Abstract
Dense chromium oxide nanocondensates dissolved with ca. 4 at% Si according to energy-dispersive X-ray analysis were fabricated by pulsed laser ablation on a clamped Cr/Si target in oxygen for a very rapid heating/cooling and hence pressure effect. Transmission electron microscopic observations indicated that the predominant corundum-type Si 4+: α-Cr 2O 3 nanocondensates are hexagonal in shape with significant residual compressive stress, and the minor spinel-like Si 4+:Cr 3O 4 nanocondensates are octahedral in shape with considerable tetragonal distortion. The predominant Si 4+: α-Cr 2O 3 condensates tended to coalesce over stepwise (0 0 0 1) or lateral ( 1 1 ¯ 0 2 ) surface to generate dislocations until the parallel epitaxial relationship was exactly reached via a Brownian rotation process of the particles. X-ray diffraction indicated that the residual compressive stress was quite released for the coarsened/coalesced condensates. The present laser ablation condensation behavior shed light on an alternative formation mechanism of Cr-rich oxide particles on the surface of Cr 4+-doped YAG fiber.
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