Please use this identifier to cite or link to this item:
|Type:||Artigo de evento|
|Title:||Characterization Of Brazilian Lascas From Various Regions And Their Use For Synthetic Quartz Growth - I: Lascas Study.|
Suzuki Carlos K.
Oliveira Virgina A.R.
Hummel Daniel C.A.
Shinohara Armando H.
|Abstract:||Brazilian quartz-mine survey and lascas-sample in situ collection have been carried out in various regions. The lascas quality control is based on a visual classification according to their transparency as 1st, mix, 2nd, 3rd, 4th, . . . lascas, called nominal grades in the present study a characterization of lascas by various techniques, such as X-ray diffraction topography and goniometry, density measurement, ultrasonic attenuation, optical microscopy, and atomic absorption spectroscopy, has been carried out. It has been observed that several lascas properties, such as crystallinity, density, microcavity concentration and size, crack patterns and ultrasonic attenuation correlated with the nominal grades. Impurities content is independent of the nominal grades but does depend on the extraction sites.|
|Editor:||IEEE, New York, NY, USA|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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