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Citation: CHENG Le-Hua, WANG Min, CHEN Yong-Hong. Synthesis and Characterization of Perovskite-Type Composite Oxides of La_0.7-xSr_xNd_0.3FeO_3-δ[J]. Chinese Journal of Applied Chemistry, ;2006, 23(5): 561-565. shu

Synthesis and Characterization of Perovskite-Type Composite Oxides of La_0.7-xSr_xNd_0.3FeO_3-δ

1.
a Department of Chemistry, Chaohu College, Chaohu 238000;
2.
b Center of Experiment and Communication, Huainan Normal College, Huainan

Corresponding author: CHENG Le-Hua,
Received Date: 20 July 2005
Available Online: 10 October 2005

Perovskite-type Composite Oxides of La_0.7-xSr_xNd_0.3FeO_3-δ(x=0.1,0.2,0.3) were synthesized by the auto combustion method with the metal nitrate as oxidizing reagent and glycine as reducing agent.The specific areas of the synthesized powders were measured by nitrogen adsorption method.The formation conditions,crystalline structure and microstructure of the samples were investigated with XRD,TG-DSC,TEM and SEM.The experimental results show that the single Perovskite-type phase was obtained after the powders calcined at 900℃ for 2 h.The electrical conductivities of the ceramics were determined by four-probe DC method in the temperature range of 450~800℃ in air.The specific area of the species decreases and the particle size increases with the increase of Sr content,and the crystal system transforms from orthorhombic to cubic gradually.The conduction mechanism is attributable to the adiabatic hopping of small polarons.The La_0.5Sr_0.2Nd_0.3FeO_3-δ sample sintered at 1 300℃ for 2 h shows the highest conductivity.
- cathode materials,
- doping rare earths ferrites,
- conductivity
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Synthesis and Characterization of Perovskite-Type Composite Oxides of La0.7-xSrxNd0.3FeO3-δ

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通讯作者: 陈斌, bchen63@163.com

Synthesis and Characterization of Perovskite-Type Composite Oxides of La_0.7-xSr_xNd_0.3FeO_3-δ