Listar por tema "X-ray diffraction"

Mostrando ítems 1-12 de 12

    • 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   New insights in the structure-luminescence relationship of Eu:SrAl2O4 

      Cordoncillo, Eloisa; Julian-Lopez, Beatriz; Martínez, M.; Sanjuan, M.L.; Escribano López, Purificación Elsevier (2009)
      This work aims the preparation of Eu:SrAl2O4 through a sol-gel methodology. Some studies point out the possibility that hexagonal polymorph exhibit higher luminescence efficiency than the monoclinic one. However, the slow ...

    • closedAccess   pH-Tunable Hydrogelators for Water Purification: Structural Optimisation and Evaluation 

      Greenland, Barnaby W.; Wood, Daniel M.; Acton, Aaron L.; Rodríguez Llansola, Francisco; Murray, Claire A.; Cardin, Christine J.; Miravet, Juan; Escuder, Beatriu; Hamley, Ian W.; Hayes, Wayne Wiley (2012-02)
      A focused library of potential hydrogelators each containing two substituted aromatic residues separated by a urea or thiourea linkage have been synthesised and characterized. Six of these novel compounds are highly efficient ...

    • 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 ...

    • openAccess   Probing the 3‐step Lithium Storage Mechanism in CH3NH3PbBr3 Perovskite Electrode by Operando‐XRD Analysis 

      Vicente-Agut, Nuria; Bresser, Dominic; Passerini, Stefano; Garcia-Belmonte, Germà Wiley (2019-01-19)
      Organic‐inorganic hybrid materials have gradually become one of the most actively studied research fields due to their fascinating properties. The reaction between lithium and organic‐inorganic halide perovskite has just ...

    • closedAccess   Synthesis of Cr-doped CaTiSiO5 ceramic pigments by spray drying 

      Lyubenova, Teodora; Matteucci, Francesco; Costa, Anna Luisa; Dondi, Michele; Ocaña Jurado, Manuel; Carda Castelló, Juan Bautista Elsevier (2009)
      Cr-doped CaTiSiO5 was synthesized by spray drying and conventional ceramic method in order to assess its potential as ceramic pigment. The evolution of the phase composition with thermal treatment was investigated by X-ray ...