ListarQFA_Articles por tema "X-ray diffraction"

Mostrando ítems 1-8 de 8

    • closedAccess   A theoretical and experimental investigation of hetero- vs. homo-connectivity in barium silicates 

      Moulton, Benjamin; Gomes, Eduardo O.; Cunha, Thiago R.; Doerenkamp, Carsten; Gracia, Lourdes; Eckert, Hellmut; Andres, Juan; Pizani, Paulo Sergio Mineralogical Society of America (2022-04)
      Barium silicates may be found in contact aureoles and are used in several important technologies (e.g., LEDs). The BaO-SiO2 system stabilizes 13 crystalline phases with different silicate tetrahedral and connectivity ...

    • openAccess   Compression of scheelite-type SrMoO4 under quasi-hydrostatic conditions: Redefining the high-pressure structural sequence 

      Errandonea, Daniel; Gracia, Lourdes; Lacomba Perales, R.; Polian, A.; Chervin, J. C. American Institute of Physics (2013)
      The high-pressure behavior of tetragonal SrMoO4 was analyzed by Raman and optical-absorption measurements. Pressures up to 46.1 GPa were generated using diamond-anvil cells and Ne or N2 as quasi-hydrostatic pressure-transmitting ...

    • closedAccess   Cuboidal Mo3S4 and Mo3NiS4 Complexes Bearing Dithiophosphates and Chiral Carboxylate Ligands: Synthesis, Crystal Structure and Fluxionality 

      Hernández Molina, Rita; González Platas, Javier; Kovalenko, Konstantin A.; Sokolov, Maxim; Llusar, Rosa; Vicent Barrera, Cristian Wiley (2011-02)
      New triangular Mo and W cluster complexes incorporating (S)-lactic acid (HLac), [Mo3S4(μ-Lac)(dtp)3(py)] (1) and [W3S4(μ-Lac)(dtp)3(py)] (2), were prepared [dtp = (EtO)2PS2]. Analogous synthetic procedures were adapted for ...

    • openAccess   Hexanuclear Niobium Cluster Compounds with Protonated N‐Base Cations 

      König, Jonas; Dartsch, Ina; Sperlich, Eric; Guillamón, Eva; Llusar, Rosa; Köckerling, Martin Wiley (2020)
      Octahedral clusters of the [M6X12] type offer numerous possibilities to form structural arrangements through different choices of bonding situations. In this paper a series of new cluster compounds of the transition metal ...

    • openAccess   High-pressure study of the behavior of mineral barite by x-ray diffraction 

      Santamaría Pérez, D.; Gracia, Lourdes; Garbarino, G.; Beltran, Armando; Chulia-Jordan, Raquel; Gomis Hilario, Óscar; Errandonea, Daniel; Ferrer Roca, Chantal María; Martínez García, Domingo; Segura García del Río, Alfredo American Physical Society (2011-08-02)
      In this paper, we report the angle-dispersive x-ray diffraction data of barite, BaSO4 , measured in a diamond-anvil cell up to a pressure of 48 GPa, using three different fluid pressure-transmitting media (methanol-ethanol ...

    • closedAccess   Photoluminescence properties of cerium oxide nanoparticles as a function of lanthanum content 

      Deus, R.C.; Cortés, J.A.; Ramirez, M.A.; Ponce, Miguel Adolfo; Andres, Juan; Rocha, L.S.R.; Longo, Elson; Simões, Alexandre Elsevier (2015)
      The structural and photoluminescent properties at room temperature of CeO2 and La-doped CeO2 particles were undertaken. The obtained particles were synthesized by a microwave-assisted hydrothermal method (MAH) under different ...

    • closedAccess   Presence of excited electronic state in CaWO4 crystals provoked by a tetrahedral distortion: An experimental and theoretical investigation. 

      Beltran, Armando; Andres, Juan; Gracia, Lourdes; Longo, V. M.; Cavalcante, Laécio Santos; Avansi, Waldir; Li, Maximo Siu; Mastelaro, Valmor Roberto; Varela, José A.; Longo, Elson © American Institute of Physics (2011-08)
      By combining experimental techniques such as x-ray diffraction, Fourier transform Raman, ultraviolet-visible, x-ray absorption near edge structure, extended x-ray absorption fine structure spectroscopy, and theoretical ...

    • openAccess   Pressure-induced phase transitions in AgClO4 

      Errandonea, Daniel; Gracia, Lourdes; Beltran, Armando; Vegas, Ángel; Meng, Yue American Physical Society (2011-08-18)
      AgClO4 has been studied under compression by x-ray diffraction and density functional theory calculations. Experimental evidence of a structural phase transition from the tetragonal structure of AgClO4 to an orthorhombic ...