Optical-memory alloys

There is another class of amorphous semiconductors based on chalcogens which predate the developments that have occurred in i -Si. Because their use has been limited, eg, to switching types of devices and optical memories, this discussion is restricted to the optoelectronic properties of i -Si-based alloys and their role in some appHcations. 

Terbium 65 Tb Lasers, electronic materials, erasable optical memory substrate, magnetostrictive alloys... 

The most popular smart materials are piezoelectric materials, magnetostric-tive materials, shape-memory alloys, electrorheological fluids, electrostrictive materials, and optical fibers. Magnetostrictives, electrostrictives, shape-memory alloys, and electrorheological fluids are used as actuators optical fibers are used primarily as sensors (see Shape Memory Polymers)... 

Chalcogenide alloys such as GeSbTe-based compounds are of interest for applications in rewritable optical media (Digital Versatile Disc, Blu-ray disc) and in non-volatile electronic memory devices [1-5]. Both applications rest on a fast and reversible transformation between the crystalline and amorphous phases which represent the two states of the memory. The phase change is induced by heating, either... 

Diamond and diamond-like carbon CVD, PACVD, ARE Protective coatings Fine particle for IR and UV optics superabrasives, AR coatings, high cutting tool for thermal conductivity aluminium alloys, substrates, micro- wear coatings for electronic devices computer memory discs ... 

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