Synthesis and Characterization of La0.6M0.4Fe0.8Cr0.2O3-δ(M= Ca, Sr,Ba) by GNP Method and Conductivity

Abstract

Abstract: La_0.6M_0.4Fe_0.8Cr_0.2O_3-δ(M=Ca, Sr, Ba) fine powders were synthesized by a glycine-nitrate process(GNP). BET test shows that the specific area of the obtained powders is
over 20 m²·g^-1. XRD test shows that the crystalline structure formed is at the stage of ignition by the method, the powder of La_0.6Ca_0.4Fe_0.8Cr_0.2O_3-δ(LCFC) is pure cubic
perovskite-type after calcined at 850℃ for 2h, and its relative density (sintered at 1100℃) is 95%. The primary powders of LSFC and LBFC are with two-phase structure and with poor sintering
activities than that of LCFC at low temperature. The relative density of these ceramics sintered over 1300℃ is 95%. Four-probe technique tests indicate that the conductivity of doped-samples
is two orders of magnitude higher than that of LaFeO₃, The changes of conductivity with temperature below 700℃ are in accord with the conduction mechanism of small polarons. The electrical
conductivity of LCFC at 800℃ is over 50 S/cm which indicates that LCFC may have potential application for IT-SOFC cathode.

Key words: GNP, La_0.6M_0.4Fe_0.8Cr_0.2O_3-δ（M, Sr, Ba）, IT-SOFC, cathode

CLC Number:

TQ174

CHEN Yong-Hong,WEI Yi-Jun,GAO Jan-Feng,LIU Xing-Qin,MENG Guang-Yao. Synthesis and Characterization of La_0.6M_0.4Fe_0.8Cr_0.2O_3-δ(M= Ca, Sr,Ba) by GNP Method and Conductivity[J]. Journal of Inorganic Materials.

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Synthesis and Characterization of La_0.6M_0.4Fe_0.8Cr_0.2O_3-δ(M= Ca, Sr,Ba) by GNP Method and Conductivity

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