Gallium Arsenide GaAs

Source: Alfa Aesar, Massachusetts, USA

	Element	%
	Ga	48.20
	As	51.80

	Sum	100.0


	200 µ m

This is a reflected light micrograph of polished, carbon coated synthetic gallium arsenide crystals. The identifying etched label, which is a feature of our standards, is invaluable for navigating in an electron beam instrument. There are no minerals containing significant amounts of gallium for use as a standard. Arsenic is an element which oxidizes easily and so is unsuitable for mounting and polishing. But the compound, GaAs, widely used in the semi-conductor business, contains both these elements in major amounts, and is stable and easily polished. hence its presence in this set.

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Cautionary Note

The compositional and other data shown here are intended to convey typical values for this item and do not neccessarily correspond in detail to standard mounts supplied in the past or to be supplied in the future. Items are changed from time to time as stock is exhausted or alternate choices are preferred. These data should, however, give someone contemplating the purchase of an SPI standard a fair indication of what they may expect to receive. Records are kept of all mounts sold so that, should you lose your documentation at some time in the future, we will be happy to replace it at no charge.

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