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Type: Artigo de periódico
Title: Characterization of growth sectors in synthetic quartz grown from cylindrical seeds parallel to [0001] direction
Author: Guzzo, Pedro Luiz
Shinohara, Armando Hideki
Costa, Harlan Allen Dantas
Raslan, Alberto Arnaldo
Suzuki, Carlos Kenichi
Azevedo, Walter Mendes
Abstract: In the present study, the morphology and the impurity distribution were investigated in growth sectors formed around the [0001] axis of synthetic quartz crystals. Plates containing cylindrical holes and cylindrical bars parallel to [0001] were prepared by ultrasonic machining and further used as seed-crystals. The hydrothermal growth of synthetic quartz was carried out in a commercial autoclave under NaOH solution during 50 days. The morphologies of crystals grown from cylindrical seeds were characterized by X-ray diffraction topography. For both types of crystals, +X- and X- growth sectors were distinctly observed. Infrared spectroscopy and ionizing radiation were adopted to reveal the distribution of point defects related to Si-Al substitution and OH-species. It was found a different distribution of Al-related centers in relation to the crystals grown from conventional Y-bar and Z-plate seeds.
Subject: synthetic quartz
impurity segregation
infrared spectroscopy
X-ray topography
Editor: ABM, ABC, ABPol
Citation: Materials Research. ABM, ABC, ABPol, v. 7, n. 2, p. 285-291, 2004.
Rights: aberto
Identifier DOI: 10.1590/S1516-14392004000200011
Date Issue: 1-Jun-2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

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