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Listar por palabra clave "X-ray diffraction"

Mostrando ítems 1-20 de 36

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Análisis y caracterización microestructural de titanio alfa+beta obtenido por fabricación aditiva

Urrea Montolio, Noelia (Universitat Politècnica de València, 2023-10-20)

[ES] La fabricación aditiva de las aleaciones de titanio se centra principalmente en la aleación Ti-6Al-4V y especialmente en la de bajo contenido en intersticiales por su aplicabilidad en el campo biomédico. Sin embargo, ...
Crystal Chemistry of CdIn2S4, MgIn2S4, and MnIn2S4 thiospinels under high pressure

Santamaría Pérez, David; Amboage, Mónica; Manjón Herrera, Francisco Javier; Errandonea, Daniel; Muñoz, Alfonso; Rodríguez Hernández, Plácida; Mújica, Andrés; Radescu, Silvana; Ursaki, Veacheslav; Tinginyanu, Ivan (American Chemical Society, 2012-07-05)

We report X-ray diffraction measurements in CdIn2S4, MgIn2S4, and MnIn2S4 thiospinels at room temperature and high pressures. The pressure dependences of the structural parameters have been determined and compared to those ...
Crystal structure of HgGa2Se4 under compression

Gomis Hilario, Oscar; Vilaplana Cerda, Rosario Isabel; Manjón, F.J.; Santamaría Pérez, David; Errandonea, Daniel; Pérez González, Eduardo; López Solano, Javier; Rodríguez Hernández, Plácida; Muñoz, Alfonso; Tiginyanu, Ion Mijail; Ursaki, Veaceslav Vladimir (Elsevier, 2013)

We report on high-pressure x-ray diffraction measurements up to 17.2 GPa in mercury digallium selenide (HgGa2Se4). The equation of state and the axial compressibilities for the low-pressure tetragonal phase have been ...
Deactivation Pathways of the Catalytic Activity of Metal-Organic Frameworks in Condensation Reactions

Opanasenko, Maksym; Dhakshinamoorthy, Amarajothi; Cejka, Jiri; García Gómez, Hermenegildo (Wiley-VCH Verlag, 2013-06)

[EN] In the present study we have selected three different condensation reactions as model reactions, namely the hydroxylalkylation of anisole by paraformaldehyde to bis(methoxyphenyl)-methane, the Pechmann condensation ...
Effect of nanosilica-based activators on the performance of an alkali-activated fly ash

Rodriguez Martinez, Erich David; Bernal, Susan A.; Provis, John L.; Paya Bernabeu, Jorge Juan; Monzó Balbuena, José Mª; Borrachero Rosado, María Victoria (Elsevier, 2013-01)

This paper assesses the effect of the use of an alternative activator based on nanosilica/MOH (M = K+ or Na+) blended solutions on the performance of alkali-activated fly ash binders. Binders produced with commercial ...
Estudio de la síntesis de sólidos microporosos usando amonios cuaternarios derivados del 4,4'-bis(clorometil)-1,1'-bifenil como agentes directores de estructura en la sintesis hidrotermal de zeolitas

Hernandis Altur, Vicente (Universitat Politècnica de València, 2019-07-30)

[ES] En este trabajo de fin de grado se han sintetizado materiales microporosos, zeolitas, a partir de derivados del 4,4'-bis(clorometil)-1,1'-bifenil sustituyendo los cloros por aminas terciarias como son la trimetilamina, ...
Estudio de la síntesis de zeolitas usando cationes derivados de (Fenilendimetilen)bis(tripropilamonio) como agentes directores de estructura

Aliques Tomás, María del Carmen (Universitat Politècnica de València, 2018-10-03)

[ES] En el presente proyecto, se evalúa la capacidad como agentes directores de estructura una familia de cationes derivados de (Fenilendimetilen)bis(tripropilamonio). El proyecto describe la preparación de estos nuevos ...
Experimental and Theoretical Studies on alfa-In2Se3 at High Pressure

Vilaplana Cerda, Rosario Isabel; Gallego-Parra, Samuel; Jorge-Montero, A.; Rodríguez-Hernández, Plácida; Muñoz, Alfonso; Errandonea, Daniel; Segura, Alfredo; Manjón, Francisco-Javier (American Chemical Society, 2018)

[EN] alpha(R)-In2Se3 has been experimentally and theoretically studied under compression at room temperature by means of X-ray diffraction and Raman scattering measurements as well as by ab initio total-energy and ...
Experimental and theoretical study of dense YBO3 and the influence of non-hydrostaticity.

Turnbull, Robin; Errandonea, Daniel; Cuenca-Gotor, Vanesa Paula; Sans-Tresserras, Juan Ángel; Gomis, O.; Gonzalez, Alfonso; Rodríguez-Hernandez, Placida; Popescu, Catalin; Bettinelli, Marco; Mishra, Karuna K.; Manjón, Francisco-Javier (Elsevier, 2021-01-05)

[EN] YBO3 is used in photonics applications as a host for red phosphors due to its desirable chemical stability, high quantum efficiency and luminescence intensity. Despite its fundamental thermodynamic nature, the isothermal ...
Experimental and theoretical study of α–Eu2(MoO4)3 under compression

Guzmán-Afonso, C.; León-Luis, S.F.; Sans-Tresserras, Juan Ángel; González -Silgo, C.; Rodríguez-Hernández, Plácida; Radescu, S.; Muñoz, A.; López-Solano, J.; Errandonea, D.; Manjón, F.J.; Rodríguez-Mendoza, U.R.; Lavín, V. (IOP Publishing, 2015-11-25)

The compression process in the α-phase of europium trimolybdate was revised employing several experimental techniques. X-ray diffraction (using synchrotron and laboratory radiation sources), Raman scattering and ...
Exploring the crystal structure and properties of ytterbium orthoantimonate under high pressure

Garg, A.B.; López Moreno, Sinhué; P. Botella; Gomis, O.; Bandiello, Enrico; Osman, H.; Popescu, Catalin; Errandonea, Daniel (The Royal Society of Chemistry, 2023-09-27)

[EN] The crystal structure of YbSbO4 was determined from powder X-ray diffraction data using the Rietveld method. The effect of pressure on the crystal structure was also studied and the P-V equation of state determined.
GdBO3 and YBO3 crystals under compression

Turnbull, Robin; Errandonea, Daniel; Sans-Tresserras, Juan Ángel; Cuenca-Gotor, Vanesa Paula; Vilaplana Cerda, Rosario Isabel; Ibáñez, Jordi; Popescu, Catalin; Szczeszak, Agata; Lis, Stefan; Manjón, Francisco-Javier (Elsevier, 2021-06-15)

[EN] High-pressure X-ray diffraction studies on nanocrystals of the GdBO3 and YBO3 rare-earth orthoborates are herein reported up to 17.4(2) and 13.4(2) GPa respectively. The subsequent determination of the room- temperature ...
High-pressure characterization of multifunctional CrVO4

Botella, P.; López-Moreno, S.; Errandonea, D.; Manjón, Francisco-Javier; Sans-Tresserras, Juan Ángel; Vie, D.; Vomiero, A. (IOP Publishing, 2020-09-09)

[EN] The structural stability and physical properties of CrVO(4)under compression were studied by x-ray diffraction, Raman spectroscopy, optical absorption, resistivity measurements, andab initiocalculations up to 10 GPa. ...
High-pressure structural, elastic, and thermodynamic properties of zircon-type HoPO4 and TmPO4

Gomis, O.; Lavina, B.; Rodriguez-Hernandez, P.; Muñoz, A.; Errandonea, R.; Errandonea, Daniel; Bettinelli, M. (IOP Publishing, 2017-03-08)

[EN] Zircon-type holmium phosphate (HoPO4) and thulium phosphate (TmPO4) have been studied by single-crystal x-ray diffraction and ab initio calculations. We report on the influence of pressure on the crystal structure, ...
High-pressure theoretical and experimental study of HgWO4

Lopez-Solano, J.; Rodriguez-Hernandez, Plácida; Muñoz, A.; Santamaria-Perez, David; Manjón Herrera, Francisco Javier; Ray, S.; Gomis Hilario, Oscar; Mollar García, Miguel Alfonso; Panchal, V.; Errandonea, Daniel (Taylor & Francis, 2011-03)

HgWO 4 at ambient pressure is characterized using a combination of ab initio calculations, X-ray diffraction and Raman scattering measurements. The effect of low pressure and temperature on the structural stability is ...
Isostructural second-order phase transition of b-Bi2O3 at high pressures: an experimental and theoretical study

Pereira, Andre L. J.; Sans Tresserras, Juan Ángel; Vilaplana Cerda, Rosario Isabel; Gomis, O.; Manjón Herrera, Francisco Javier; Rodriguez-Hernandez, Placida; Muñoz, Alfonso; Popescu, Catalin; Beltran, Armando (American Chemical Society, 2014-10-09)

We report a joint experimental and theoretical study of the structural and vibrational properties of synthetic sphaerobismoite (beta-Bi2O3) at high pressures in which room-temperature angle-dispersive X-ray diffraction ...
Joint experimental and theoretical study of bulk Y2O3 at high pressure

Pereira, A.L.J.; Sans-Tresserras, Juan Ángel; Gomis, O.; Santamaría-Pérez, D.; Ray, S.; Rodríguez-Hernández, P.; Godoy-Jr., A.; da Silva-Sobrinho, A.S.; Muñoz, A.; Popescu, C.; Manjón, Francisco-Javier (Elsevier, 2023-06)

[EN] We report a joint experimental and theoretical study of the structural and vibrational properties of C-type bulk Y2O3 under hydrostatic compression. The combination of high-pressure X-ray diffraction and Raman scattering ...
Microwave calorimetry using X-rays

Nicula, R.; Stir, M.; Wurm, A.; Catalá Civera, José Manuel; Ishizaki, K.; Vaucher, S.; Zhuravlev, E.; Schick, C. (Elsevier, 2011-11-10)

An alternative approach for microwave calorimetry is proposed which relies on the synchrotron radiation powder diffraction technique as well as on the Grüneisen formalism for the analysis of thermal expansion. Cobalt was ...
One body, many heads; the Cerberus of catalysis. A new multipurpose in-situ cell for XAS at ALBA

Guilera, Gemma; Rey Garcia, Fernando; Hernandez Fenollosa, Juan; Cortés Vergaz, Juan José (IOP Publishing, 2013)

A new multi-purpose in-situ cell and its control system have been developed for synchrotron-based techniques as are X-Ray Absorption spectroscopy (XAS) and X-Ray Diffraction (XRD). The cell is made of a stainless steel ...
Orpiment under compression: metavalent bonding at high pressure

Cuenca-Gotor, Vanesa Paula; Sans-Tresserras, Juan Ángel; Gomis, O.; Mujica, Andres; Radescu, Silvana; Muñoz, Alfonso; Rodríguez-Hernández, Plácida; Da Silva, Estelina Lora; Popescu, Catalin; Ibañez, Jordi; Vilaplana Cerda, Rosario Isabel; Manjón, Francisco-Javier (The Royal Society of Chemistry, 2020-02-14)

[EN] We report a joint experimental and theoretical study of the structural, vibrational, and electronic properties of layered monoclinic arsenic sulfide crystals (a-As2S3), aka mineral orpiment, under compression. X-ray ...