Ultrahigh-quality silicon carbide single crystals

Article Abstract:

A method based on the dislocation structure of silicon carbide (SiC) grown perpendicular to the c-axis (a-faced growth) is described, which can be used for reducing the number of dislocations in SiC single crystals by two or three orders of magnitude. Results suggest that the crystal quality of RAF substrates is good and the repeated a-face (RAF) growth process can be used for generating single-crystal growth of other materials that have hexagonality in their crystal structures.

Science & research, Silicon Carbide, Research, Dislocations in crystals, Dislocations (Crystals), Silicon carbides

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Enough, already

Article Abstract:

The US Department of Energy is planning to increase the amount of plutonium that can be stored at the Lawrence Livermore National Laboratory in California, which is situated in a densely populated area. This has incensed antinuclear activists and they have questioned the motives and logic behind Livermore's ill-advised insistence on doubling its plutonium stock.

Facilities & equipment, California, Capacity, Plutonium, Buildings and facilities, Storage, United States. Department of Energy. Lawrence Livermore National Laboratory

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Sulphide mining by the superextensible foot of symbiotic thyasirid bivalves

Article Abstract:

Research shows that the symbiotic bivalve molluscs of the Thyasiridae family extend their feet to form burrows in the sulphur sediments in an attempt to get access to reduced sulphur. Data indicate that the length and number of burrows depend on the hydrogen sulphide concentration in the sediments.

Hydrogen Sulfide, Usage, Behavior, Environmental aspects, Burrowing animals, Bivalvia, Bivalves, Sediments (Geology)

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