“…YAG has been considered a prime candidate for its use as a matrix in oxide-oxide composites in gas turbine engines (Mah et al, 2004). Also, it can be used as substrate for dielectric components, prisms and mirrors, as a part of discharge lamps, high intensity lamps as well as an active medium for the production of lasers (Ikesue et al, 1995), since it is able to accept trivalent cations in its structure, especially rare earths and transition metals. In this sense, YAG can be doped with Yb 3+ for diode-laser (Takaichi et al, 2003), with Er 3+ (Qin et al, 2004) widely used in medical applications or Eu 3+ (Shikao et al, 2001) used as cathode ray tube.…”