Repositorio IPICyT: Envíos recientes

Mostrando ítems 1421-1440 de 2301

    • Near UV-blue excitable green-emitting nanocrystalline oxide 

      Rodríguez García, Carlos Eduardo; Perea López, Néstor; Hirata Flores, Gustavo Alonso (Hindawi, 2011)
      "Green-emitting Eu-activated powders were produced by a two-stage method consisting of pressure-assisted combustion synthesis and postannealing in ammonia. The as-synthesized powders exhibited a red photoluminescence (PL) ...

    • Magnetic entropy table-like shape in RNi2 composites for cryogenic refrigeration 

      Ibarra Gaytán, Pablo Jesús; Sánchez Llamazares, José Luis; Álvarez Alonso, Pablo; Sánchez Valdés, Cesar Fidel; Gorria, Pedro; Blanco Rodríguez, Jesús Angel (2015-05)
      "We have investigated the magnetocaloric (MC) effect in a two-phase composite based on melt-spun ribbons of the intermetallic DyNi2 and TbNi2 Laves phases. The temperature dependence of the isothermal magnetic entropy ...

    • Magnetocaloric properties of rapidly solidified Dy3Co alloy ribbons 

      Sánchez Llamazares, José Luis; Flores Zúñiga, Horacio; Álvarez Alonso, Pablo; Sánchez Valdés, Cesar Fidel; Lara Rodríguez, Gabriel Ángel; Fernández-Gubieda Ruiz, María Luisa (2015-05)
      "The magnetic and magnetocaloric (MC) properties of melt-spun ribbons of the Dy3Co intermetallic compound were investigated. Samples were fabricated in an Ar environment using a homemade melt spinner system at a linear ...

    • High-magnetic field characterization of magnetocaloric effect in FeZrB(Cu) amorphous ribbons 

      Álvarez Alonso, Pablo; Sánchez Llamazares, José Luis; Sánchez Valdés, Cesar Fidel; Fernández-Gubieda Ruiz, María Luisa; Gorria, Pedro; Blanco Rodríguez, Jesús Angel (2015-05)
      "The magnetic and magnetocaloric properties of a series of Fe-rich FeZrB(Cu) amorphous ribbons were investigated under magnetic field values up to mu H-0 of 8 T. A correlation between the saturation magnetization and the ...

    • Magnetostructural transition and magnetocaloric effect in MnNiGe1.05 melt-spun ribbons 

      Daniel Pérez, Gerardo; Sánchez Llamazares, José Luis; Quintana Nedelcos, Aris; Álvarez Alonso, Pablo; Chernenko, Volodymyr (2014-05)
      "Alloy ribbons of nominal composition MnNiGe1.05 were produced using the melt-spinning technique. As-quenched (aq) polycrystalline ribbons are single-phase showing the hexagonal Ni2In-type crystal structure. After thermal ...

    • On the broadening of the magnetic entropy change due to Curie temperature distribution 

      Álvarez Alonso, Pablo; Sánchez Llamazares, José Luis; Sánchez Valdés, Cesar Fidel; Cuello, Gabriel J.; Franco, Victorino; Gorria, Pedro; Blanco Rodríguez, Jesús Angel (2014-05)
      "We have studied the correlation between the broadening of the isothermal magnetic entropy change and the Curie temperature (T-C) distribution in nanostructured Pr2Fe17 and Nd2Fe17 alloys produced by high-energy ball-milling ...

    • Magnetocaloric effect in the low hysteresis Ni-Mn-In metamagnetic shape-memory Heusler alloy 

      Castillo Villa, Pedro Osmany; Mañosa, Lluis; Frontera, Carlos; Majumdar, Subham; Planes, Antoni (2014-05)
      "We have studied magnetocaloric properties of a Ni-Mn-In metamagnetic shape-memory alloy especially designed in order to display low thermal hysteresis. Magnetization and calorimetric measurements under a magnetic field ...

    • Magnetic entropy change and refrigerant capacity of rapidly solidified TbNi2 alloy ribbons 

      Sánchez Llamazares, José Luis; Sánchez Valdés, Cesar Fidel; Ibarra Gaytán, Pablo Jesús; Álvarez Alonso, Pablo; Gorria, Pedro; Blanco Rodríguez, Jesús Angel (2013-05)
      "The magnetocaloric effect in TbNi2 alloy ribbons synthesized by rapid solidification was investigated. This material crystallizes in a superstructure of the cubic Laves phase structure type C15 (space group F-43m). The ...

    • Structural and magnetic characterization of the intermartensitic phase transition in NiMnSn Heusler alloy ribbons 

      Sánchez Llamazares, José Luis; Flores Zúñiga, Horacio; Ríos Jara, David; Sánchez Valdés, Cesar Fidel; García Fernández, T.; Ross, Caroline A.; Garcia, Carlos (2013-05)
      "Phase transitions and structural and magnetic properties of rapidly solidified Ni50Mn38Sn12 alloy ribbons have been studied. Ribbon samples crystallize as a single-phase, ten-layered modulated (10M) monoclinic martensite ...

    • Self consistent measurement and removal of the dipolar interaction field in magnetic particle assemblies and the determination of their intrinsic switching field distribution 

      Martínez Huerta, Juan Manuel; De la Torre Medina, Joaquín; Piraux, Luc; Encinas Oropesa, Armando (2012-04)
      "Using low density arrays of bistable magnetic nanowires as a model dipolar system, it is shown that the dipolar interaction field coefficient can be measured from the remanence curves as well as from other functions of ...

    • Elastocaloric and magnetocaloric effects in Ni-Mn-Sn(Cu) shape-memory alloy 

      Castillo Villa, Pedro Osmany; Mañosa, Lluis; Planes, Antoni; Soto-Parra, Daniel Enrique; Sánchez Llamazares, José Luis; Flores Zúñiga, Horacio; Frontera, Carlos (2013-02)
      "We have studied magnetocaloric and elastocaloric properties of a Ni-Mn-Sn(Cu) metamagnetic shape-memory alloy undergoing a magneto-structural transition (martensitic type) close to room temperature. Changes of entropy ...

    • Refrigerant capacity of austenite in as-quenched and annealed Ni51.1Mn31.2In17.7 melt spun ribbons 

      Sánchez Llamazares, José Luis; Flores Zúñiga, Horacio; Sánchez Valdés, Cesar Fidel; Ross, Caroline A.; Garcia, Carlos (2012-04)
      "The thermal dependence of the magnetic entropy change (Delta S-M(T)) and refrigerant capacity (RC) of austenite in as-quenched ribbons of chemical composition Ni51.1Mn31.2In17.7 produced by melt spinning at a high cooling ...

    • Synthesis and characterization of GaN rods prepared by ammono-chemical vapor deposition 

      Carbajal Arizaga, Gregorio Guadalupe; Chávez Hernández, Karina Viridiana; Cayetano Castro, Nicolás; Herrera Zaldívar, Manuel; García Gutiérrez, Rafael; Contreras López, Oscar Edel (2012-04)
      "GaN rods were deposited by chemical vapor deposition (CVD) onto sapphire (0 0 0 1) and amorphous quartz. The reactive Ga species in vapor the phase was formed with NH4Cl and gallium. The unidirectional growth was catalyzed ...

    • Kinetic arrest of direct and reverse martensitic transformation and exchange bias effect in Mn49.5Ni40.4In10.1 melt spun ribbons 

      Sánchez Llamazares, José Luis; Hernando, Blanca; Suñol, Joan Josep.; Garcia, Carlos; Ross, Caroline A. (2010-05)
      "Phase coexistence phenomena related to direct and reverse martensitic transformation have been studied in melt spun ribbons of the magnetic shape memory alloy Mn49.5Ni40.4In10.1. For magnetic fields above 10 kOe martensitic ...

    • Transformation behavior and inverse caloric effects in magnetic shape memory Ni44-xCuxCo6Mn39Sn11 ribbons 

      Wójcik, Anna; Maziarz, Wojciech; Szczerba, Maciej; Sikora, Marcin; Zywczak, Antoni; Aguilar Ortiz, Christian Omar; Álvarez Alonso, Pablo; Villa, Elena; Flores Zúñiga, Horacio; Cesari, Eduard; Dutkiewicz, Jan; Chernenko, Volodymyr (2017-10)
      "An influence of the Cu doping on structural, magnetic and thermoelastic properties of the Heusler Ni44-xCuxCo6Mn39Sn11 (x = 1–4 at%) ribbons has been investigated. It is found that the addition of Cu stabilizes austenite ...

    • Electrochemical and mechanical behavior in polycrystalline CoNi-Ga shape memory alloys 

      Sánchez Carrillo, Mario; Flores de los Ríos, Juan Pablo; Huape Padilla, Engelbert; Bautista Margulis, Raúl Germán; Flores Zúñiga, Horacio; Chacón Nava, José Guadalupe; Martínez Villafañe, Alberto (2014)
      "Electrochemical behavior and microstructure was studied in polycrystalline Co38.3Ni32.1Ga29.6 alloy using the electrochemical technique of polarization curves in a medium of 3.5 wt % NaCl and 0.5M H2SO4. The importance ...

    • Enhanced refrigerant capacity and magnetic entropy flattening using a two-amorphous FeZrB(Cu) composite 

      Álvarez Alonso, Pablo; Sánchez Llamazares, José Luis; Gorria, Pedro; Blanco Rodríguez, Jesús Angel (2011-12)
      "The temperature dependence of the isothermal magnetic entropy change, Delta S-M, and the magnetic field dependence of the refrigerant capacity, RC, have been investigated in a composite system xA + (1 - x) B, based on ...

    • Design of graphene electronic devices using nanoribbons of different widths 

      Gerardo Naumis; Terrones Maldonado, Mauricio; Terrones Maldonado, Humberto; Gaggero Sager, Luis Manuel (2009-10)
      "We present a simple design of a field effect transistor based on graphene nanoribbons, taking advantage of the metallic and semiconductor nature of nanoribbons with different widths. Such device could be constructed by ...

    • Large and reversible elastocaloric effect near room temperature in a Ga-doped Ni–Mn–In metamagnetic shape-memory alloy 

      Camarillo García, Juan Pablo Ramón; Aguilar Ortiz, Christian Omar; Flores Zúñiga, Horacio; Ríos Jara, David; Soto-Parra, Daniel Enrique; Stern Taulats, Enric; Mañosa, Lluis; Planes, Antoni (2017-02)
      "We report a giant elastocaloric effect near room temperature in a polycrystalline Ga-doped Ni-Mn-In ferromagnetic shape-memory alloy. The elastocaloric effect has been quantified by measuring both isothermal stress-induced ...

    • Analysis of Ostwald ripening in Ni-rich Ni–Ti alloys by diffusion couples 

      Garay Reyes, Carlos. G.; Hernández Santiago, Felipe.; Cayetano Castro, Nicolás; Martínez Sánchez, Roberto; Hernández Rivera, José Luis; Dorantes Rosales, Héctor Javier; Cruz Rivera, José de Jesús. (2014)
      "The coarsening kinetics of gamma' precipitates in Ni-rich Ni-Ti alloys are studied using a Ni-11-5 wt% Ti and pure Ni diffusion couple. The formed concentration gradient allowed to study the aging process at 1023 K (750 ...