Listar por autor "Señarís-Rodríguez, M. A."

Mostrando ítems 1-17 de 17

    • A simple solvothermal synthesis of MFe2O4 (M=Mn, Co and Ni) nanoparticles 

      Yáñez Vilar, Susana; Sánchez-Andújar, Manuel; Gómez Aguirre, Lilián Claudia; Mira Pérez, Jorge; Señarís-Rodríguez, M. A.; Castro-García, Socorro (Elsevier, 2009-10)
      [Abstract] Nanoparticles of MFe2O4 (M=Mn, Co and Ni), with diameters ranging from 5 to 10 nm, have been obtained through a solvothermal method. In this synthesis, an alcohol (benzyl alcohol or hexanol) is used as both a ...

    • Anomalous and Colossal Thermal Expansion, Photoluminescence, and Dielectric Properties in Lead Halide-Layered Perovskites With Cyclohexylammonium and Cyclopentylammonium Cations 

      Cuquejo-Cid, Alberto; García-Fernández, Alberto; Popescu, Catalin; Bermúdez-García, Juan Manuel; Señarís-Rodríguez, M. A.; Castro-García, Socorro; Vázquez, Digna; Sánchez-Andújar, Manuel (Elsevier, 2022-06-03)
      [Abstract] A detailed study of lead halide-layered perovskites with general formula A2PbX4 (where A is cyclohexylammonium (CHA) or cyclopentylammonium (CPA) cation and X is Cl− or Br− anion) is presented. Using variable ...

    • Apparent colossal dielectric constants in nanoporous Metal Organic Frameworks 

      Sánchez-Andújar, Manuel; Yáñez-Vilar, Susana; Pato-Doldán, Breogán; Gómez-Aguirre, Claudia; Castro-García, Socorro; Señarís-Rodríguez, M. A. (American Chemical Society (ACS), 2012-05-30)
      [Abstract] In this work, we show that the hybrid material Co2(1,4-bdc)2(dabco)•[4DMF•1H2O], shows an apparent colossal dielectric constant at room temperature (r5000 at 300 K for =100 Hz). Nevertheless, such response ...

    • Atypical Magnetic Behavior in the Incommensurate (CH3NH3)[Ni(HCOO)3] Hybrid Perovskite 

      Breogán Pato, Doldán; Cañadillas-Delgado, Laura; Gómez Aguirre, Lilian Claudia; Señarís-Rodríguez, M. A.; Sánchez-Andújar, Manuel; Fabelo, Óscar; Mira, Jorge (ACS, 2023-02-02)
      [Abstract] A plethora of temperature-induced phase transitions have been observed in (CH3NH3)[M(HCOO)3] compounds, where M is Co(II) or Ni(II). Among them, the nickel compound exhibits a combination of magnetic and nuclear ...

    • Charge ordering and dielectric properties in the near half-doped Pr0.79Na0.21MnO3 perovskite 

      Sánchez-Andújar, Manuel; Yáñez Vilar, Susana; Castro-García, Socorro; Señarís-Rodríguez, M. A. (Elsevier, 2008-06)
      [Abstract] The Pr0.79Na0.21MnO3 perovskite has been prepared in polycrystalline form by a ceramic method. We have carried out its structural characterization by synchrotron X-ray powder diffraction (SXRPD) at room temperature ...

    • Coexistence of magnetic and electrical order in the new perovskite-like (C3N2H5)[Mn(HCOO)3] formate 

      Pato Doldán, Breogán; Gómez Aguirre, Lilián Claudia; Bermúdez-García, Juan Manuel; Sánchez-Andújar, Manuel; Fondado Fondado, Alfonso; Mira Pérez, Jorge; Castro-García, Socorro; Señarís-Rodríguez, M. A. (The Royal Society of Chemistry, 2013-09)
      [Abstract] In this work we further the structural characterization of the recently discovered (C3N2H5)[Mn(HCOO)3] metal–organic framework with perovskite-like structure, and we present its magnetic and dielectric properties ...

    • Discovery of Colossal Breathing-Caloric Effect under Low Applied Pressure in the Hybrid Organic–Inorganic MIL-53(Al) Material 

      García Ben, Javier; López-Beceiro, Jorge; Artiaga, Ramón; Salgado-Beceiro, Jorge; Delgado Ferreiro, Ignacio; Kolen'ko, Yury V.; Castro-García, Socorro; Señarís-Rodríguez, M. A.; Sánchez-Andújar, Manuel; Bermúdez-García, Juan Manuel (American Chemical Society, 2022-03-30)
      [Abstract] In this work, “breathing-caloric” effect is introduced as a new term to define very large thermal changes that arise from the combination of structural changes and gas adsorption processes occurring during ...

    • Influence of aluminum doping on the properties of LiCoO2 and LiNi0.5Co0.5O2 oxides 

      Castro-García, Socorro; Castro Couceiro, Ada; Señarís-Rodríguez, M. A.; Soulette, F.; Julien, C. (Elsevier, 2003-01)
      We have prepared LiCo1−yAlyO2 and LiNi0.5−yAlyCo0.5O2 (0≤y≤0.3) powder samples by a low temperature sol–gel method using succinic acid as chelating agent. We have studied the details of their crystallographic and local ...

    • IR characterization of Ln2−xSrxCoO4 (x≥1; Ln=La, Nd) oxides 

      Castro-García, Socorro; Sánchez-Andújar, Manuel; Rey Cabezudo, Carlos José; Señarís-Rodríguez, M. A.; Julien, C. (Elsevier, 2001-07)
      [Abstract] We have recorded the FTIR spectra of powder samples of Ln2−xSrxCoO4 (Ln=La, Nd) at room temperature. We have identified the infrared active modes (3A2u+4Eu), and analyzed how they change as a function of Ln and ...

    • Magnetoelectric behavior in the complex CaMn7O12 perovskite 

      Sánchez-Andújar, Manuel; Yáñez Vilar, Susana; Biskup, Nevenko; Castro-García, Socorro; Mira Pérez, Jorge; Rivas Rey, José; Señarís-Rodríguez, M. A. (Elsevier, 2009)
      [Abstract] We report a magnetoelectric effect in the double perovskite CaMn7O12, that shows a complex magnetic behavior below 90 K with two magnetic phases coexisting (one ferrimagnetic and the other modulated). A second ...

    • Narrowing the Tolerance Factor Limits for Hybrid Organic-Inorganic Dicyanamide-Perovskites 

      García Ben, Javier; García-Fernández, Alberto; Dafonte Rodríguez, Pedro; Delgado Ferreiro, Ignacio; Cappel, Ute; Castro-García, Socorro; Sánchez-Andújar, Manuel; Bermúdez-García, Juan Manuel; Señarís-Rodríguez, M. A. (Elsevier, 2022-10-11)
      [Abstract] In this work we focus in setting the limits of the tolerance factor and the size of the A-cations that stabilize the perovskite structure in hybrid dicyanamide compounds [A][Mn(dca)3]. For this purpose, we propose ...

    • Near Room Temperature Dielectric Transition in the Perovskite Formate Framework [(CH₃)₂NH₂][Mg(HCOO)₃] 

      Pato Doldán, Breogán; Sánchez-Andújar, Manuel; Gómez Aguirre, Lilián Claudia; Yáñez Vilar, Susana; López-Beceiro, Jorge; Gracia Fernández, Carlos; Haghighirad, A. A.; Ritter, F.; Castro-García, Socorro; Señarís-Rodríguez, M. A. (The Royal Society of Chemistry, 2012-05)
      [Abstract] We report that the hybrid organic–inorganic compound [(CH₃)₂NH₂][Mg(HCOO)₃] shows a marked dielectric transition around Tₜ ∼ 270 K, associated to a structural phase transition from SG R[3 with combining macron]c ...

    • Near-Room-Temperature Reversible Giant Barocaloric Effects in [(CH₃)₄N]Mn[N₃]₃ Hybrid Perovskite 

      Salgado-Beceiro, Jorge; Silva, Ariel Nonato Almeida de Abreu; Silva, Rosivaldo Xavier da; García-Fernández, Alberto; Sánchez-Andújar, Manuel; Castro-García, Socorro; Stern-Taulats, Enric; Señarís-Rodríguez, M. A.; Moya, Xavier; Bermúdez-García, Juan Manuel (Royal Society of Chemistry, 2020-09-25)
      [Abstract] We report giant reversible barocaloric effects in [(CH₃)₄N]Mn[N₃]₃ hybrid organic–inorganic perovskite, near its first-order cubic-monoclinic structural phase transition at 𝑇₀ ∼ 305 K. When driving the transition ...

    • Peculiarities in the electrical and magnetic properties of cobalt perovskites Ln1−xMxCoO3 (Ln3+: La3+, M2+: Ca2+, Sr2+, Ba2+; Ln3+: Nd3+, M2+: Sr2+) 

      Señarís-Rodríguez, M. A.; Breijo, M.P.; Castro-García, Socorro; Rey Cabezudo, Carlos José; Sánchez, M.; Sánchez, R.D.; Mira Pérez, Jorge; Fondado Fondado, Alfonso; Rivas Rey, José (Elsevier, 1999-09)
      We refer here to the electrical and magnetic properties of the Ln1−xMxCoO3 systems (Ln3+: La3+, M2+: Ca2+, Sr2+, Ba2+; Ln3+: Nd3+, M2+: Sr2+), paying special attention to those ferromagnetic compounds that display M–I ...

    • Raman Spectroscopy Studies on the Barocaloric Hybrid Perovskite [(CH₃)₄N][Cd(N₃)₃] 

      Silva, Rosivaldo Xavier da; Paschoal, Carlos William de Araujo; Santos, Clenilton; García-Fernández, Alberto; Salgado-Beceiro, Jorge; Señarís-Rodríguez, M. A.; Sánchez-Andújar, Manuel; Silva, Ariel Nonato Almeida de Abreu (MDPI, 2020-10-16)
      [Abstract] Temperature-dependent Raman scattering and differential scanning calorimetry were applied to the study of the hybrid organic-inorganic azide-perovskite [(CH₃)₄N][Cd(N₃)₃], a compound with multiple structural ...

    • Structural and electrochemical properties of Li-Ni-Co oxides synthesized by wet chemistry via a succinic-acid-assisted technique 

      Castro-García, Socorro; Julien, C.; Señarís-Rodríguez, M. A. (Elsevier, 2001)
      [Abstract] Lithiated metal oxides LiCo1−yNiyO2 were synthesized by a sol–gel method using succinic acid as chelating agent. Microcrystalline materials were formed by calcination in oxygen at 800°C. The physicochemical ...

    • Studies on the power factor of (Ba,Sr)Co2+xRu4−xO11 compounds 

      Pato Doldán, Breogán; Sánchez-Andújar, Manuel; Castro-García, Socorro; Señarís-Rodríguez, M. A. (Elsevier, 2011-02)
      [Abstract] We have prepared polycrystalline single-phase ACo2+xRu4−xO11 (A = Sr, Ba; 0 ≤ x ≤ 0.5) using the ceramic method and we have studied their structure, electrical resistivity and Seebeck coefficient, in order to ...