Synthesis and measurement of structural and magnetic properties of K-doped LaCoO3 perovskite materials

• Published in: Rare metals Vol. 29; no. 5; pp. 491 - 500
• Main Authors: Bellakki, Manjunath B., Madhu, C., Greindl, Tobias, Kohli, Sandeep, McCurdy, Patrick, Manivannan, V.
• Format: Journal Article
• Language: English
• Published: Beijing University of Science and Technology Beijing 01-10-2010; Springer Nature B.V; Department of Mechanical Engineering,Colorado State University,Fort Collins,Colorado,USA%Department of Chemistry,Colorado State University,Fort Collins,Colorado,USA
• Subjects: Biomaterials; Ceramics; Chemistry and Materials Science; Combustion; Diffraction; Doping; Energy; LaCoO3; Magnetic properties; Materials Engineering; Materials Science; Metallic Materials; Nanoscale Science and Technology; Order disorder; Physical Chemistry; Rare earth metals; Scanning electron microscopy; Solid oxide fuel cells; 固体氧化物燃料电池; 磁性能; 磁测量; 钙钛矿; 陶瓷材料; X-ray diffraction; structural properties; ceramic materials; magnetic properties; combustion synthesis; X-ray diffiaction
• ISSN: 1001-0521; 1867-7185
• DOI: 10.1007/s12598-010-0155-7

Polycrystalline La1-xKxCoO3 （0≤ x ≤ 0.2） rare earth cobaltates have been synthesized by a solution combustion method using glycine as a fuel. The synthesized ceramic materials were characterized by powder X-ray diffraction （XRD）, scanning electron microscopy （SEM）, Fourier transform infrared spectroscopy （FTIR）, and magnetic measurements and studied for physical properties, such as photoeatalytic activity. FTIR measurements in conjunction with XRD showed that phases beyond 10% K doping are accompanied by small amounts of impurities. Chemical titrations show the presence of Co^4＋ and account for the Co^3＋-Co^4＋ mixed-valency of the system. The parent LaCoO3 shows spin-glass transition at low temperatures, whereas doped samples show transition from spin-glass behavior to paramagnetic ordering on progressive doping of K. ＂Mixed-conductor＂ nature of these ceramics positions them as viable candidates for solid oxide fuel cell （SOFC） applications.