Crystal chemistry and transport properties of Nd sub 2-x A sub x NiO sub 4 (A = Ca, Sr, or Ba, 0 le x le 1. 4)

Journal Article · Wed Jan 01 04:00:00 EST 1992 · Journal of Solid State Chemistry; (United States)

DOI:https://doi.org/10.1016/S0022-4596(05)80299-3· OSTI ID:7200883

Takeda, Y; Nishijima, M; Imanishi, N; Kanno, R; Yamamoto, O ^[1]; Takano, M ^[2]

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1. Mie Univ., Tsu (Japan)
2. Kyoto Univ., Uji (Japan)

Structural and electrical properties of the system crystallizing in the K{sub 2}NiF{sub 4} structure, Nd{sub 2{minus}x}A{sub x}NiO{sub 4} (A = Ca, Sr, or Ba, 0{le}x{le}1.4), were studied. The solid solution limits of alkaline earth were 0.6, 1.4, and 0.6 for Ca, Sr, and Ba, respectively. Oxygen content was controlled by annealing under various oxygen pressures below 150 atm. Powder X-ray diffraction data were analyzed by the Rietveld method to determine the bond lengths. In the case of the Sr-substituted system, tetragonality in the lattice parameters, c/a, shows a maximum at x = 0.6, while distortion of a NiO{sub 6} octahedron, Ni-O(2) (//c-axia)/Ni-O(1) (//a-axis), monotonically decreases from 1.13 (x = 0) to 1.04 (x = 1.4). No Jahn-Teller distortion appears in a Ni{sup 3+} region. A metal-semiconductor transition is observed for 0{lt}x{lt}1.0, the transition temperature decreasing from 450 K (x = 0.1) to 100 K (x = 1.0), but it exhibits a change in character at x = 0.6 where the sign of the Seebeck coefficient also changes.

• OSTI ID: 7200883
• Journal Information: Journal of Solid State Chemistry; (United States), Journal Name: Journal of Solid State Chemistry; (United States) Vol. 96:1; ISSN JSSCB; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKALINE EARTH METAL COMPOUNDS
ANNEALING
BARIUM COMPOUNDS
BARIUM OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
CHEMICAL PREPARATION
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DATA
DIFFRACTION
DISPERSIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
EXPERIMENTAL DATA
HEAT TREATMENTS
HIGH PRESSURE
INFORMATION
LATTICE PARAMETERS
MATERIALS
MEDIUM PRESSURE
MIXTURES
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
NICKEL COMPOUNDS
NICKEL OXIDES
NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POWDERS
PRESSURE EFFECTS
RARE EARTH COMPOUNDS
SCATTERING
SEMICONDUCTOR MATERIALS
SOLID SOLUTIONS
SOLUTIONS
STOICHIOMETRY
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SYNTHESIS
TEMPERATURE RANGE
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
TETRAGONAL LATTICES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
X-RAY DIFFRACTION