SYNTHESIS, STRUCTURE AND CHARACTERIZATION OF CE1-XAXTIO3 (0.0 LESS-THAN-OR-EQUAL-TO X LESS-THAN-OR-EQUAL-TO 0.8, A = SR, BA)

被引:24
作者
SUNSTROM, JE
KAUZLARICH, SM
ANTONIO, MR
机构
[1] UNIV CALIF DAVIS,DEPT CHEM,DAVIS,CA 95616
[2] BP RES,CLEVELAND,OH 44128
关键词
D O I
10.1021/cm00026a006
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The investigation of the solid solution Ce1-xAxTiO3 (A = Sr, Ba) was undertaken with the aim to understand the magnetic and electronic properties as a function of alkaline earth doping. The solid solutions Ce1-xAxTiO3 (A = Sr, Ba; 0.0 less-than-or-equal-to x less-than-or-equal-to 0.8) have been prepared by arc melting stoichiometric amounts of CeTiO3 and ATiO3 under argon. Single-phase samples of Ce1-xSrxTiO3 can be made for the entire stoichiometry range. However, there is phase separation in samples of Ce1-xBaxTiO3 for high values of x. The polycrystalline samples have been characterized using microprobe, thermal gravimetric analysis, powder X-ray diffraction, Ce L-edge X-ray absorption fine structure, temperature- and field-dependent magnetization, and dc electrical resistivity. The Ce1-xSrxTiO3 samples crystallize in the orthorhombic space groups Pbnm (x less-than-or-equal-to 0.4) and Ibmm (0.4 < x less-than-or-equal-to 0.8). The Ce1-xBaxTiO3 Samples crystallize in the orthorhombic space groups Pbnm (x less-than-or-equal-to 0.2) and Ibmm (0.2 < x less-than-or-equal-to 0.6). The Ce0.2Ba0.8TiO3 Sample is biphasic containing an orthorhombic phase (Ibmm) and a hexagonal BaTiO3-x phase. Ce XANES (X-ray absorption near-edge structure) data show that in all samples the Ce valence is 3+. The samples Ce1-xSrxTiO3 (x = 0.0, 0.2) exhibit a ferromagnetic component below 135 K due to coupling between Ce and Ti moments. The temperature dependent resistivity measurement on polycrystalline CeTiO3 shows it to be a small gap (0.005 eV) semiconductor. The Ce1-xSrxTiO3 samples are metallic up to x = 0.8 while the Ce1-xBaxTiO3 samples are metallic for x = 0.2, 0.4.
引用
收藏
页码:182 / 191
页数:10
相关论文
共 81 条
  • [1] SOFT-X-RAY-ABSORPTION STUDIES OF THE LOCATION OF EXTRA CHARGES INDUCED BY SUBSTITUTION IN CONTROLLED-VALENCE MATERIALS
    ABBATE, M
    DEGROOT, FMF
    FUGGLE, JC
    FUJIMORI, A
    TOKURA, Y
    FUJISHIMA, Y
    STREBEL, O
    DOMKE, M
    KAINDL, G
    VANELP, J
    THOLE, BT
    SAWATZKY, GA
    SACCHI, M
    TSUDA, N
    [J]. PHYSICAL REVIEW B, 1991, 44 (11): : 5419 - 5422
  • [2] STRUCTURAL ENVIRONMENTS AND OXIDATION-STATES OF METAL-CATIONS IN BISMUTH CERIUM MOLYBDATE SOLID-SOLUTIONS BY X-RAY ABSORPTION-SPECTROSCOPY
    ANTONIO, MR
    BRAZDIL, JF
    GLAESER, LC
    MEHICIC, M
    TELLER, RG
    [J]. JOURNAL OF PHYSICAL CHEMISTRY, 1988, 92 (08) : 2338 - 2345
  • [3] COORDINATION AND VALENCE OF NIOBIUM IN TIO2 NBO2 SOLID-SOLUTIONS THROUGH X-RAY ABSORPTION-SPECTROSCOPY
    ANTONIO, MR
    SONG, I
    YAMADA, H
    [J]. JOURNAL OF SOLID STATE CHEMISTRY, 1991, 93 (01) : 183 - 192
  • [4] BARNIGHAUSEN H, 1975, ACTA CRYSTALLOGR A S, V3, P31
  • [5] Bauchspiess K. R., 1981, Valence Fluctuations in Solids. International Conference on Valence Fluctuations in Solids, P417
  • [6] BAZUEV GV, 1977, ZH NEORG KHIM+, V22, P1239
  • [7] BAZUEV GV, 1978, ZH NEORG KHIM+, V23, P1451
  • [8] BAZUEV GV, 1975, FIZ TVERD TELA, V11, P3453
  • [9] BAZUEV GV, 1983, IAN SSSR NEORG MATER, V19, P108
  • [10] BAZUEV GV, 1978, IAN SSSR NEORG MATER, V14, P267