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[1]姜　媛,黄志良*,陈常连*,等.铝掺杂磷灰石型硅酸镧电解质的电导机理[J].武汉工程大学学报,2022,44(01):48-54.[doi:10.19843/j.cnki.CN42-1779/TQ.202010006]
　JIANG Yuan,HUANG Zhiliang*,CHEN Changlian*,et al.Conductance Mechanism of Al-Doped Apatite-Type Lanthanum Silicate Electrolyte[J].Journal of Wuhan Institute of Technology,2022,44(01):48-54.[doi:10.19843/j.cnki.CN42-1779/TQ.202010006]
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铝掺杂磷灰石型硅酸镧电解质的电导机理(/HTML)
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《武汉工程大学学报》[ISSN:1674-2869/CN:42-1779/TQ]

卷:
44
期数:
2022年01期
页码:
48-54
栏目:
材料科学与工程
出版日期:
2022-02-28

文章信息/Info

Title:
Conductance Mechanism of Al-Doped Apatite-Type Lanthanum Silicate Electrolyte
文章编号:
1674 - 2869（2022）01 - 0048 - 07
作者:
姜　媛; 黄志良*; 陈常连*; 鲁　冕; 吴昌胜; 陈　石
武汉工程大学材料科学与工程学院，湖北 武汉 430205
Author(s):
JIANG Yuan; HUANG Zhiliang*; CHEN Changlian*; LU Mian; WU Changsheng; CHEN Shi
School of Materials Science and Engineering，Wuhan Institute of Technology，Wuhan 430205，China
关键词:
燃烧法; 硅酸镧; 固体电解质; 铝掺杂; 电导增强机理
Keywords:
combustion method; lanthanum silicate; solid electrolyte; Al-doped; enhancing mechanism of conductance
分类号:
O646
DOI:
10.19843/j.cnki.CN42-1779/TQ.202010006
文献标志码:
A
摘要:
采用燃烧法在600 ℃下5~7 min内成功制备了铝掺杂的La9.33Si6-xAlxO26-0.5x（x=0.5，1.0，1.5，2.0）（LSAO）固体电解质粉体，在800 ℃预烧12 h后，经压制成型、烧结制得LSAO陶瓷体。X射线衍射、X射线光电子能谱、傅里叶变换红外光谱和扫描电子显微镜证实燃烧法制备的LSAO纯度高，具有典型的P63/m磷灰石型结构；掺杂的Al3+替换了Si4+进入了［SiO4］四面体结构中形成［Si（Al）O4］，并产生了氧空位；在1 500 ℃烧结3 h得到烧结性能最佳的LSAO陶瓷体。电化学阻抗谱显示当掺量x<0.5时，La9.33Si6O26（LSO）的电导率随掺量的增加而增强；当掺量x>0.5时，La9.33Si6O26（LSO）的电导率随掺量的增加而降低，这归因于Al3+掺杂形成氧空位，减小了氧离子传输过程中的空间阻力，电导率增大；然而，当Al3+掺量过多，LSAO结构中间隙氧浓度大量减少，电导率降低。当掺量x=0.5时，电导率在800 ℃达到最大值为1.26×10-2 S/cm。该电导增强机理为氧空位缺陷增强电导机理。
Abstract:
The Al-doped La9.33Si6-xAlxO26-0.5x （LSAO，x=0.0，0.5，1.0，1.5，2.0） solid electrolyte powders were successfully prepared at 600 ℃ within 5-7 minutes by combustion method. The LSAO ceramics were prepared from the powder calcined at 800 ℃ for 12 h via pressing， molding and sintering in sequence. The analyses of X-ray diffraction，X-ray photoelectron spectroscopy，Fourier transform infrared spectroscopy and scanning electron microscopy confirm that the LSAOs prepared by combustion method possess high purity and typical P63/m apatite structure. The doped Al3+ ions replace Si4+ ions and form ［Si（Al）O4］ in tetrahedral ［SiO4］，generating the oxygen vacancy. The LSAO ceramics with the best sintering properties were obtained by sintering at 1 500 ℃ for 3 h. The electrochemical impedance spectrum shows that when x＜0.5，the conductivity of LSAO increases with the increase of x，and when x>0.5，the conductivity of LSAO decreases with the increase of x，which is attributed to the formation of oxygen vacancy by Al3+ doping，thus reducing the spatial resistance of oxygen ions transport and increasing the conductivity. However，excessive incorporation of Al3+ leads to the large reduction in interstitial oxygen concentration and the decrease in conductivity. When x=0.5，the maximum conductivity reaches 1.26×10-2 S/cm（t=800 ℃）. The mechanism of enhanced conductance is oxygen vacancy defects enhancement mechanism.

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备注/Memo

备注/Memo:
收稿日期：2020-10-09基金项目：国家自然科学基金（51374155，51242010）；湖北省科技支撑计划（2014BCB034）；武汉工程大学研究生教育创新基金（CX2020167）作者简介：姜　媛，硕士研究生。E-mail:1063204412@qq.com*通讯作者：黄志良，博士，教授。E-mail:hzl16455@126.com； 陈常连，博士，副教授。E-mail:cnsdqdccl@hotmail.com引文格式：姜媛，黄志良，陈常连，等. 铝掺杂磷灰石型硅酸镧电解质的电导机理［J］. 武汉工程大学学报，2022，44（1）：48-54.
更新日期/Last Update: 2022-03-01