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| 磷灰石结构电解质La_(10-x)Si_6O_(27-1.5x)的合成及电性质 | |
| 引用本文： | 张兰,何洪泉,蒋三平,张玉军.磷灰石结构电解质La_(10-x)Si_6O_(27-1.5x)的合成及电性质[J].电源技术,2009,33(11). |
| 作者姓名： | 张兰 何洪泉 蒋三平 张玉军 |
| 作者单位： | 1. 南洋理工大学,机械与航天航空学院,新加坡,639798;山东大学,材料科学与工程学院材料液态结构及其遗传性教育部重点实验室,山东,济南,250061 2. 南洋理工大学,机械与航天航空学院,新加坡,639798 3. 山东大学,材料科学与工程学院材料液态结构及其遗传性教育部重点实验室,山东,济南,250061 |
| 基金项目： | 新加坡教育部Academic Research Fund AcRF tier 2 |
| 摘 要： | 以La_2O_3和SiO_2为原料,采用凝胶注模工艺合成了具有磷灰石结构晶相的固体电解质材料La_(10-x)Si_6O_(27-1.5x)(x=0,0.5).通过X射线衍射光谱法(XRD)对所得化合物的结构进行表征.在300～800 ℃的温度范围内,利用电化学阻抗谱详细研究了La_(10-x)Si_6O_(27-1.5x)陶瓷的烧结温度和La元素的含量对La_(10-x)Si_6O_(27-1.5x)电导率的影响.结果表明:陶瓷样品的烧结温度对其电导率的影响较大,La_(10)Si_6O_(27)的电导率随着陶瓷样品烧结温度的上升而提高,1 650 ℃烧结的La_(10)Si_6O_(27)在800℃电导率为3.46×10~(-2) S/cm,约是1 550 ℃烧结样品的6倍.La_(9.5)Si_6O(26.25)的电导率随着陶瓷样品烧结温度上升呈先上升后下降的变化趋势,当烧结温度高于1 600℃时,晶粒和晶界内有大量未知相析出,这可能是导致其电导率反而下降的直接原因. |
| 关 键 词： | 凝胶注模工艺 磷灰石结构 电解质 电导率 固体氧化物燃料电池 |
Synthesis and conducting properties of La_(10-x)Si_6O_(27-1.5x) |
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| ZHANG Lan,HE Hong-quan,JIANG San-ping,ZHANG Yu-jun.Synthesis and conducting properties of La_(10-x)Si_6O_(27-1.5x)[J].Chinese Journal of Power Sources,2009,33(11). | |
| Authors: | ZHANG Lan HE Hong-quan JIANG San-ping ZHANG Yu-jun |
| Affiliation: | ZHANG Lan1,2,HE Hong-quan1,JIANG San-ping1,ZHANG Yu-jun2(1.School of Mechanical and Aerospace Engineering,Nanyang Technological University 639798,Singapore,2.Key Lab for Liquid Structure and Heredity of Ministry of Education,School of Materials Science and Engineering,Shandong University,Jinan Shandong 250061,China) |
| Abstract: | Apatite-type La_(10-x)Si_6O_(27-1.5x)(x=0,0.5) was successfully synthesized by water-based gel-casting technique,using La_2O_3 and SiO_2 as raw materials.The apatite phases were characterized by X-ray diffraction (XRD).The effect of sintering temperature and lanthanum content on the conducting properties of La_(10-x)Si_6O_(27-1.5x) was investigated by electrochemical impedance spectroscopy (EIS) at 300-800 ℃.It is found that the conductivity is significantly influenced by the sintering temperature and lanthanum content.The conductivity of La_(10)Si_6O_(27) is increased with the increase of sintering temperature,and the conductivity of La_(10)Si_6O_(27) sintered at 1 850 ℃ is 6 times higher than that of La_(10)Si_6O_(27) sintered at 1 550 ℃.However,the conductivity of La_(9.5)Si_6O_(26.25) increases with the increase of sintering temperature and reaches a maximum at 1 600 ℃,and the conductivity decreases again when the sintering temperature is higher than 1 600 ℃,which is due to the unknown phases formed on the samples. |
| Keywords: | gel casting apatite electrolyte conductivity solid oxide fuel cell |
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