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[1]陈小卫,许飞,殷仕龙,等.织构化Mg掺杂磷灰石型硅酸镧电解质制备、结构及O2-导电性能[J].南京工业大学学报(自然科学版),2014,36(05):18-23.[doi:10.3969/j.issn.1671-7627.2014.05.004]
 CHEN Xiaowei,XU Fei,YIN Shilong,et al.Preparation of Mg-doped apatite-type lanthanum silicate electrolyte with textured structure and its oxide ions electrical conductivity[J].Journal of NANJING TECH UNIVERSITY(NATURAL SCIENCE EDITION),2014,36(05):18-23.[doi:10.3969/j.issn.1671-7627.2014.05.004]
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织构化Mg掺杂磷灰石型硅酸镧电解质制备、结构及O2-导电性能()
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《南京工业大学学报(自然科学版)》[ISSN:1671-7627/CN:32-1670/N]

卷:
36
期数:
2014年05期
页码:
18-23
栏目:
出版日期:
2014-09-30

文章信息/Info

Title:
Preparation of Mg-doped apatite-type lanthanum silicate electrolyte with textured structure and its oxide ions electrical conductivity
文章编号:
1671-7627(2014)05-0018-06
作者:
陈小卫许飞殷仕龙李传明汪镇涛曾燕伟
南京工业大学 材料科学与工程学院,江苏 南京 210009
Author(s):
CHEN XiaoweiXU FeiYIN ShilongLI ChuanmingWANG ZhentaoZENG Yanwei
College of Materials Science and Engineering,Nanjing Tech University,Nanjing 210009,China
关键词:
硅酸镧 高织构 掺杂 电导率
Keywords:
lanthanum silicate high texture doping electrical conductivity
分类号:
O482;O614
DOI:
10.3969/j.issn.1671-7627.2014.05.004
文献标志码:
A
摘要:
以La2O3和SiO2为原料,首先利用固相法合成La2Si2O7和La2SiO5粉体,然后采用共压法成型得到La2Si2O7(含MgO、La2O3)/La2SiO5/La2Si2O7(含MgO、La2O3)三明治结构,进而在高温下通过互扩散反应制备织构化Mg掺杂硅酸镧电解质(La9.33Si5.8Mg0.2O25.8)。以X线衍射仪(XRD)、场发射扫描电子显微镜(FESEM)、能量色散X线谱(EDS)、交流阻抗等测试与表征手段研究合成粉体物相和Mg掺杂硅酸镧电解质的微结构及其O2-导电性能。结果表明:通过高温互扩散和固相反应过程,可制得单相织构化Mg掺杂硅酸镧电解质,其晶粒c轴沿样品厚度方向织构化程度达70%。同时,XRD、拉曼光谱和EDS能谱分析表明:掺杂Mg主要占据结构中Si位; 织构化的Mg掺杂硅酸镧电解质在750 ℃下电导率达3.81×10-3 S/cm、活化能为0.71 eV。
Abstract:
The La2O3 and SiO2 were used to synthesize La2Si2O7 and La2SiO5 as precursor powders via solid reaction process.The three-layered pellets with La2SiO5 symmetrical sandwiched between two layers of La2Si2O7(mixed with MgO and La2O3)were die-pressed,and then reactively sintered through diffusions at high temperature to prepare textured lanthanum silicate electrolyte doped with Mg(La9.33Si5.8Mg0.2O25.8,Mg-LSO).The X-ray diffraction(XRD),field-emission scaning electron microscopy(FESEM), energy-dispersive spectrometer(EDS)and alternating current(AC)impedance spectroscopy were employed to characterize the phase composition of synthesized precursor powders and the microstructure and oxide ions conductivity of sintered Mg-LSO.Results showed that a single-phase and textured Mg-LSO electrolyte could be successfully prepared by means of inter-diffusions under the present conditions.The sample was determined to have a crystal grain preferential orientation degree of 70% with the c axis parallel to the direction of its thickness.The XRD,Raman and EDS spectra revealed that the Mg2+ ions mainly occupied the Si2+ sites in the lattice of Mg-doped LSO.As a result,the electrolyte was found to have an oxide conductivity of 3.81×10-3 S/cm at 750 ℃ with an activation energy of 0.71 eV.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期:2013-12-28
作者简介:陈小卫(1987—),男,江苏大丰人,硕士生,主要研究方向为固体氧化物燃料电池及电化学; 曾燕伟(联系人),教授,E-mail:stephen_zeng@njtech.edu.cn..
更新日期/Last Update: 2014-09-20