Synthesis, crystal structure, and properties of metallic PrNiO sub 3 : Comparison with metallic NdNiO sub 3 and semiconducting SmNiO sub 3

Journal Article · Mon Apr 01 00:00:00 EST 1991 · Journal of Solid State Chemistry; (USA)

DOI:https://doi.org/10.1016/0022-4596(91)90077-U· OSTI ID:5621717

Lacorre, P; Torrance, J B; Nazzal, A I; Wang, P W; Huang, T C ^[1]; Pannetier, J ^[2]

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1. IBM Research Div., San Jose, CA (USA)
2. Institut Laue Langevin, Grenoble (France)

The compound PrNiO{sub 3} has been prepared for the first time. Using only moderate oxygen pressure, PrNiO{sub 3}, NdNiO{sub 3}, and SmNiO{sub 3} were made and found to crystallize in the GdFeO{sub 3}-type orthorhombically distorted perovskite structure. Structural refinements for all three compounds reveal NiO{sub 6} octahedra with an average Ni-O distance of 1.94-1.95 {angstrom}, about the same as in the more distorted HoNiO{sub 3}. The electrical conductivity of PrNiO{sub 3} is metallic at room temperature, but undergoes a transition at 130 K to an insulating state. Examination of the conductivities of the corresponding Sm, Nd, and La compounds reveals a monotonic pattern of behavior: as the rare earth radius is increased, the compounds become more conducting because the metal-insulator transition temperature decreases from 400 K(Sm) to 200 K(Nd) to 130 K(Pr) to none for La. from DSC and lattice constant measurements, this transition is shown to be first order, with a {approximately}O.2% contraction upon heating into the metallic state. Low temperature neutron measurements in the insulating phase reveal new diffraction peaks, probably related to magnetic ordering of Ni and/or RE moments.

• OSTI ID: 5621717
• Journal Information: Journal of Solid State Chemistry; (USA), Vol. 91:2; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
NEODYMIUM OXIDES
CHEMICAL PREPARATION
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
NICKEL OXIDES
PRASEODYMIUM OXIDES
SAMARIUM OXIDES
EXPERIMENTAL DATA
LATTICE PARAMETERS
NEUTRON DIFFRACTION
ORTHORHOMBIC LATTICES
X-RAY DIFFRACTION
CHALCOGENIDES
COHERENT SCATTERING
CRYSTAL LATTICES
DATA
DIFFRACTION
ELECTRICAL PROPERTIES
INFORMATION
NEODYMIUM COMPOUNDS
NICKEL COMPOUNDS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PRASEODYMIUM COMPOUNDS
RARE EARTH COMPOUNDS
SAMARIUM COMPOUNDS
SCATTERING
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
360201* - Ceramics
Cermets
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360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies
360204 - Ceramics
Cermets
& Refractories- Physical Properties