The study of cation substitution in transition-metal oxides provides fundamental information needed to understand such phenomena as high-Tc superconductivity and magnetic order in oxide materials. The solid solution La1-xBaxTiO3 (0.0 ≤ x ≤ 0.5) has been prepared by arc melting stoichiometric amounts of LaTiO3 and BaTiO3 under argon. Single-phase samples can be made for the stoichiometry range studied here. The polycrystalline samples have been characterized using electron microprobe, thermal gravimetric analysis, temperature- and field-dependent magnetization, and dc resistivity. The stoichiometries determined by microprobe agree well with the theoretical stoichiometries. LaTiO3 is a canted antiferromagnet which shows a net ferromagnetic ordering at 150 K. The ferromagnetic order is destroyed with the addition of 5 % BaTiO3. All of the La1-xBaxTiO3 (x > 0) samples exhibit temperature-independent magnetism in the high-temperature (160-300 K) range and paramagnetism in the low temperature (<50 K) region. The La1-xBaxTiO3 samples display poor metallic conductivity. In addition, several random samples display a sharp drop in resistivity which is reminiscent of PTCR thermistor behavior.
|Original language||English (US)|
|Number of pages||6|
|Journal||Chemistry of Materials|
|State||Published - 1993|
ASJC Scopus subject areas
- Materials Chemistry
- Materials Science(all)