Hydrothermal synthesis of perovskite and pyrochlore powders of potassium tantalate

被引：68
作者：
Goh, GKL
Haile, SM
Levi, CG
Lange, FF
机构：
[1] Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA
[2] Univ Calif Santa Barbara, Mat Res Lab, Santa Barbara, CA 93106 USA
[3] CALTECH, Mat Sci Dept 13878, Pasadena, CA 91125 USA
来源：
JOURNAL OF MATERIALS RESEARCH | 2002年 / 17卷 / 12期
基金：
美国国家科学基金会;
关键词：
D O I：
10.1557/JMR.2002.0458
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Potassium tantalate powders were hydrothermally synthesized at 100 to 200 degreesC in 4 to 15 M aqueous KOH solutions. A defect pyrochlore, KTa2O5(OH) . nH(2)O (n approximate to 1.4), was obtained at 4 M KOH, but at 7-12 M KOH, this pyrochlore was gradually replaced by a defect perovskite as the stable phase. At 15 M KOH, there was, no intermediate pyrochlore only a defect perovskite, K0.85Ta0.92O2.43(OH)(0.57) . 0.15H(2)O. Synthesis at higher KOH concentrations led to greater incorporation of protons in the perovskite structures. The potassium vacancies required for charge compensation of incorporated protons could accommodate water molecules in the perovskite structure.
引用
收藏
页码：3168 / 3176
页数：9
相关论文
共 33 条
  • [1] ON THE CORRELATION BETWEEN THE H-1-NMR CHEMICAL-SHIFT AND THE STRETCHING VIBRATION FREQUENCY OF HYDROXYL-GROUPS IN SOLIDS
    BRUNNER, E
    KARGE, HG
    PFEIFER, H
    [J]. ZEITSCHRIFT FUR PHYSIKALISCHE CHEMIE-INTERNATIONAL JOURNAL OF RESEARCH IN PHYSICAL CHEMISTRY & CHEMICAL PHYSICS, 1992, 176 : 173 - 183
  • [2] NMR-STUDY OF PROTON MOTION IN THE DEFECT PYROCHLORES HTAWO6 AND HTAWO6.H2O
    BUTLER, MA
    BIEFELD, RM
    [J]. PHYSICAL REVIEW B, 1979, 19 (11): : 5455 - 5462
  • [3] LOW-TEMPERATURE LOW-PRESSURE HYDROTHERMAL SYNTHESIS OF BARIUM-TITANATE - POWDER AND HETEROEPITAXIAL THIN-FILMS
    CHIEN, AT
    SPECK, JS
    LANGE, FF
    DAYKIN, AC
    LEVI, CG
    [J]. JOURNAL OF MATERIALS RESEARCH, 1995, 10 (07) : 1784 - 1789
  • [4] Electrical characterization of BaTiO3 heteroepitaxial thin films by hydrothermal synthesis
    Chien, AT
    Xu, X
    Kim, JH
    Sachleben, J
    Speck, JS
    Lange, FF
    [J]. JOURNAL OF MATERIALS RESEARCH, 1999, 14 (08) : 3330 - 3339
  • [5] Hydrothermal synthesis of heteroepitaxial Pb(ZrxTi1-x)O-3 thin films at 90-150 degrees C
    Chien, AT
    Speck, JS
    Lange, FF
    [J]. JOURNAL OF MATERIALS RESEARCH, 1997, 12 (05) : 1176 - 1178
  • [6] The growth and properties of epitaxial KNbO3 thin films and KNbO3/KTaO3 superlattices
    Christen, HM
    Boatner, LA
    Budai, JD
    Chisholm, MF
    Gea, LA
    Marrero, PJ
    Norton, DP
    [J]. APPLIED PHYSICS LETTERS, 1996, 68 (11) : 1488 - 1490
  • [7] STRUCTURE AND PROTON MOBILITY IN THE DEFECT PYROCHLORE (H2O)XH2TA2O6
    DICKENS, PG
    WELLER, MT
    [J]. SOLID STATE COMMUNICATIONS, 1986, 59 (08) : 569 - 573
  • [8] Hydrothermal synthesis and structure of a potassium tantalum defect pyrochlore
    Duan, NG
    Tian, ZR
    Willis, WS
    Suib, SL
    Newsam, JM
    Levine, SM
    [J]. INORGANIC CHEMISTRY, 1998, 37 (18) : 4697 - 4701
  • [9] STUDY OF PROTONS IN ACCEPTOR-DOPED KTAO3 CRYSTALS BY IR AND EPR TECHNIQUES
    FU, SQ
    LEE, WK
    NOWICK, AS
    BOATNER, LA
    ABRAHAM, MM
    [J]. JOURNAL OF SOLID STATE CHEMISTRY, 1989, 83 (02) : 221 - 229
  • [10] GOH GKL, IN PRESS J MAT RES
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