Synthesis of Various LaMO3 Perovskites in Molten Carbonates

Lanthanum-containing perovskites, LaMO3 (M=Al, Sc, Cr, Mn, Fe, Co, Ni, Ga, and In), have been synthesized in molten carbonates from a mixture of lanthanum carbonate and an M-containing oxide or an acetate, or from a co-precipitation mixture of metal (M) and lanthanum. Metal aluminum, chromium, and iron, immersed in a mixture of molten (Li0.52Na0.48)2CO3 and lanthanum carbonate at 923 K, were covered, respectively, with LaAlO3, LaCrO3, and LaFeO3. Ceramic and single-crystal α-Al2O3, immersed in molten (Li0.52Na0.48)2CO3 mixed with lanthanum carbonate, were also covered with LaAlO3. In situ X-ray diffractometry revealed that La2O2CO3 reacted with α-LiAlO2 to yield LaAlO3; the reaction proceeded faster under N2 than under a CO2 atmosphere.

[1]  P. Ferro,et al.  Low‐Temperature Synthesis and Properties of LaMnO3±d and La0.67R0.33MnO3±d (R = Ca, Sr, Ba) from Citrate Precursors , 2003 .

[2]  Liquan Chen,et al.  The effects of dopant valence on the structure and electrical conductivity of LaInO3 , 2001 .

[3]  J. Darriet,et al.  Crystal growth and structure determination of barium rhodates: stepping stones toward 2H-BaRhO3. , 2004, Journal of the American Chemical Society.

[4]  G. Meng,et al.  Hydrothermal synthesis and characterization of LaCrO3 , 1999 .

[5]  T. Tagawa,et al.  Ceramic anode catalyst for dry methane type molten carbonate fuel cell , 2004 .

[6]  N. Minh.  Ceramic Fuel Cells , 1993 .

[7]  Yukio Morii,et al.  Crystal Structure and Diffusion Path in the Fast Lithium-Ion Conductor La0.62Li0.16TiO3 , 2005 .

[8]  H. Wendt,et al.  Development of materials and production technologies for molten carbonate fuel cells , 1994 .

[9]  Koichi Matsuzawa,et al.  The effect of La oxide additive on the solubility of NiO in molten carbonates , 2005 .

[10]  Seulbee Lee,et al.  Sol–gel derived (La0.8M0.2)CrO3 (MCa, Sr) coating layer on stainless-steel substrate for use as a separator in intermediate-temperature solid oxide fuel cell , 2006 .

[11]  A. Stacy,et al.  Low-temperature, flux-grown, Na-doped LaMnO3: Magnetic properties , 1997 .

[12]  J. Goodenough,et al.  Superior Perovskite Oxide‐Ion Conductor; Strontium‐ and Magnesium‐Doped LaGaO3: II, ac Impedance Spectroscopy , 2005 .

[13]  M. S. Hegde,et al.  Low temperature synthesis, structure and properties of alkali-doped La2NiO4, LaNiO3 and LaNi0.85Cu0.15O3 from alkali hydroxide fluxes , 2003 .

[14]  Y. Morii,et al.  Crystal Structure of a Lithium Ion-Conducting Perovskite La2/3−xLi3xTiO3 (x=0.05) , 2002 .

[15]  J. Goodenough,et al.  Sol‐Gel Synthesis of a New Oxide‐Ion Conductor Sr‐ and Mg‐Doped LaGaO3 Perovskite , 1996 .

[16]  B. Post,et al.  Rare Earth Nickel Oxides , 1957 .

[17]  S. Behera,et al.  Low temperature synthesis of microwave dielectric LaAlO3 nanoparticles: effect of chloride on phase evolution and morphology , 2004 .

[18]  K. Fung,et al.  A and B-site substitution of the solid electrolyte LaGaO3 and LaAlO3 with the alkaline-earth oxides MgO and SrO , 2004 .

[19]  F. Izumi,et al.  A Rietveld-Analysis Programm RIETAN-98 and its Applications to Zeolites , 2000 .

[20]  Daxiang Huang,et al.  Characterization of β‐Silicon Carbide Powders Synthesized by the Carbothermal Reduction of Silicon Carbide Precursors , 1998 .

[21]  Koichi Matsuzawa,et al.  Improvement of MCFC cathode stability by additives , 2002 .

[22]  H. Inaba,et al.  Structural phase transition of perovskite oxides LaMO3 and La0.9Sr0.1MO3 with different size of B-site ions , 2001 .