Ultrafine BaPb/sub 1-x/Bi/sub x/O/sub 3/ powders prepared by the spray-ICP technique

Journal Article · Mon Jun 01 00:00:00 EDT 1987 · Plasma Chem. Plasma Process.; (United States)

DOI:https://doi.org/10.1007/BF01019178· OSTI ID:6418206

Ono, T; Kagawa, M; Syono, Y; Ikebe, M; Muto, Y

Ultrafine powders of a ternary oxide system, Ba-Pb-Bi-O, were prepared by spraying aqueous mixed solutions of Ba(NO/sub 3/)/sub 2/, Pb(NO/sub 3/)/sub 2/, and Bi(NO/sub 3/)/sub 3/ into an argon inductively coupled plasma of ultrahigh temperature above 5000 K (the spray-ICP technique). Phases of the powders were largely dependent on the powder collectors enclosing the tail flame and its successive gas flow. In the water-cooled collector, mixtures of amorphous and crystalline materials were formed. In the collector where the gas flow was spontaneously maintained at about 550/sup 0/C by ICP itself, ultrafine BaPb/sub 1-x/Bi/sub x/O/sub 3/ (BPBO) 10-40 nm in particle diameter was obtained. The BPBO thus obtained had a few wt.% of water and carbonate. They were lost by heat treatment up to 550/sup 0/C, and a single-phase BPBO was formed. The as-prepared BPBO (x = 0.25) showed no superconducting transition down to 1.5 K, but the one having a particle diameter of approx. 1 ..mu..m formed by heating the as-prepared BPBO up to 1000/sup 0/C had a superconducting transition temperature at 11.3 K.

• Research Organization: Tohoku Univ., Sendai, Japan
• OSTI ID: 6418206
• Journal Information: Plasma Chem. Plasma Process.; (United States), Vol. 7:2
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
PLASMA ARC SPRAYING
SUPERCONDUCTIVITY
BISMUTH OXIDES
LEAD OXIDES
SUPERCONDUCTORS
FABRICATION
ARGON
BARIUM NITRATES
BISMUTH NITRATES
HEAT TREATMENTS
INFRARED SPECTRA
LATTICE PARAMETERS
LEAD NITRATES
PARTICLE SIZE
PLASMA
POWDER METALLURGY
POWDERS
PYROLYSIS
PYROMETALLURGY
THERMAL GRAVIMETRIC ANALYSIS
TRANSITION TEMPERATURE
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BISMUTH COMPOUNDS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
COHERENT SCATTERING
DECOMPOSITION
DEPOSITION
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON MICROSCOPY
ELEMENTS
EXTRACTIVE METALLURGY
FLUIDS
GASES
GRAVIMETRIC ANALYSIS
LEAD COMPOUNDS
METALLURGY
MICROSCOPY
NITRATES
NITROGEN COMPOUNDS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
QUANTITATIVE CHEMICAL ANALYSIS
RARE GASES
SCATTERING
SIZE
SPECTRA
SPRAY COATING
SURFACE COATING
THERMAL ANALYSIS
THERMOCHEMICAL PROCESSES
THERMODYNAMIC PROPERTIES
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication
360204 - Ceramics
Cermets
& Refractories- Physical Properties