Unusual metal-insulator transitions in the LaTi{sub 1}-{sub x}V{sub x}O{sub 3} perovskite phases
- Univ. of Maryland, College Park, MD (United States); and others
A series of LaTi{sub 1-x}V{sub x}O{sub 3} compounds (0 {le}x{le}1) have been prepared by the dc arc-melting method and characterized by conventional powder X-ray diffraction, thermogravimetric analysis, four probe resistivity, and magnetic susceptibility studies. Selected members of this series have been characterized by synchrotron X-ray diffraction, neutron diffraction, selected area electron diffraction. Samples in the 0.2 {le} x {le}0.3 region are {approx} 3-4% La deficient (e.g., La{sub 0.97}Ti{sub 0.8}V{sub 0.2}O{sub 3}). Like the LaMO{sub 3} end members where M=Ti, V, and the LaTi{sub 1-x}V{sub x}O{sub 3} phases are barely orthorhombic (almost tetragonal) and adopt the perovskite-type GdFeO{sub 3} structure (space group Pnma). Most of the LaTi{sub 1-x}V{sub x}O{sub 3} phases are antiferromagnetic (AF) insulators including LaTiO{sub 3} (T{sub N}=148 K) and LaVO{sub 3} (T{sub N}= 140 K). For the LaTi{sub 1-x}V{sub x}O{sub 3} phases in the 0, x, 0.10 region, the AF ordering temperature and resistivities are reduced with increasing vanadium concentration. The 0.10 {le}x {le} 0.25 region comprises poorly metallic (p298 {approx} 10{sup -2} {Omega} cm), paramagnetic phases that represent rare samples of B-site-substituted metallic perovskites. 57 refs., 17 figs., 3 tabs.
- OSTI ID:
- 369906
- Journal Information:
- Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 2 Vol. 8; ISSN CMATEX; ISSN 0897-4756
- Country of Publication:
- United States
- Language:
- English
Similar Records
Synthesis and characterization of LaTi sub 1-x Cu sub x O sub 3 compounds
Metal - insulator transitions in La{sub 1-x}TiO{sub 3}, 0.0 {le} x {le} 0.33. Structure - property correlations
Chemical reactions and dielectric properties of the BaTiO{sub 3}-LaAlO{sub 3} and BaTiO{sub 3}-LaAlO{sub 3}-LaTi{sub 3/4}O{sub 3} systems
Journal Article
·
Fri Nov 30 23:00:00 EST 1990
· Journal of Solid State Chemistry; (USA)
·
OSTI ID:6117749
Metal - insulator transitions in La{sub 1-x}TiO{sub 3}, 0.0 {le} x {le} 0.33. Structure - property correlations
Journal Article
·
Mon Oct 31 23:00:00 EST 1994
· Chemistry of Materials
·
OSTI ID:98754
Chemical reactions and dielectric properties of the BaTiO{sub 3}-LaAlO{sub 3} and BaTiO{sub 3}-LaAlO{sub 3}-LaTi{sub 3/4}O{sub 3} systems
Journal Article
·
Fri Feb 28 23:00:00 EST 1997
· Journal of Solid State Chemistry
·
OSTI ID:569202