Nanostructured La(Sr)CrO3 through gel combustion: sintering and electrical behavior.
Nanostructured La(Sr)CrO3 (LSC) powders was prepared through glycine-nitrate gel combustion process. It was shown for the first time that the use of relatively inexpensive CrO3 as a starting material for chromium has a potential for the bulk preparation of sinter-active LSC powder. As-prepared powder when calcined at 700 degrees C resulted in LSC along with a small amount of SrCrO4 as a secondary phase. The powder was found to be composed of soft agglomerates with a particle size of approximately 70-270 nm. The average agglomerate size was found to be 0.95 microm. The cold pressing and sintering of the LSC powder at 1450 degrees C resulted in mono-phasic La0.8Sr0.2CrO3 with 94% of its theoretical density. This is the lowest sintering temperature ever reported for La0.8Sr0.2CrO3. The conductivity of the sintered La0.8Sr0.2CrO3 at 1000 degrees C was found to be approximately 18 S cm(-1).
Nair
Sathi R
SR
Energy Conversion Materials Section, Bhabha Atomic Research Centre, Vashi Complex, Navi Mumbai 400705, India.
Purohit
R D
RD
Sinha
P K
PK
Tyagi
A K
AK
D017608:Chromium Compounds / Q000737:chemistry*; D004563:Electrochemistry / Q000379:methods; D007811:Lanthanum / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D053758:Nanoparticles / Q000737:chemistry; D036103:Nanotechnology / Q000379:methods*; D009566:Nitrates / Q000737:chemistry; D011208:Powders; D012996:Solutions; D013324:Strontium / Q000737:chemistry*; D013696:Temperature; D014961:X-Ray Diffraction
D017608:Chromium Compounds; D009566:Nitrates; D011208:Powders; D012996:Solutions; C016534:lanthanide nitrate; D007811:Lanthanum; C104873:strontium nitrate; C023600:chromic oxide; D013324:Strontium