Epitaxy keeps rolling along

Article Abstract:

Epitaxy is the deposition of a chemical species on a crystal of another chemical species such that a deposited film has a repeatable crystal orientation with respect to its substrate. Scientists have long been puzzled by the nature of indirect epitaxy, in which there is an amorphous film between the deposit and the substrate. A study of gold and silver deposits on sodium chloride or silicon substrates separated by amorphous carbon or silica films shows that the orientation of the deposits differed according to the presence or absence of an amorphous film. The results' implications for commercial applications such as diamond film deposition are discussed.

Research, Epitaxy

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Nanostructures come of age

Article Abstract:

The First International Conference on Nanostructured Materials was held at Cancun, Mexico from Sep 21 to Sep 26, 1992. Nanostructured materials are made up of particles measuring a few nanometers in one, two or all dimensions. Conference participants learned of many recent advances in this field of materials science. For instance, a new 'spray-conversion process' for producing WC/Co and other nanocomposites was presented. Other topics covered included new methods of synthesis, nanostructured powders, grains and magnetic properties.

Conferences, meetings and seminars, Nanotechnology, Materials science

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High-speed diamond

Article Abstract:

The chemical vapor deposition (CVD) method is widely used in the making of synthetic diamonds, and this method can be used to exploit the remarkable mechanical properties of diamonds in the reinforcing constituent of a fiber-composite. Diamond reinforcement can be made cost-efficiently by the microwave or hot-wire variant of CVD, making diamond a viable reinforcing fiber for high-tech uses.

Innovations, Growth, Diamonds, Chemical vapor deposition, Diamond crystals, Synthetic diamonds, Artificial diamonds

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