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SOLUTE DISTRIBUTION IN SHAPED SAPPHIRE CRYSTALS OBTAINED BY EFG METHOD

O. Bunoiu1,* , I. Nicoara1, T. Duffar2

Affiliation

  1. West University of Timisoara, 1900 Timisoara, Romania
  2. EPM - CNRS, BP 95, 38402 St. Martin d’Heres, France

Abstract

One of the specific defects that affect the optical properties of shaped sapphire crystals obtained by Edge-defined Film-fed Growth (EFG) method is the so-called “voids”, the trapped gas bubbles. The origin and the distribution of these trapped voids are not yet clarified. In order to study the bubbles and solute distribution sapphire rods and ribbons were obtained by EFG method. The voids and solute distribution were studied by optical microscopy and a quite regular distribution of bubbles was observed in both the rods and ribbons sapphire crystals. The solute distribution was also studied by SIMS analysis and the results show a strong correlation with the optical microscopy observations..

Keywords

Gas bubbles, EFG, Sapphire, Shaped crystals.

Submitted at: Aug. 18, 2004
Accepted at: March 23, 2005

Citation

O. Bunoiu, I. Nicoara, T. Duffar, SOLUTE DISTRIBUTION IN SHAPED SAPPHIRE CRYSTALS OBTAINED BY EFG METHOD, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 2, pp. 615-618 (2005)