Influence of microstructural defects on the martensitic transformation and on the magnetic properties of ni-based heusler alloys

• Autores: Iraultza Unzueta Solozabal
• Directores de la Tesis: Fernando Plazaola Muguruza (dir. tes.), José Ángel García Martínez (dir. tes.)
• Lectura: En la Universidad del País Vasco - Euskal Herriko Unibertsitatea ( España ) en 2019
• Idioma: inglés
• Títulos paralelos:
  • Mikroegiturako akatsek, ni-oinarridun heusler aleazioen transformazio martensitikoan eta propietate magnetikoetan duten eraginaren azterketaa
• Tribunal Calificador de la Tesis: José Manuel Barandiarán García (presid.), José Ignacio Pérez de Landazábal (secret.), Roberto Mantovani (voc.)
• Programa de doctorado: Programa de Doctorado en Física por la Universidad del País Vasco/Euskal Herriko Unibertsitatea
• Materias:
  • Física
    • Física del estado sólido
      • Aleaciones
      • Imperfecciones
      • Interacción de la radiación con los sólidos
• Enlaces
  • Tesis en acceso abierto en: ADDI
• Resumen

  • The thesis deals with the effect that microstructural defects have on the magneticproperties and martensitic transformation in Ni-Mn-Z (Z = Ga, In, Sn)and Ni-Fe-Ga alloys. For this purpose, along with the standard characterizationtechniques, two additional specific nuclear techniques have been employed; 119SnMössbauer Spectroscopy and Positron Annihilation Lifetime Spectroscopy, PALS.For the consecution of this thesis one PALS spectrometer has been designed, builtand optimized. For offline emission Mössbuauer experiments, a setup has been alsobuilt for measuring ion implanted samples. Finally, a high temperature annealingfurnace has been designed and built to carry out the annealing of powdered samplesunder controllable atmosphere. // The thesis deals with the effect that microstructural defects have on the magneticproperties and martensitic transformation in Ni-Mn-Z (Z = Ga, In, Sn)and Ni-Fe-Ga alloys. For this purpose, along with the standard characterizationtechniques, two additional specific nuclear techniques have been employed; 119SnMössbauer Spectroscopy and Positron Annihilation Lifetime Spectroscopy, PALS.For the consecution of this thesis one PALS spectrometer has been designed, builtand optimized. For offline emission Mössbuauer experiments, a setup has been alsobuilt for measuring ion implanted samples. Finally, a high temperature annealingfurnace has been designed and built to carry out the annealing of powdered samplesunder controllable atmosphere.