Structure and magnetic properties of nonsuperconducting doped Co and Fe Bi/sub 2/Sr/sub 2/Cu/sub 1/minus//ital x/M//subx//O/sub /ital y// phases

Journal Article · Thu Jun 01 00:00:00 EDT 1989 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.39.11587· OSTI ID:5999109

Tarascon, J M; Miceli, P F; Barboux, P; Hwang, D M; Hull, G W; Giroud, M; Greene, L H; LePage, Y; McKinnon, W R; Tselepis, E; others, and

The structure and magnetic properties of the Bi/sub 2/Sr/sub 2/Cu/sub 1/minus//ital x//M/sub x/O/sub /ital y// (/ital M/=Co and Fe) materials were studied. The limits of solid solution formation are at /ital x/=0.5 for the Fe system and /ital x/=1 for the Co system. Crystals of the new Bi/sub 2/Sr/sub 2/CoO/sub /ital Y// phase were grown and the structure established by x-ray crystallography. The subcell is the same as that of the 10-K superconductor, Bi/sub 2/Sr/sub 2/CuO/sub /ital y//, but the superstructure is different, as it exhibits a commensurate modulation of periodicity 4 instead of 5. Extra oxygen is accommodated in the Bi layers, as in Bi/sub 2/Sr/sub 3/Fe/sub 2/O/sub /ital y//, and the structure of the Bi-O layers can be described as 50% rocksalt-type and 50% oxygen-deficient perovskite for /ital x/=1, but with disorder at the oxygen positions. The formal valence of Co in this compound is about 2.5+-0.2 as deduced from structural and chemical measurements, whereas Fe adopts the oxidation state +3 as deduced by M/umlt o/ssbauer measurements. Bi/sub 2/Sr/sub 2/CoO/sub /ital y// is an antiferromagnetic insulator with the spins lying within the CoO/sub 2/ sheets and the antiferromagnetic ordering temperature (/ital T//sub /ital N//) is sensitive to processing conditions and composition changes. The high anisotropy of the susceptibility suggests that Bi/sub 2/Sr/sub 2/CoO/sub /ital y// may be an Ising or /ital XY/ antiferromagnet.

• Research Organization: Bell Communications Research, Red Bank, New Jersey 07701(US); National Research Council of Canada, Ottawa, Canada K1A0R9; AT&T Bell Labs., Murray Hill, NJ (United States); National Institute of Standards and Technology, Gaithersburg, Maryland 20899
• OSTI ID: 5999109
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Vol. 39:16
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BISMUTH OXIDES
PHYSICAL PROPERTIES
COBALT ADDITIONS
VALENCE
COPPER OXIDES
IRON ADDITIONS
STRONTIUM OXIDES
ANISOTROPY
ANTIFERROMAGNETISM
CRYSTAL STRUCTURE
DOPED MATERIALS
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MOESSBAUER EFFECT
SOLID SOLUTIONS
X-RAY DIFFRACTION
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
BISMUTH COMPOUNDS
CHALCOGENIDES
COBALT ALLOYS
COHERENT SCATTERING
COPPER COMPOUNDS
DIFFRACTION
DISPERSIONS
IRON ALLOYS
MAGNETISM
MATERIALS
MIXTURES
OXIDES
OXYGEN COMPOUNDS
SCATTERING
SOLUTIONS
STRONTIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
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