ESR spectroscopy of La 2 Ga 5 SiO 14 :Cr single crystals

The ESR spectrum of La 3 Ga 5 SiO 14 single crystals activated by chromium ions is investigated. It is shown that chromium ions are incorporated into the La 3 Ga 5 SiO 14 crystal lattice in the trivalent state at laoctahedric positions. Orientations of the principal magnetic axes are determined, and parameters of the spin Hamiltonian are estimated. The effect of disorder of the crystal structure of the matrix on line widths and shapes of the ESR spectrum of impurity Cr 3+ ions is discussed.