Electrical and magnetic properties of Nb sub 2 O sub 5 minus. delta. crystallographic shear structures

Journal Article · Tue Oct 01 04:00:00 EDT 1991 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.44.6973· OSTI ID:5172267

Cava, R J; Batlogg, B; Krajewski, J J; Poulsen, H F; Gammel, P; Peck, Jr, W F; Rupp, Jr, L W ^[1]

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1. AT T Bell Laboratories, Murray Hill, New Jersey (USA)

The reduced niobium oxides Nb{sub 25}O{sub 62}, Nb{sub 47}O{sub 116}, Nb{sub 22}O{sub 54}, and Nb{sub 12}O{sub 29} have been prepared in pure polycrystalline form by a niobium-metal gettering technique. They are related to the high niobia parent structure through the action of cystallographic shear to accommodate oxygen deficiency in Nb{sub 2}O{sub 5{minus}{delta}}. Electrical conductivities increase with increasing reduction: Nb{sub 12}O{sub 29} is a metallic conductor down to 0.3 K. All show, surprisingly, Curie-Weiss behavior in the {chi}-vs-{ital T} curves, with Nb{sub 12}O{sub 29} ordering antiferromagnetically at 12 K.

• OSTI ID: 5172267
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 44:13; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ANTIFERROMAGNETISM
CHALCOGENIDES
CHEMICAL REACTIONS
CRYSTALS
CURIE-WEISS LAW
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
GETTERING
MAGNETISM
NIOBIUM COMPOUNDS
NIOBIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POLYCRYSTALS
REDUCTION
REFRACTORY METAL COMPOUNDS
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
TYPE-II SUPERCONDUCTORS
ULTRALOW TEMPERATURE