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PREPARATION AND PROPERTIES OF LANGASITE AND YAG AMORPHOUS FILMS

M. Popescu1,* , F. Sava1, A. Lorinczi1, M. Stegarescu1, S. Georgescu2, I. N. Mihailescu2, G. Socol2, D. Stanoi2, L. Daroczi3, A. Kokenyesi4, M. Leonovici5, D. Wagner6

Affiliation

  1. National Institute of R&D for Materials Physics, R-77125 Bucharest-Magurele, P.O. Box MG. 7, Romania
  2. National Institute for Lasers, Plasma and Radiation Physics, R-77125 Bucharest- Magurele, P.O. Box. MG. 54, Romania National Institute of Materials Physics
  3. University of Debrecen, Department of Solid State Physics, P.O.Box 105, 4010-Debrecen, Hungary
  4. University of Debrecen, Department of Experimental Physics, P.O.Box 105, 4010-Debrecen, Hungary
  5. University of Bucharest, Faculty of Physics, P.O.Box MG. 11, 77125-Bucharest-Magurele, Romania
  6. ”Politehnica” University, Department of Physics, 313 Splaiul Independentei, 77206-Bucharest, Romania

Abstract

Amorphous thin films of langasite and YAG have been prepared from crystals targets by pulsed laser deposition, at room temperature, in vacuum, on silicon wafers. Bulges of micrometer size are formed on the film surface. Larger size bulges (10-50 micrometers in diameter) are characteristic to the annealed langasite films. Annealing at high temperatures leads to the crystallization of the films. The annealed langasite films (850 oC) are polycrystalline and partially oriented with the plane (001) parallel to the surface of the silicon wafer. The bulges break easily in the heat treated films. Their empty structure was remarked on the electron microscope images. The YAG films annealed at 1100o C shows a crystalline YAG phase depleted in Y and traces of Y2O3. An interesting feature is the presence of silver particles spread along the macrodefects (fracture lines) of the film..

Keywords

Langasite, YAG, Pulsed laser deposition, Amorphous, X-ray diffraction, Crystallization.

Submitted at: Feb. 21, 2005
Accepted at: March 23, 2005

Citation

M. Popescu, F. Sava, A. Lorinczi, M. Stegarescu, S. Georgescu, I. N. Mihailescu, G. Socol, D. Stanoi, L. Daroczi, A. Kokenyesi, M. Leonovici, D. Wagner, PREPARATION AND PROPERTIES OF LANGASITE AND YAG AMORPHOUS FILMS, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 2, pp. 963-966 (2005)