Preparation and Properties of CaZr1-xInxO3-α Proton Conductor

doi:10.3724/SP.J.1077.2012.00427

Abstract

Abstract:

CaZr_1-_xIn_xO_3-_α(x=0, 0.05, 0.10, 0.15) ceramics were synthesized by using solid state reaction method at 1400℃, and then sintered at 1550℃ for 10 h in air. The XRD results show that there exist CaZrO₃and infinitesimal CaIn₂O₄ phases. The AC impedance spectra of the sintered CaZr_1-_xIn_xO_3-_α were measured in the temperature range from 600℃ to 850℃ in argon atmosphere containing water vapor. The relation between conductivity and temperature was obtained, as well as the activation energy. At 800℃, the conductivity of CaZr_1-_xIn_xO_3-_α is 4.64×10^-7S/cm (x=0), 3.06×10^-4 S/cm (x=0.05), 3.89×10^-4 S/cm (x=0.1), 3.93×10^-4 S/cm (x=0.15), respectively. The results show that the conductivities of the samples improves remarkably, the activation energy decreases rapidly with In doping contents increasing. The conductivities slightly increase with the increase of In doping contents (x>0.1), they increases greatly with the increase of temperature. The relationship between In doping contents and conductivity are deduced.

Key words: proton conductor, impedance spectroscopy, conductivity, doping

CLC Number:

O604

LI Ying, LU Sheng-Lu, WANG Chang-Zhen. Preparation and Properties of CaZr_1-_xIn_xO_3-_α Proton Conductor[J]. Journal of Inorganic Materials, 2012, 27(4): 427-432.

Figures/Tables 10

Fig. 1 XRD patterns of CaZr1-xInxO3-α powders

Fig. 2 Impedance spectra of the sintered CaZr1-xInxO3-α samples at different temperatures

Fig. 3 Measurement and fitted values of impedance spectra for the CaZr1-xInxO3-α samples at different temperatures

Table 1 Sizes of CaZr1-xInxO3-α samples

	x=0	x=0.05	x=0.10	x=0.15
Thickness/mm	2.17	2.21	2.38	2.50
Diameter/mm	8.67	8.54	8.64	8.52

Fig. 4 Arrhenius plots for the CaZr1-xInxO3-α samples

Fig. 5 Change of conductivity of CaZr1-xInxO3-α samples with dopant concentration and temperature

x	lnA	E_a/ eV
0	22.07	2.743
0.05	9.249	0.959
0.10	8.088	0.829
0.15	7.722	0.795

Fig. 6 The relation between Ea and dopant concentration

Fig. 7 Arrhenius plots and conductivity calculated value for the CaZr1-xInxO3-α samples

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