Structure and properties of Tl2Nb2O6+x phases with the pyrochlore structure

被引：10
|
作者：
Uma, S
Kodialam, S
Yokochi, A
Khosrovani, N
Subramanian, MA
Sleight, AW
机构：
[1] Oregon State Univ, Dept Chem, Corvallis, OR 97331 USA
[2] Dupont Co, Cent Res & Dev, Expt Stn, Wilmington, DE 19880 USA
来源：
JOURNAL OF SOLID STATE CHEMISTRY | 2000年 / 155卷 / 01期
基金：
美国国家科学基金会;
关键词：
thallium niobate; structure; composition;
D O I：
10.1006/jssc.2000.8937
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
Phases with the cubic pyrochlore structure and the composition Tl2Nb2O6+x were prepared under various oxygen pressures. Rietveld refinements of neutron powder diffraction data showed 10.674 Angstrom for x = 0.11, a = 10.637 Angstrom for x = 0,44, and a = 10.627 Angstrom for x = 0.64. Reflections forbidden by spherical atoms in ideal positions are observed at x = 0.11, and these can be attributed to an anisotropic thermal displacement parameter for Tl. Despite the Tl(I)/Tl(III) mixed valency, these phases show a high electrical resistivity. (C) 2000 Academic Press.
引用
收藏
页码：225 / 228
页数：4
相关论文
共 50 条
  • [41] STRUCTURE AND PROTON MOBILITY IN THE DEFECT PYROCHLORE (H2O)XH2TA2O6
    DICKENS, PG
    WELLER, MT
    SOLID STATE COMMUNICATIONS, 1986, 59 (08) : 569 - 573
  • [42] Synthesis and transport properties of substituted Tl2Mn2O7 pyrochlore
    Cheihk-Rouhou, W
    Strobel, P
    Chaillout, C
    Loureiro, SM
    Senis, R
    Martinez, B
    Obradors, X
    Pierre, J
    JOURNAL OF MATERIALS CHEMISTRY, 1999, 9 (03) : 743 - 748
  • [43] RAMAN EFFECT IN CD2NB2O7 FERROELECTRIC CRYSTAL AND OTHER CRYSTALS WITH PYROCHLORE STRUCTURE
    PISAREV, RV
    SINII, IG
    KUZMINOV, EG
    MYLNIKOVA, IE
    IZVESTIYA AKADEMII NAUK SSSR SERIYA FIZICHESKAYA, 1977, 41 (03): : 588 - 591
  • [44] New compounds based on pyrochlore structure:: R2Nb2O7 (R = Dy, Yb)
    Sakai, O
    Jana, Y
    Higashinaka, R
    Fukazawa, H
    Nakatsuji, S
    Maeno, Y
    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 2004, 73 (10) : 2829 - 2833
  • [45] Phase transformation and phase distribution of pyrochlore structure in Bi2O3-ZnO-Nb2O5 system
    Wang, H
    Wang, XL
    Yao, X
    ISAF '96 - PROCEEDINGS OF THE TENTH IEEE INTERNATIONAL SYMPOSIUM ON APPLICATIONS OF FERROELECTRICS, VOLS 1 AND 2, 1996, : 787 - 790
  • [46] ALKALI BISMUTH NIOBATES, RbBi2Nb5O16 AND CsBi2Nb5O16, WITH A PYROCHLORE STRUCTURE.
    Sugai, Tokuko
    1600, (25):
  • [47] X-RAY STRUCTURE ANALYSES OF THALLIUM POLYBORATE HYDRATES .2. THE STRUCTURE OF TL[B5O6(OH)4].2H2O
    WOLLER, KH
    HELLER, G
    ZEITSCHRIFT FUR KRISTALLOGRAPHIE, 1981, 156 (1-2): : 159 - 166
  • [48] Structure and dielectric properties of Bi6-x Sr x Ti2-x Nb2+x O18 (x=0-2) solid solutions
    Vlasenko, V. G.
    Zubkov, S. V.
    Shuvaeva, V. A.
    PHYSICS OF THE SOLID STATE, 2013, 55 (01) : 101 - 104
  • [49] Effect of La2O3 substitutions on structure and dielectric properties of Bi2O3–ZnO–Nb2O5-based pyrochlore ceramics
    Hong Wang
    Desheng Zhang
    Xiaoli Wang
    Xi Yao
    Journal of Materials Research, 1999, 14 : 546 - 548
  • [50] The structure and electrical properties of lithium doped pyrochlore Gd2Zr2O7
    Anokhina, I. A.
    Animitsa, I. E.
    Voronin, V., I
    Vykhodets, V. B.
    Kurennykh, T. E.
    Molchanova, N. G.
    Vylkov, A., I
    Dedyukhin, A. E.
    Zaikov, Y. P.
    CERAMICS INTERNATIONAL, 2021, 47 (02) : 1949 - 1961
12345