Artículos de revistas
Characterization of growth sectors in synthetic quartz grown from cylindrical seeds parallel to [0001] direction
Registro en:
Materials Research. ABM, ABC, ABPol, v. 7, n. 2, p. 285-291, 2004.
1516-1439
S1516-14392004000200011
10.1590/S1516-14392004000200011
Autor
Guzzo, Pedro Luiz
Shinohara, Armando Hideki
Costa, Harlan Allen Dantas
Raslan, Alberto Arnaldo
Suzuki, Carlos Kenichi
Azevedo, Walter Mendes
Institución
Resumen
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. 285 291 Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)