Accession Number : AD0681468

Title :   INVESTIGATIONS OF SOME OXIDE CRYSTALS BY ESR AND OPTICAL METHODS.

Descriptive Note : Final scientific rept.,

Corporate Author : TECHNISCHE HOCHSCHULE DARMSTADT (WEST GERMANY) PHYSIKALISCHES INSTITUT (II)

Personal Author(s) : Elschner,B.

Report Date : 01 SEP 1968

Pagination or Media Count : 35

Abstract : The mineral Benitoite was investigated by Electron-Spin-Resonance (ESR). A FORTRAN-program was written to compute the constants of the Spin-Hamiltonian from the resonance magnetic fields. It also computes the energy eigenvalues of the Spin-Hamiltonian. These are in good agreement with experiment thus indicating that the right Spin-Hamiltonian was chosen. This program was used to set up the Spin-Hamiltonian of gadolinium ions Gd(3+) in YCl3.6 H2O and of iron ions Fe(3+) in SnO2. SnO2-crystals, both undoped and doped with vanadium ions V(4+) and iron ions Fe(3+), were grown from the vapor phase and investigated by measuring resistivity, optical transmission, and ESR. Ruby-crystals with different concentrations of chromium ions Cr(3+) were grown with aid of a Verneuil set up. The fluorescence lifetime was measured at various temperatures and concentrations using a sampling technique according to Zarowin. Several crystals of the boracite-type were grown with aid of a transport-reaction according to H. Schmid and the optical transmission was analyzed. The ESR-Spectrum of Ni-J-boracite was recorded and interpreted by an effective spin S = 1/2. A giant pulse LASER was built and frequency doubling of boracites was investigated. The magneto-electric effect of Ni-J-Boracite was measured. (Author)

Descriptors :   (*BAND THEORY OF SOLIDS, *OXIDES), (*LASERS, MATERIALS), ELECTRON PARAMAGNETIC RESONANCE, MINERALS, CRYSTAL STRUCTURE, RUBY, FLUORESCENCE, DOPING, YTTRIUM COMPOUNDS, CHLORIDES, TIN COMPOUNDS, SPECTROSCOPY, WEST GERMANY

Subject Categories : Crystallography
      Optics
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE