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Browsing by Author "Rodríguez-Hernández, Plácida"

Now showing items 1-20 of 22

Anomalous Raman modes in tellurides

Manjón, Francisco-Javier; Gallego-Parra, Samuel; Rodríguez Hernández, Plácida; Muñoz, Alfonso; Drasar, Cestmir; Muñoz-Sanjosé, Vicente; Oeckler, Oliver (The Royal Society of Chemistry, 2021-05-21)

[EN] Two anomalous broad bands are usually found in the Raman spectrum of bulk and 2D Te-based chalcogenides, which include binary compounds, like ZnTe, CdTe, HgTe, GaTe, GeTe, SnTe, PbTe, GeTe2, As2Te3, Sb2Te3, Bi2Te3, ...
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 ...
Crystal structure of sinhalite MgAlBO4 under high pressure

Santamaría Pérez, David; Errandonea, Daniel; Gomis, O.; Sans Tresserras, Juan Ángel; Pereira, A. L. J.; Manjón Herrera, Francisco Javier; Popescu, Catalin; Rodríguez Hernández, Plácida; Muñoz, Alfonso (American Chemical Society, 2015-03-26)

We report on high-pressure angle-dispersive X-ray diffraction data up to 27 GPa for natural MgAlBO4 sinhalite mineral and ab initio total energy calculations. The experimental bulk modulus of sinhalite is B-0 = 171(3) GPa ...
Effect of pressure on La-2(WO4)(3) with a modulated scheelite-type structure

Sabalisck, N.P.; Lopez Solano, Javier; Guzmán-Afonso, C.; Santamaría Pérez, David; González-Silgo, C.; Mújica, Andrés; Muñoz, Alfonso; Rodríguez Hernández, Plácida; Radescu, Silvana; Vendrell, X.; Mestres, L.; Sans Tresserras, Juan Ángel; Manjón Herrera, Francisco Javier (American Physical Society, 2014-05-27)

We have studied the effect of pressure on the structural and vibrational properties of lanthanum tritungstate La2(WO4)3. This compound crystallizes under ambient conditions in the modulated scheelite-type structure known ...
Elastic and thermodynamic properties of alpha-Bi2O3 at high pressures: Study of mechanical and dynamical stability

Gomis, O.; Manjón, Francisco-Javier; Rodríguez-Hernández, Plácida; MUÑOZ, ALFONSO (Elsevier, 2019-01)

[EN] The elastic and thermodynamic properties of the monoclinic polymorph of bismuth oxide (alpha-Bi2O3); aka mineral bismite, have been theoretically investigated both at room pressure and under hydrostatic compression ...
Experimental and theoretical investigations on structural and vibrational properties of melilite-type Sr2ZnGe2O7 at high pressure and delineation of a high pressure monoclinic phase

Achary, S. Nagabhusan; Errandonea, Daniel; Santamaría-Pérez, David; Gomis, O.; Patwe, Sadiqua J.; Manjón Herrera, Francisco Javier; Rodríguez Hernández, Plácida; Muñoz, Alfonso; Tyagi, Avesh Kumar (American Chemical Society, 2015-07-06)

We report a combined experimental and theoretical study of melilite-type germanate, Sr2ZnGe2O7, under compression. In situ high-pressure X-ray diffraction and Raman scattering measurements up to 22 GPa were complemented ...
Experimental and theoretical investigations on the polymorphism and metastability of BiPO4

Achary, S. N.; Errandonea, Daniel; Muñoz, Alfonso; Rodríguez Hernández, Plácida; Manjón Herrera, Francisco Javier; Krishna, P. S. R.; Patwe, S. J.; Grover, V.; Tyagi, A. (Royal Society of Chemistry, 2013)

In this work we report the metastability and the energetics of the phase transitions of three different polymorphs of BiPO4, namely trigonal (Phase-I, space group P3(1)21), monoclinic monazite-type (Phase-II, space group ...
Experimental and Theoretical Study of Bi2O2Se Under Compression

Pereira, A.L.J.; Santamaría Pérez, David; Ruiz Fuertes, Javier; Manjón, Francisco-Javier; Cuenca Gotor, Vanesa Paula; Vilaplana Cerda, Rosario Isabel; Gomis, O.; Popescu, Catalin; Muñoz, Alfonso; Rodríguez-Hernández, Plácida; Segura, Alfredo; Gracia, L.; Beltran, A.; Ruleova, P.; Drasar, C.; Sans-Tresserras, Juan Ángel (American Chemical Society, 2018-04-26)

[EN] We report a joint experimental and theoretical study of the structural, vibrational, elastic, optical, and electronic properties of the layered high-mobility semiconductor Bi2O2Se at high pressure. A good agreement ...
Experimental and Theoretical Study of SbPO4 under Compression

Pereira, André Luis de Jesus; Santamaria-Pérez, David; Vilaplana Cerda, Rosario Isabel; Errandonea, Daniel; Popescu, Catalin; Da Silva, Estelina Lora; Sans-Tresserras, Juan Ángel; Rodríguez-Carvajal, Juan; Muñoz, Alfonso; Rodríguez-Hernández, Plácida; Mujica, Andres; Radescu, Silvana Elena; Beltrán, Armando; Otero-de-la-Roza, Alberto; Nalin, Marcelo; Mollar García, Miguel Alfonso; Manjón, Francisco-Javier (American Chemical Society, 2020-01-06)

[EN] SbPO4 is a complex monoclinic layered material characterized by a strong activity of the nonbonding lone electron pair (LEP) of Sb. The strong cation LEP leads to the formation of layers piled up along the a axis and ...
High pressure phase transitions in NdVO4

Panchal, V.; Errandonea, Daniel; Manjón Herrera, Francisco Javier; Muñoz, Alfonso; Rodríguez Hernández, Plácida; Bettinelli, Marco; Achary, S.N.; Tyagi, A.K. (AIP Publishing, 2015)

Raman-scattering measurements on NdVO4 suggest a pressure-induced zircon to monazite phase transition beyond 5.9 GPa. The monazite phase undergoes a second phase transition to a yet unknown phase at 18.1 GPa. Lattice-dynamics ...
High-pressure structural and vibrational properties of monazite-type BiPO4, LaPO4, CePO4, and PrPO4

Errandonea, D.; Gomis, O.; Rodríguez Hernández, Plácida; Muñoz, A.; Ruiz Fuertes, J.; Gupta, M.; Achary, S.N.; Hirsch, A.; Manjón, Francisco-Javier; Peters, L.; Roth, G.; Tyagi, A.K.; Bettinelli, Marco (IOP Publishing, 2018)

[EN] Monazite-type BiPO4, LaPO4, CePO4, and PrPO4 have been studied under high pressure by ab initio simulations and Raman spectroscopy measurements in the pressure range of stability of the monazite structure. A good ...
High-Pressure Synthesis of betha and alpha-In2Se3-Like Structures in Ga2S3

Gallego-Parra, Samuel; Vilaplana Cerda, Rosario Isabel; Gomis, O.; Rodríguez-Hernández, Plácida; Muñoz, Alfonso; González, Jesus Antonio; Sans-Tresserras, Juan Ángel; Popescu, Catalin; Manjón, Francisco-Javier (American Chemical Society, 2022-07-12)

[EN] The synthesis of polymorphs of alpha '-Ga2S3 at room temperature on compression/decompression is studied from a joint experimental and theoretical point of view to reveal the nature of their crystalline structures. ...
Lattice dynamics study of HgGa2Se4 at high pressures

Vilaplana Cerda, Rosario Isabel; Gomis Hilario, Oscar; Manjón Herrera, Francisco Javier; Ortiz, H. M.; Pérez González, E.; López Solano, Javier; Rodríguez Hernández, Plácida; Múñoz, Alfonso; Errandonea, Daniel; Ursaki, V.; Tiginyanu, Ivan (American Chemical Society, 2013-08)

We report on Raman scattering measurements in mercury digallium selenide (HgGa2Se4) up to 25 GPa. We also performed, for the low-pressure defect-chalcopyrite structure, lattice-dynamics ab initio calculations at high ...
Lattice dynamics study of nanocrystalline yttrium gallium garnet at high pressure

Monteseguro, V.; Rodríguez Hernández, Plácida; Vilaplana Cerda, Rosario Isabel; Manjón Herrera, Francisco Javier; Venkatramu, V.; Errandonea, Daniel; Lavin, V.; Muñoz, Alfonso (American Chemical Society, 2014-06-19)

This work reports an experimental and theoretical lattice dynamics study of nanocrystalline Y3Ga5O12 (YGG) garnet at high pressures. Raman scattering measurements in nanocrystalline Tm3+-doped YGG garnet performed up to ...
Ordered helium trapping and bonding in compressed arsenolite: Synthesis of As4O6 2He

Sans Tresserras, Juan Ángel; Manjón Herrera, Francisco Javier; Popescu, Catalin; Cuenca Gotor, Vanesa Paula; Gomis, Oscar; Muñoz, Alfonso; Rodríguez Hernández, Plácida; Contreras García, Julia; Pellicer Porres, Julio; Pereira, A.L.J.; Santamaría Pérez, David; Segura, Alfredo (American Physical Society, 2016-02)

Compression of arsenolite has been studied from a joint experimental and theoretical point of view. Experiments on this molecular solid at high pressures with different pressure-transmitting media have been interpreted ...
Pbca-Type In2O3: the high-pressure post-corundum phase at room temperature

García-Domene, B.; Sans Tresserras, Juan Ángel; Gomis, O.; Manjón Herrera, Francisco Javier; Ortiz, H. M.; Errandonea, Daniel; Santamaría Pérez, David; Martinez-Garcia, D.; Vilaplana Cerda, Rosario Isabel; Pereira, A. L. J.; Morales-Garcia, A.; Rodríguez Hernández, Plácida; Muñoz, Alfonso; Popescu, Catalin; Segura, A. (American Chemical Society, 2014-09-04)

High-pressure powder X-ray diffraction and Raman scattering measurements in cubic bixbyite-type indium oxide (c-In2O3) have been performed at room temperature. On increasing pressure c-In2O3 undergoes a transition to the ...
Pressure-driven configurational crossover between 4f(7) and 4f(6)5d(1 )States - Giant enhancement of narrow Eu2+UV-Emission lines in SrB4O7 for luminescence manometry

Zheng, Teng; Runowski, Marcin; Rodríguez Hernández, Plácida; Muñoz González, Alfonso; Manjón, Francisco-Javier; Sojka, Malgorzata; Suta, Markus; Zych, Eugenius; Lis, Stefan; Lavin, Victor (Elsevier, 2022-06)

[EN] Accurate, fast, and non-invasive methods for the determination of the local pressure magnitude are crucial for the investigation of the physical and chemical behavior of materials at the extreme conditions of high ...
Pressure-Driven Isostructural Phase Transition in InNbO4: In Situ Experimental and Theoretical Investigations

Garg, Alka B.; Errandonea, Daniel; Popescu, Catalin; Martínez-García, Domingo; Pellicer Porres, Julio; Rodríguez-Hernández, Plácida; Muñoz, Alfonso; Botella, Pablo; Cuenca Gotor, Vanesa Paula; Sans-Tresserras, Juan Ángel (American Chemical Society, 2017-05-01)

[EN] The high-pressure behavior of technologically important visible-light photocatalytic semiconductor In.NbO4, adopting a monoclinic wolframite-type structure at ambient conditions, was investigated using synchrotron-based ...
Structural and Lattice-Dynamical Properties of Tb2O3 under Compression: A Comparative Study with Rare Earth and Related Sesquioxides

IBAÑEZ, JORDI; Sans-Tresserras, Juan Ángel; Cuenca-Gotor, Vanesa Paula; OLIVA, R.; Gomis, O.; Rodríguez-Hernández, Plácida; MUÑOZ, A.; Rodriguez-Mendoza, U.R.; Velazquez, M.; Veber, P.; Popescu, Catalin; Manjón, Francisco-Javier (American Chemical Society, 2020-07-20)

[EN] We report a joint experimental and theoretical investigation of the high pressure structural and vibrational properties of terbium sesquioxide (Tb2O3). Powder X-ray diffraction and Raman scattering measurements show ...