CaZr1-xInxO3-α(x=0, 0.05, 0.10, 0.15)质子导体的电学性能

doi:10.3724/SP.J.1077.2012.00427

摘要/Abstract

摘要：

采用固相反应法在1400℃合成了CaZr_1-_xIn_xO_3-_α(x=0, 0.05, 0.10, 0.15)陶瓷粉体, 在空气中1550℃, 10 h对材料进行二次烧结. XRD物相分析结果确定合成后的样品中有CaZrO₃和微量CaIn₂O₄存在. 实验在600’850℃含水氩气中测量了样品的交流阻抗谱, 计算出其电导率随温度变化的规律和电导激活能. 在800℃时, CaZr_1-_xIn_xO_3-_α的电导率分别为4.64×10^-7S/cm(x=0)、3.06×10^-4 S/cm(x=0.05)、3.89×10^-4 S/cm(x=0.10)、3.93×10^-4 S/cm (x=0.15). 研究结果表明: 对CaZrO₃掺In能显著提高材料的电导率, 降低电导激活能, 掺杂量x>0.1时, 电导率增加变缓, 并且电导率随温度的升高而增大. 研究得到CaZr_1-_xIn_xO_3-_α的电导率与掺杂量的关系式.

关键词: 质子导体, 阻抗谱, 电导率, 掺杂

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

中图分类号:

O604

厉英, 逯圣路, 王常珍. CaZr_1-_xIn_xO_3-_α(x=0, 0.05, 0.10, 0.15)质子导体的电学性能[J]. 无机材料学报, 2012, 27(4): 427-432.

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.

图/表 10

图1 CaZr1-xInxO3-α粉体的XRD图谱

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

图2 CaZr1-xInxO3-α在不同温度下的阻抗谱图

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

图3 CaZr1-xInxO3-α在不同温度下的阻抗谱实测值与拟合值

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

图4 CaZr1-xInxO3-α的Arrhenius曲线

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

图5 CaZr1-xInxO3-α电导率随掺杂量及温度的变化曲线

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

图6 电导激活能与掺杂量的关系

Fig. 6 The relation between Ea and dopant concentration

图7 CaZr1-xInxO3-α的Arrhenius曲线及电导率计算值

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

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