Synthesis, structure, and characterization of Ce[sub 1[minus]x]A[sub x]TiO[sub 3] (0. 0 [le] x [le] 0. 8; A = Sr, Ba)

Journal Article · Sun Jan 31 23:00:00 EST 1993 · Chemistry of Materials; (United States)

DOI:https://doi.org/10.1021/cm00026a006· OSTI ID:7073592

Sunstrom, IV, J E; Kauzlarich, S M ^[1]; Antonio, M R ^[2]

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1. Univ. of California, Davis (United States)
2. BP Research, Cleveland, OH (United States)

The investigation of the solid solution Ce[sub 1[minus]x]A[sub x]TiO[sub 3] (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 Ce[sub 1[minus]x]A[sub x]TiO[sub 3] (A = Sr, Ba; 0.0 [le] x [le] 0.8) have been prepared by arc melting stoichiometric amounts of CeTiO[sub 3] and ATiO[sub 3] argon. Single-phase samples of Ce[sub 1[minus]x]Sr[sub x]TiO[sub 3] can be made for the entire stoichiometry range. However, there is phase separation in samples of Ce[sub 1[minus]x]Ba[sub x]TiO[sub 3] 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 Ce[sub 1[minus]x]Sr[sub x]TiO[sub 3] samples crystallize in the orthorhombic space groups Pbnm (x [le] 0.4) and Ibmm (0.4 < x [le] 0.8). The Ce[sub 1[minus]x]Ba[sub x]TiO[sub 3] samples crystallize in the orthorhombic space groups Pbnm (x [le] 0.2) and Ibmm (0.2 < x [le] 0.6). The Ce[sub 0.2]Ba[sub 0.8]TiO[sub 3] sample is biphasic containing an orthorhombic phase (Ibmm) and a hexagonal BaTiO[sub 3[minus]x] phase. Ce XANES (X-ray absorption near-edge structure) data show that in all samples the Ce valence is 3+. The samples Ce[sub 1[minus]x]Sr[sub x]TiO[sub 3] ( 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 CeTiO[sub 3] shows it to be a small gap (0.005 eV) semiconductor. The Ce[sub 1[minus]x]Sr[sub x]TiO[sub c] samples are metallic up to x = 0.8 while the Ce[sub 1[minus]x]Ba[sub x]TiO[sub 3] samples are metallic for x = 0.2, 0.4. 49 refs., 10 figs., 2 tabs.

• OSTI ID: 7073592
• Journal Information: Chemistry of Materials; (United States), Journal Name: Chemistry of Materials; (United States) Vol. 5:2; ISSN CMATEX; ISSN 0897-4756
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
&amp; Refractories-- Structure &amp; Phase Studies
360204 -- Ceramics
Cermets
&amp; Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL PREPARATION
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DIFFRACTION
DISPERSIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
GRAVIMETRIC ANALYSIS
MATERIALS
MICROSCOPY
MIXTURES
ORTHORHOMBIC LATTICES
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PHYSICAL PROPERTIES
QUANTITATIVE CHEMICAL ANALYSIS
RARE EARTH COMPOUNDS
SCATTERING
SEMICONDUCTOR MATERIALS
SOLID SOLUTIONS
SOLUTIONS
SPECTROSCOPY
STOICHIOMETRY
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SYNTHESIS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0000-0013 K
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY