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Carbon Content of High‐Purity Alkaline Earth Oxide Single Crystals Grown by Arc Fusion
Author(s) -
FREUND F.,
DEBRAS G.,
DEMORTIER G.
Publication year - 1978
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1978.tb09353.x
Subject(s) - carbon fibers , materials science , oxide , deuterium , fusion , analytical chemistry (journal) , soot , mineralogy , chemistry , metallurgy , combustion , composite material , linguistics , philosophy , physics , chromatography , quantum mechanics , composite number
Supposedly high‐purity MgO, CaO, and SrO single crystals grown by the submerged arc fusion method were found to contain up to 10,000 ppm carbon, probably atomically dissolved in the oxide lattice. The carbon was nondestructively analyzed by means of the nuclear reaction 12 C ( d , p ) 13 C using 1.0 or 1.7 MeV deuterons. Concentration profile analysis indicated that the carbon content near the surface is higher than in the bulk. Heating the crystals in air to ∼800°C increases the carbon content in the upper 1 to 5 μm surface layer and decreases it in the bulk. Heating in vacuum leads to soot formation at the surface and carbon depletion inside the crystals.