Synthesis, structure, and characteization of Ce1-xAxTiO3 (0.0 ≤ x ≤ 0.8; a = Sr, Ba)

Joseph E. Sunstrom IV, Susan M. Kauzlarich, Mark R. Antonio

Research output: Contribution to journalArticle

24 Scopus citations

Abstract

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 ≤ x ≤ 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 ≤ 0.4) and Ibmm (0.4 ≤ x ≤ 0.8). The Ce1-xBaxTiO3 samples crystallize in the orthorhombic space groups Pbnm (x ≤ 0.2) and Ibmm (0.2 ≤ x ≤ 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.

Original languageEnglish (US)
Pages (from-to)182-191
Number of pages10
JournalChemistry of Materials
Volume5
Issue number2
StatePublished - 1993

ASJC Scopus subject areas

  • Materials Chemistry
  • Materials Science(all)

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    Sunstrom IV, J. E., Kauzlarich, S. M., & Antonio, M. R. (1993). Synthesis, structure, and characteization of Ce1-xAxTiO3 (0.0 ≤ x ≤ 0.8; a = Sr, Ba). Chemistry of Materials, 5(2), 182-191.