|About this Abstract
||Materials Science & Technology 2012
||MS&T'12 Poster Session
||B25: Direct Quantitative Elemental Analysis of High Purity Aluminum Oxide Materials by Glow Discharge Mass Spectrometry
||DeAnn Barnhart, Glyn Churchill, Karol Putyera
|On-Site Speaker (Planned)
Traditional methods for chemical purity evaluations of high purity aluminum oxides generally require complex sample preparations such as dissolution in mixed concentrated mineral acids or digestions at high pressure and temperature. Additionally, matrix analyte separation is required in order to eliminate interferences. Consequently, the dissolution rate and the residue of non-soluble substances often limit the sensitivity of these analytical approaches, and contaminations could be introduced from the chemicals as well. Alternately, ultra-trace element determination can be accomplished directly with the new GDMS, model Nu AstruM (Nu Instruments), which is the latest generation of reduced pressure glow discharge instruments exhibiting excellent abundance sensitivity. The methodology presented here involved using high purity tantalum and indium electrodes as sample holders for both powdered alumina samples and sapphire crystals. This technique allowed for the assessment of impurities in optical grade sapphire at the sub-ppm wt. level, a requirement highly sought after in industry.
||Definite: A CD-only volume