%0 Journal Article
%T Characterization of growth sectors in synthetic quartz grown from cylindrical seeds parallel to [0001] direction
%A Guzzo
%A Pedro Luiz
%A Shinohara
%A Armando Hideki
%A Costa
%A Harlan Allen Dantas
%A Raslan
%A Alberto Arnaldo
%A Suzuki
%A Carlos Kenichi
%A Azevedo
%A Walter Mendes
%J Materials Research
%D 2004
%I ABM, ABC, ABPol, SBCC, SBCr, SBMM, SBPMat
%R 10.1590/S1516-14392004000200011
%X 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.
%K synthetic quartz
%K impurity segregation
%K infrared spectroscopy
%K x-ray topography.
%U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S1516-14392004000200011&lng=en&nrm=iso&tlng=en