The Co tracer self-diffusion coefficients in single crystals are nearly identical to those in polycrystalline Co 1-xO. Comparison with thermogravimetric and electrical conductivity measurements confirms that the defects responsible for Co diffusion in the range of temperature and p/sub O 2 of this investigation are singly ionized cobalt vacancies. Measurements on crystals having deviations between 0.002 and 0.008 at 1150☌ showed the diffusion coefficient to depend on p O2 as D = 9.74 x 10 -9 p/sub O 2//sup 1/(3.59)/ cm 2/s, where p/sub O 2/ varied between 10 -2.5 and 10 -0.25 atm. This activation energy is in agreement with measurements made in air, if proper compensation is made for the effect of variation in more » stoichiometry. Measurements at x = 0.005 in Co 1-xO showed the Co tracer self-diffusion coefficient to be D = 3.88 x 10 -4 exp (-31600 ± 2400/RT) cm 2/s between 10☌. The arc-transfer technique of crystal growth was found to produce crystal of Co 1-xO of essentially the same purity as the starting Co rod, and the quality was comparable to commercially available crystals grown by Verneuil process. Tracer self-diffusion coefficients were measured as functions of temperature and deviations from stoichiometry. NCAA Rico Industries Laser Engraved Billfold Wallet Purdue Boilermakers.
europhysical topical conference on lattice defects in ionic crystals, Canterbury, UK, Country of Publication: United States Language: English Subject: 36 MATERIALS SCIENCE COBALT 55 DIFFUSION ISOTOPE EFFECTS COBALT 60 COBALT OXIDES SORPTIVE PROPERTIES DEFECTS INTERSTITIALS POINT DEFECTS BETA DECAY RADIOISOTOPES BETA-MINUS DECAY RADIOISOTOPES BETA-PLUS DECAY RADIOISOTOPES CHALCOGENIDES COBALT COMPOUNDS COBALT ISOTOPES CRYSTAL DEFECTS CRYSTAL STRUCTURE HOURS LIVING RADIOISOTOPES INTERMEDIATE MASS NUCLEI INTERNAL CONVERSION RADIOISOTOPES ISOMERIC TRANSITION ISOTOPES ISOTOPES MINUTES LIVING RADIOISOTOPES NUCLEI ODD-EVEN NUCLEI ODD-ODD NUCLEI OXIDES OXYGEN COMPOUNDS RADIOISOTOPES SURFACE PROPERTIES TRANSITION ELEMENT COMPOUNDS YEARS LIVING RADIOISOTOPES 360204* - Ceramics, Cermets, & Refractories- Physical Properties 360202 - Ceramics, Cermets, & Refractories- Structure & Phase =. Shop Tervis at the Dining & Entertaining store, Using a PCLP fan with S&Ps. Authors: Peterson, N L Chen, W K Publication Date: Research Org.: Argonne National Lab., IL (USA) Sponsoring Org.: USDOE OSTI Identifier: 5872495 Report Number(s): CONF-7909101-1 DOE Contract Number: W-31-109-ENG-38 Resource Type: Conference Resource Relation: Conference: 3.
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