F. J. Manjón

Silent Raman modes in zinc oxide and related nitrides

Anomalous Raman modes have been reported in several recent papers dealing with doped- and undoped-ZnO layers grown by different methods. Most of these anomalous Raman modes have been attributed to local vibrational modes of impurities or defects. However, we will show that most of the observed modes correspond to wurtzite-ZnO silent modes allowed by the breakdown of the translational crystal symmetry induced by defects and impurities.

High-pressure structural study of the scheelite tungstates CaWO4 and SrWO4

Angle-dispersive x-ray-diffraction and x-ray-absorption near-edge structure measurements have been performed on

Optical properties and electronic structure of rock-salt ZnO under pressure

{\mathrm{CaWO}}_{4}

Determination of the high-pressure crystal structure of Ba W O 4 and Pb W O 4

and

Combined Raman scattering and ab initio investigation of pressure-induced structural phase transitions in the scintillator ZnWO 4

{\mathrm{SrWO}}_{4}

High-pressure x-ray diffraction study on the structure and phase transitions of the defect-stannite ZnGa2Se4 and defect-chalcopyrite CdGa2S4

up to pressures of approximately 20 GPa. Both materials display similar behavior in the range of pressures investigated in our experiments. As in the previously reported case of

Growth, characterization, and high-pressure optical studies of CuWO4

{\mathrm{CaWO}}_{4}

High-pressure optical and vibrational properties of CdGa2Se4: Order-disorder processes in adamantine compounds

, under hydrostatic conditions

High-pressure effects on the optical-absorption edge of CdIn2S4, MgIn2S4, and MnIn2S4 thiospinels

{\mathrm{SrWO}}_{4}

High-pressure Raman spectroscopy and lattice-dynamics calculations on scintillating MgWO4: Comparison with isomorphic compounds

undergoes a pressure-induced scheelite-to-fergusonite transition around 10 GPa. Our experimental results are compared to those found in the literature and are further supported by ab initio total-energy calculations, from which we also predict the instability at larger pressures of the fergusonite phases against an orthorhombic structure with space group Cmca. Finally, a linear relationship between the charge density in the