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Type: Artigo de evento
Title: Characterization Of Brazilian Lascas From Various Regions And Their Use For Synthetic Quartz Growth - I: Lascas Study.
Author: Iwasaki Hideo
Iwasaki Fumiko
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
Rights: fechado
Identifier DOI: 
Date Issue: 1986
Appears in Collections:Unicamp - Artigos e Outros Documentos

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