The effects of additives and precipitants on the syntheses of doped
LaCrO3 (lanthanum chromites) were studied by hydrothermal reaction
at temperature ranges of 100℃ to 230℃. LaCrO3 nanopowders were
synthesized by hydrothermal methods using several types of
precipitants such as NaOH, KOH, NH4OH, and NH2CONH2.
The influence of Sr, Ca and Co doping on the lanthanum chromites prepared by
hydrothermal method were investigated. The synthesized nanopowders were
characterized by means of XRD, SEM and densitometer. The electrical
conductivity of the doped LaCrO3 was studied at 750℃ in air by a DC
four point probe method. The particles size of undoped LaCrO3 nanopowder was approximately 100 nm when using KOH as a
precipitant. The relative density of lanthanum chromite doped with calcium and
cobalt is over 97%. The highest electrical conductivity of La0.62Ca0.38Co0.18Cr0.82O3 was 32.75 S/cm at 750℃ in air, which is 30 times higher than undoped LaCrO3.
The density and electrical conductivity are increased by doping cobalt and
calcium on the LaCrO3.
Cite this paper
M. Kang, J. Yun, C. Cho, C. Kim and W. Tai, "Syntheses of Doped-LaCrO3
Nanopowders by Hydrothermal Method," Open Journal of Inorganic Non-metallic Materials
, Vol. 3 No. 3, 2013, pp. 27-42. doi: 10.4236/ojinm.2013.33007
 Delphi Corporation, “SOFC Interconnect Development,” Seminar Report, DOE Award No DEFC26-01NT41022, 2003.
 J. W. Fergus, “Ceramic Coatings for Metallic SOFC Interconnects,” Supplemental Proceedings: Vol. 1: Materials Processing and Properties, 2008, pp. 555-560.
 Z. W. Zhong and Y. Mi, “Perspectives on the Metallic Interconnects for Solid Oxide Fuel Cells,” Journal of Zhejiang University, Vol. 5, No. 12, 2004, p. 1471.
 Y. J. Yang, T. L. Wen, H. Tu, D. Q. Wang and J. Yang, “Characteristics of Lanthanum Strontium Chromite Prepared by Glycine Nitrate Process,” Solid State Ionics, Vol. 135, No. 1-4, 2000, pp. 475-479.
 Y. K. Lee and J. W. Park, “Reactions of (La,Ca)CrO3
Sealants in Yttria-Stabilized Zirconia-(La,Ca)CrO3
Planar Solid Oxide Fuel Cell (SOFC) Stacks,” Mat. Chem and Phys, Vol. 45, No. 2, 1966, pp. 97-102.
 T. Kikkawa, M. Yoshinaka, K. Hirota and O. Yamaguchi, “Synthesis of LaCrO3 by the Hydrazine Method,” Journal of Materials Science Letters, Vol. 14, No. 15, 1995, p. 1071.
 M. R. De Guire, S. E. Dorris, R. B. Poeppel, S. Morissette and U. Balachandran, “Coprecipitation Synthesis of Doped Lanthanum Chromite,” Journal of Materials Research, Vol. 8, No. 9, 1993, pp. 2327-2335.
 S. Bliger, G. Blab and R. Forthmann, “Sol-Gel Synthesis of Lanthanum Chromite Powder,” Journal of the European Ceramic Society, Vol. 17, No. 8, 1997, pp. 1027-1031. doi:10.1016/S0955-2219(96)00182-3
 M. Yoshimura, S. T. Song and S. Somiya, “Synthesis of LaCrO3 under Hydrothermal Conditions,” Journal of the Ceramic Association, Vol. 90, No. 1038, 1982, pp. 91-95.
 J. Moon, M. Awano and K. Maeda, “Hydrothermal Synthesis and Formation Mechanisms of Lanthanum Tin Pyrochlore Oxide,” Journal of the American Ceramic Society, Vol. 84, No. 11, 2001, pp. 2531-2536.
 L. P. Rivas-Vazquez, et al, “Preparation of Calcium Doped LaCrO3 Fine Powders by Hydrothermal Method and Its Sintering,” Journal of the European Ceramic Society, Vol. 26, No. 1-2, 2006, pp. 81-88.
 M. R. Morelli, B. Derby and R. J. Brook, “Sinterizacao Por Fase Liquida de LaCrO3,” CERAMICA-SAO PAULO, Vol. 42, 1996, pp. 603-606.
 J. D. Carter, H. U. Anderson and M. G. Shunmsky, “Structure and Phase Transformation of Lanthanum Chromate,” Journal of Materials Science, Vol. 31, No. 2, 1996, pp. 551-557. doi:10.1007/BF01139176
 A. E. Gobichon, J. P. Auffrédic and D. Louër, “A Temperature-Dependent Powder Diffraction Study of Chromium Lanthanum Nitrate, LaCr(NO3
O,” Powder Diffraction, Vol. 15, No. 1, 2000, pp. 23-25.
 S. P. S. Badwal, “Stability of Solid Oxide Fuel Cell Components,” Solid State Ionics, Vol. 143, No. 1, 2001, pp. 39-46. doi:10.1016/S0167-2738(01)00831-1
 J. W. Fergus, “Lanthanum Chromite-Based Materials for Solid Oxide Fuel Cell Interconnects,” Solid State Ionics, Vol. 171, No. 1-2, 2004, pp. 1-15.
 N. Q. Minh, “Ceramic Fuel Cells,” Journal of the American Ceramic Society, Vol. 76, No. 3, 1993, pp. 563-588.
 L. Salgado and F. A. Filho, “Sintering of Cobalt and Strontium Doped Lanthanum Chromite Obtained by Combustion Synthesis,” Materials Science Forum, Vol. 530-531, 2006, pp. 671-676.