SPI Synthetics Group

	Element	%		Oxide	%		chromium_oxide
	O	31.58							This is a reflected light micrograph of a a synthetic, polished, carbon coated chromium oxide crystal. The identifying etched label, which is a feature of our standards, is invaluable for navigating in an electron beam instrument, and in this case reminds the user that this synthetic material has two phases - minor amounts of metallic chromium mixed with the oxide. This is a good standard for high concentrations of chromium. We used to use natural chromite but it was difficult to find homogeneous crystals. Chromite is now available in the CMT collection. Purity 99.7%; Alfa Aesar, MA, USA
	Cr	68.42		Cr2O3	100.00
	Sum	100.0		Sum	100.0

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Name	Description	SPI #	Each
Chromium Oxide	SPI SuppliesŪ Individual Mounted Microanalysis Standard Item	AS2070-AB	$199.56