KNb1-xTixO3-固溶体的合成与表征

向军; 李莉萍

doi:10.11858/gywlxb.2003.03.005

KNb1-xTixO3-固溶体的合成与表征

doi: 10.11858/gywlxb.2003.03.005

向军^1,,
李莉萍²

1.
华东船舶工业学院数理系，江苏镇江 212003；
2.
吉林大学物理系，吉林长春 130023

详细信息

通讯作者:
向军

计量
- 文章访问数: 7364
- HTML全文浏览量: 471
- PDF下载量: 872
出版历程
- 收稿日期: 2002-09-03
- 修回日期: 2002-11-15
- 发布日期: 2003-09-05

Synthesis and Characterization of KNb1-xTixO3- Solid Solutions

XIANG Jun^1
,,
LI Li-Ping²

1.
Department of Mathematics and Physics, East China Shipbuilding Institute, Zhenjiang 212003, China;
2.
Department of Physics, Jilin University, Changchun 130023, China

More Information

Corresponding author: XIANG Jun

摘要

摘要: 利用高温高压法首次合成了KNb1-xTixO3-（x=0～0.4）系列固溶体，并使用X射线衍射、TG-DTA、Raman谱和交流阻抗谱等对样品的结构、热稳定性和导电性进行了表征。XRD结果表明，随掺杂量的增加，晶胞体积减小；Ti掺杂引起了固溶体结构的转变，x0.15的样品为正交钙钛矿结构，而x0.15的样品几乎为纯四方相结构。Raman谱和DTA结果显示，Ti掺杂使四方相区宽化，并且随掺杂量的增加，相变温度逐渐下降。阻抗谱测量表明，所有样品均以离子导电为主，其中KNb0.85Ti0.15O2.925的氧离子导电率最高，在800 ℃时达到5.610-3 Scm-1，在测量温度范围内，电导率可以拟合成两条直线，低温活化能小于高温活化能。
- KNb1-xTixO3- /
- 高温高压 /
- 氧离子导体 /
- 结构相变
Abstract: KNb1-xTixO3- (x=0～0.40) solid solutions were synthesized under high temperature and high pressure for the first time. The structural characteristics and ionic conductivity of KNb1-xTixO3- solid solutions were investigated by XRD, TG-DTA, Raman and impedance spectroscopy techniques. XRD results showed that Ti-doping resulted in structural transformation, the samples of x0.15 have orthorhombic perovskite structure, but the samples of x0.15 are single tetragonal phase. With the increase of doping amount, the cell volume decrease. The Raman spectra at different temperatures and DTA curve indicate that the structure of the solid solutions had been changed, Ti-doping broadens tetragonal phase zone, and curie temperature decrease with the increase of dopant content. The ionic conductivity of the samples measured by impedance spectroscopy shows that in all the samples the ions are main carriers. KNb0.85Ti0.15O2.925 has the highest conductivity of 5.610-3 Scm-1 at 800 ℃. A marked curvature at T=630 ℃ has been observed in the Arrhenius plot of the bulk conductivity. The activation energy below 630 ℃ is lower than that above 630 ℃, and the cause is discussed.
- KNb1-xTixO3- /
- high-temperature and high-pressure /
- oxide ionic conductor /
- structural transformation

HTML全文

参考文献(15)

Yamazoe N, Miura N. Prospect and Problems of Solid Electrolyte-Based Oxygenic Gas Sensors [J]. Solid State Ionics, 1996, 86-88(Part Ⅱ): 987-993.

Wahara H. Proton Conducting Ceramics and Their Applications [J]. Solid State Ionics, 1996, 86-88(Part Ⅰ): 9-15.

Zhang W D, Li J T, Gu P Y, et al. Temperature Programmed Decomposition of NO over Er2O3/Bi2O3 Catalysts [J]. Chem J Chinese Universities, 1998, 19(6): 961-963. (in Chinese)

张伟德, 李基涛, 古萍英, 等. NO在Er2O3/Bi2O3催化剂上的程序升温分解 [J]. 高等学校化学学报, 1998, 19(6): 961-963.

Minh N Q. Ceramics Fuel Cell [J]. J Am Ceram Soc, 1993, 76(3): 563-588.

Li G S, Xu X T, Feng S H. Investigations on Various Structural Types and Valence States in Cerium Containing Hydrothermal Systems [J]. Chem J Chinese Universities, 1997, 18(11): 1737-1741. (in Chinese)

李广社, 徐秀廷, 冯守华. 含Ce的水热体系中结构稳定性及变价现象 [J]. 高等学校化学学报, 1997, 18 (11): 1737-1741.

Li G S, Li L P, Wang M Q, et al. Hydrothermal Synthesis and Transport Property of Cubic KNb0. 77Ti0. 23O2. 77 [J]. Chem J Chinese Universities, 1999, 20(4): 511-514. (in Chinese)

李广社, 李莉萍, 汪敏强, 等. 立方相KNb0. 77Ti0. 23O2. 77的水热合成与输运性质研究 [J]. 高等学校化学学报, 1999, 20(4): 511-514.

Thangadurai V, Subbama G N, Skukla A K, et al. AM1-xAlxO3-x(A=Na or K; M=Nb or Ta): New Anion-Deficient Perovskite Oxides Exhibiting Oxide Ion Conduction [J]. Chem Mater, 1996, 8: 1302-1306.

Xiang J, Li L P. Transport Properties of KNb1-xMgxO3- Synthesized under High-Temperature and High-Pressure [J]. Chinese Journal of High Pressure Physics, 2001, 15(4): 297-303. (in Chinese)

向军, 李莉萍. KNb1-xMgxO3- 的高温高压合成及输运性质研究 [J]. 高压物理学报, 2001, 15(4): 297-303.

Zhong W L. Physics of Ferroelectrics [M]. Beijing: Science Press, 1996. 159-161. (in Chinese)

钟维烈. 铁电体物理学 [M]. 北京: 科学出版社, 1996. 159-161.

Marssi M E, Farhi R, Dai X, et al. A Raman Scattering Study of the Ferroelectric Ordering in Rhombohedral and Tetragonal La-Modified Lead Zirconate Titanate Ceramics [J]. J Appl Phys, 1996, 80: 1079-1084.

施引文献

资源附件(0)

访问统计