Standards for Microanalysis

Time 2020-11-09 14:04:37

Web Name: Standards for Microanalysis

WebSite: http://astimex.com

ID:110136

Keywords:

Standards,for,Microanalysis,

Description:

Astimex Standards Ltd. produces polished metallic element, rare earth element, rare earth phosphate, mineral and synthetic compoundstandards suitable for ElectronMicroprobe and Scanning Electron Microscope X-ray Analysis.They are also suitable for Laser Ablation Mass Spectrometric Analysis.Among our "Package mounts" (or standards formicroanalysis), all naturally occurring stable elements are represented, withthe exception of the noble gases. The pure metals are all of those which are stableand solid at room temperature and which can be prepared in a polished form.Some of them are more suitable than others for this type of use, andsome degree of oxidation or failure to polish well may be expected in certain cases.The purity of the metals is always better than 99%, and most of them more than 99.99%.Details of the individual purities and source supplier are given with each purchase, or on request.Even the light element range, difficult to access by X-ray analysis is given complete coverage.The53 minerals and compounds,for which analyses are provided on purchase, are chosento give comprehensive coverage of the elements, especially those which cannotbe mounted in the pure form. These minerals are carefully selected on the basis of their homogeneity within andbetween grains, and have been analyzed quantitatively at the Universities ofToronto or Alberta. Some of the materials are synthetic and, after experimental confirmation that they containno detectable impurities, ideal compositions have been assigned to them. Between the minerals and metals, mostnaturally occurring elements are represented in major concentrations, with the only notable exception being the noble gases.Metals and minerals can be mounted and polished separately or together,though there are certain recommended groupings, referred to below as Package Mounts,which are held as stock items, and for which the prices are set.However customers are encouraged to select the mount geometry and standard materialsfor their own individual needs, and custom arrangements will be quoted onrequest. It may be necessary to make substitutions from time to time in the minerals offered, but every effort willbe made to preserve a similar diversity of range. Labels, including a reference number and, in most cases, a description in letters 60 µm high, are engraved onto the mounting medium using a computer controlled electron beam. This feature has proved extremely useful in route finding on the higher density mounts, particularly when the sample can only be observed through high power magnification. Carbon coating is necessary prior to the labelling operation. The lettering can be read in the secondary or backscattered electron images of an SEM or through the light microscope viewing system of a microprobe. Labels are normally written for direct viewing, but mirror images can be supplied on special order at no additional charge. Electron beam lettering for albiteThe popular mount sizes are 25mm diameter (1 inch) and 12.5mm (½ inch).The 25mm mounts are stainless steel discs, 6mm thick; the 12.5mm mounts are also stainless steel but only 4mm thick.See the various layout patterns and contents of the Package Mounts.The Rare Earth Elements are grouped together in a single mount as thisis convenient for geochemical work, and as several of these are unstable in themetallic form, fluorides are used as an alternate.The mounting medium used in all mounts is epoxy resin.Carbon coating is provided to giveconductivity from the metal or mineral grains to the stainless steel mountwhich encloses the plastic.The metals and minerals are most economically purchased in the Package Mounts, butin the case that a special selection of items is made, the charge is on a peritem basis.Minerals and synthetic materials other than those listed may be available on request.A Faraday cup, for accuratespecimen current measurement, can be included in any of our standards mounts, occupying the vacantcentral position. The Faraday Cup consists of a 200 µm platinum aperture flush with themount surface and set in the top of a hollow stainless steel tube.The bottom of the tube is closed, and an electrical connection is made through the mount body.Minerals and materials notlisted above may be obtained on request, and a customer's own items can beincluded or substituted as a special order.

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