potential for the bulk preparation of sinter‐active LCC powder. As‐prepared powder, when calcined at 700°C, resulted in LCC along with a small amount of CaCrO 4 . The calcined powder was found to be composed of soft agglomerates with a particle size of ≈70–290 nm. The cold pressing and sintering of the calcined powder at 1200°C resulted in the mono‐phasic La 0.7 Ca 0.3 CrO 3 with density ≈98% of its theoretical value. This is the lowest sintering temperature ever reported for La 0.7 Ca 0.3 CrO 3 . The conductivity of the sintered La 0.7 Ca 0.3 CrO 3 at 1000°C was found to be ≈57 S/cm in air. The sintering and electrical behavior achieved for La 0.7 Ca 0.3 CrO 3 may find application as an interconnect material for high‐temperature solid oxide fuel cells if problems with chemical expansion and poor conductivity in fuel can be overcome.