Ara es mostren els items 1-18 de 18

  • Barocaloric and magnetocaloric effects in Fe49Rh51 

    Stern-Taulats, E.; Planes, Antoni; Lloveras Muntané, Pol Marcel; Barrio Casado, María del; Tamarit Mur, José Luis; Pramanick, Sabyasachi; Majumdar, Subham; Frontera, Carlos; Mañosa, Lluís (2014-06-06)
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    We report on calorimetry under applied hydrostatic pressure and magnetic field at the antiferromagnetic-ferromagnetic (AFM/FM) transition of Fe49Rh51. Results demonstrate the existence of a giant barocaloric effect in this ...
  • Barocaloric and magnetocaloric effects in (MnNiSi)1-x(FeCoGe)x 

    Tapas, Samanta; Lloveras Muntané, Pol Marcel; Us Saleheen, Ahmad; Lepkowski, Daniel L.; Kramer, Emily; Dubenko, Igor; Adams, Philip W.; Young, David P.; Barrio Casado, María del; Tamarit Mur, José Luis; Ali, Naushad; Stadler, Shane (2018-01-11)
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  • Criticality in the slowed-down boiling crisis at zero gravity 

    Charignon, Thomas; Lloveras Muntané, Pol Marcel; Chatain, Denis; Truskinovsky, Lev; Vives, Eduard; Beysens, Daniel; Nikolayev, Vadim (2015-05-12)
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    Boiling crisis is a transition between nucleate and film boiling. It occurs at a threshold value of the heat flux from the heater called CHF (critical heat flux). Usually, boiling crisis studies are hindered by the high ...
  • Giant barocaloric effects at low pressure in ferrielectric ammonium sulphate 

    Lloveras Muntané, Pol Marcel; Stern Taulats, Enric; Barrio Casado, María del; Tamarit Mur, José Luis; Crossley, Sam; Li, Wei; Pomjakushin, Vladimir; Planes Vila, Antoni; Mañosa Carrera, Lluis; Mathur, N.D.; Moya, Xavier (2015-11-01)
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    Caloric effects are currently under intense study due to the prospect of environment-friendly cooling applications. Most of the research is centred on large magnetocaloric effects and large electrocaloric effects, but the ...
  • Ginzburg-Landau modelling of precursor nanoscale textures in ferroelastic materials 

    Planes, Antoni; Lloveras Muntané, Pol Marcel; Castán, Teresa; Saxena, Avadh; Porta, Marcel (2012-11)
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    A Ginzburg–Landau free-energy model is proposed to study spatially inhomogeneous states that often occur as precursors of ferroelastic/martensitic transitions. Disorder is included in the harmonic coefficient of the ...
  • Glassy behavior in martensites: Interplay between elastic anisotropy and disorder in zero-field-cooling/field-cooling simulation experiments 

    Lloveras Muntané, Pol Marcel; Castán, Teresa; Porta, Marcel; Planes, Antoni; Saxena, Avadh (2009-08-17)
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    We study the combined effect of elastic anisotropy and disorder on the microstructure and thermodynamic behavior in alloys undergoing a martensitic transformation. Within a Ginzburg-Landau free-energy framework we find the ...
  • Influence of elastic anisotropy on structural nanoscale textures 

    Lloveras Muntané, Pol Marcel; Castán, Teresa; Porta, Marcel; Planes, Antoni; Saxena, Avadh (2008-04-25)
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    We study the influence of elastic anisotropy on nanoscale precursor textures that exist in some shapememory alloys and show that tweed occurs in the limit of high elastic anisotropy while a nanocluster phase-separated state ...
  • Inverse barocaloric effects in ferroelectric BaTiO3 ceramics 

    Stern-Taulats, Enric; Lloveras Muntané, Pol Marcel; Barrio Casado, María del; Defay, Emmanuel; Egilmez, Mehmet; Planes Vila, Antoni; Tamarit Mur, José Luis; Mañosa Carrera, Lluis; Mathur, N.D.; Moya Raposo, Xavier (American Institute of Physics (AIP), 2016-09-19)
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    We use calorimetry to identify pressure-driven isothermal entropy changes in ceramic samples of the prototypical ferroelectric BaTiO3. Near the structural phase transitions at ~400 K (cubic-tetragonal) and ~280 K ...
  • Melting of orientational degrees of freedom 

    Aznar Luque, Araceli; Lloveras Muntané, Pol Marcel; Barrio Casado, María del; Tamarit Mur, José Luis (2017-05)
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    We use calorimetry and dilatometry under hydrostatic pressure, X-ray powder diffraction and available literature data in a series of composition-related orientationally disordered (plastic) crystals to characterize both ...
  • Modelling magnetostructural textures in magnetic shape-memory alloys: Strain and magnetic glass behaviour 

    Lloveras Muntané, Pol Marcel; Touchagues, Gilles; Castán, Teresa; Lookman, Turab; Porta, Marcela; Saxena, Avadh; Planes Vila, Antoni (2014-10-01)
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    In this paper, we propose a model that combines a Landau free energy part and a micromagnetic free energy part aimed at describing a magnetostructural multiferroic. We show that in the limit of high-elastic anisotropy and ...
  • Modelling shape-memory effects in ferromagnetic alloys 

    Gebbia, Jonathan F.; Lloveras Muntané, Pol Marcel; Planes Vila, Antoni; Castán Vidal, Teresa; Saxena, Avadh (Springer, 2015-07-21)
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    We develop a combined Ginzburg–Landau/micromagnetic model dealing with conventional and magnetic shape-memory properties in ferromagnetic shape-memory materials. The free energy of the system is written as the sum of ...
  • Multiferroic and related hysteretic behavior in ferromagnetic shape memory alloys 

    Gebbia, Jonathan Fernando; Castán Vidal, Teresa; Lloveras Muntané, Pol Marcel; Porta Tena, Marcel; Saxena, Avadh; Planes Vila, Antoni (2017-08-29)
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    We combine a Ginzburg–Landau model for a ferroelastic transition with the theory of micromagnetism to study the magnetostructural behavior leading to multicaloric effects in ferromagnetic shape memory alloys. We analyze ...
  • Relationship between the two-component system 1-Br-adamantane + 1-Cl-adamantane and the high-pressure properties of the pure components 

    Barrio Casado, María del; Levit Valenzuela, Rafael; Lloveras Muntané, Pol Marcel; Aznar Luque, Araceli; Negrier, Philippe; Mondieig, Denise; Tamarit Mur, José Luis (2018-03-15)
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    The temperature-composition phase diagram of the two-component system 1-Br-adamantane and 1-Cl-adamantane has been determined by means of thermal analysis techniques and X-ray powder diffraction from the low-temperature ...
  • Reversible adiabatic temperature changes at the magnetocaloric and barocaloric effects in Fe49Rh51 

    Stern-Taulats, Enric; Gracia-Condal, Adrià; Planes Vila, Antoni; Lloveras Muntané, Pol Marcel; Barrio Casado, María del; Tamarit Mur, José Luis; Pramanick, Sabyasachi; Majumdar, Subham; Mañosa Carrera, Lluis (2015-10-12)
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    We report on the adiabatic temperature changes (Delta T) associated with the magnetocaloric and barocaloric effects in a Fe49Rh51 alloy, For the magnetocaloric effect, data derived from entropy curves are compared to direct ...
  • Spatially correlated disorder in self-organized precursor magnetic nanostructures 

    Porta, Marcel; Castán, Teresa; Lloveras Muntané, Pol Marcel; Planes, Antoni; Saxena, Avadh (2007-08-20)
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    We study the scaling behavior of the characteristic length of precursor magnetic nanostructures above the Curie temperature with the correlation length of quenched-in disorder. We found that the modulation length of the ...
  • Tailoring barocaloric and magnetocaloric properties in low-hysteresis magnetic shape memory alloys 

    Stern Taulats, Enric; Planes Vila, Antoni; Lloveras Muntané, Pol Marcel; Tamarit Mur, José Luis; Barrio Casado, María del; Pramanick, Sabyasachi; Majumdar, Subham; Yuce, Suheyla; Emre, Baris; Frontera Beccaria, Carlos; Mañosa Carrera, Lluis (2015-09-01)
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    We report on the barocaloric and magnetocaloric effects in a series of low-hysteresis Ni-Mn-In magnetic shape memory alloys. We show that the behaviour exhibited by several quantities that characterise these caloric effects ...
  • Thermodynamics of stress-induced ferroelastic transitions: Influence of anisotropy and disorder 

    Lloveras Muntané, Pol Marcel; Castán, Teresa; Porta, Marcel; Planes, Antoni; Saxena, Avadh (2010-06-07)
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    Stress-induced stress-strain constitutive behavior has been studied in detail in ferroelastic martensites. It has been found that the weights of the long-range anisotropic interactions and of the disorder are important ...
  • Ultrastable glasses portray similar behaviour to ordinary glasses at high pressure 

    Rodríguez-Tinoco, Cristian; Gonzalez Silveira, Marta; Barrio Casado, María del; Lloveras Muntané, Pol Marcel; Tamarit Mur, José Luis; Garden, Jean Luc; Rodríguez Viejo, Javier (Macmillan Publishers, 2016-10-03)
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    Pressure experiments provide a unique opportunity to unravel new insights into glass-forming liquids by exploring its effect on the dynamics of viscous liquids and on the evolution of the glass transition temperature. Here ...