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Introduction                                                 Results                                                  Conc...
Introduction                                       Results   ConclusionsOutline         1     Introduction                ...
Introduction                                              Results   ConclusionsMagnetocaloric EffectThe Magnetic Entropy C...
Introduction                                              Results                                                Conclusio...
Introduction                                           Results                ConclusionsImproving the Relative Cooling Po...
Introduction                                            Results                                                    Conclus...
Introduction                                            Results                                                      Concl...
Introduction                                  Results                      ConclusionsFeZrBCu amorphous alloysNanoperm All...
Introduction                                               Results                      ConclusionsFeZrBCu amorphous alloy...
Introduction                                   Results                      ConclusionsAdvantagesAdvantages of FeZrBCu all...
Introduction                                   Results                               ConclusionsAdvantagesAdvantages of Fe...
Introduction                                    Results                               ConclusionsAdvantagesAdvantages of F...
Introduction                                    Results                               ConclusionsAdvantagesAdvantages of F...
Introduction                                    Results                               ConclusionsAdvantagesAdvantages of F...
Introduction                                       Results   ConclusionsMagnetocaloric PropertiesMagnetic Entropy Change  ...
Introduction                                       Results   ConclusionsMagnetocaloric PropertiesMagnetic Entropy Change  ...
Introduction                           Results                                  ConclusionsMagnetocaloric PropertiesTypica...
Introduction                           Results                                  ConclusionsMagnetocaloric PropertiesTypica...
Introduction                                    Results                  ConclusionsCombined SystemA Concrete Two-Phase Co...
Introduction                                    Results                                 ConclusionsCombined SystemA Concre...
Introduction                                          Results            ConclusionsCombined SystemA Concrete Two-Phase Co...
Introduction                                          Results                                             ConclusionsCombi...
Introduction                                          Results                                                 ConclusionsC...
Introduction                                 Results                       ConclusionsCombined SystemFlattening of the ∆SM...
Introduction                                 Results                       ConclusionsCombined SystemFlattening of the ∆SM...
Introduction                             Results                          ConclusionsConclusions         In this contribut...
Introduction                             Results                          ConclusionsConclusions         In this contribut...
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Enhancing the working temperature span and refrigerant capacity of two-phase composite systems based on amorphous FeZrBCu ribbons

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Presentation in the ISMANAM'11 conference held in Gijon (Spain)

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Enhancing the working temperature span and refrigerant capacity of two-phase composite systems based on amorphous FeZrBCu ribbons

  1. 1. Introduction Results Conclusions Enhancing the working temperature span and refrigerant capacity of two-phase composite systems based on amorphous FeZrBCu ribbons P. Alvarez1 J.L. Sánchez-Llamazares2 P. Gorria1 J.A. Blanco1 1 University of Oviedo, Spain 2 Instituto Potosino de Investigación Científica y Tecnológica, Mexico International Symposium on Metastable, Amorphous and Nanostructured Materials
  2. 2. Introduction Results ConclusionsOutline 1 Introduction Magnetocaloric Effect Improving the Relative Cooling Power 2 Results Magnetocaloric Properties Combined System 3 Conclusions
  3. 3. Introduction Results ConclusionsMagnetocaloric EffectThe Magnetic Entropy Change and the Relative Cooling Power Temperature dependence of Magnetization for GdAl2 and its relation with the MCE Maxwell Relation Isothermal Magnetic Entropy Change H2 ∂M ∆S (T , H2 )P,∆H = dH H1 ∂T P,H
  4. 4. Introduction Results ConclusionsMagnetocaloric EffectThe Magnetic Entropy Change and the Relative Cooling Power Temperature dependence of Relative Cooling Power (RCP) Magnetization for GdAl2 and its relation with the MCE Estimation of RCP Peak Maxwell Relation RCP1 (H) = |∆SM (H) | × δTFWHM TH Isothermal Magnetic Entropy Change RCP2 (H) = |∆SM (T , H)| dT . TC H2 ∂M ∆S (T , H2 )P,∆H = dH RCP3 (H) = max ∆Smag (T1 , H) × (T2 − T1 ) H1 ∂T P,H
  5. 5. Introduction Results ConclusionsImproving the Relative Cooling PowerComposite Compounds: an Effective way to Improve the RCP via the ∆SM (T ) Broadening Past: Low Temperature Magnetic Composites T. Hashimoto et al., J. Appl. Phys. 62 (9) (1987) 3873-3878
  6. 6. Introduction Results ConclusionsImproving the Relative Cooling PowerComposite Compounds: an Effective way to Improve the RCP via the ∆SM (T ) Broadening Past: Low Temperature Recent: RCP Improvement around RT by Magnetic Composites Using Magnetic Composites T. Hashimoto et al., J. Appl. Phys. 62 (9) (1987) 3873-3878 R. Caballero-Flores et al., Appl. Phys. Lett. 98 (2011) 102505
  7. 7. Introduction Results ConclusionsImproving the Relative Cooling PowerComposite Compounds: an Effective way to Improve the RCP via the ∆SM (T ) Broadening Past: Low Temperature Recent: RCP Improvement around RT by Magnetic Composites Using Magnetic Composites T. Hashimoto et al., J. Appl. Phys. 62 (9) (1987) 3873-3878 R. Caballero-Flores et al., Appl. Phys. Lett. 98 (2011) 102505 Further Comments RCP Optimization for a Two-Phase Magnetic Composite The Maximum Refrigeration Efficiency is attained with Constant Magnetic Entropy Shape of ∆SM (T ) Change curves. δTC A.M. Tishin and Y.I. Spichkin. Magnetocaloric Effect Weight Fraction of Both Phases and Its Applications. Series in Condensed Matter Physics, 1 edition (2003). Applied Magnetic Field
  8. 8. Introduction Results ConclusionsFeZrBCu amorphous alloysNanoperm Alloys ∆SM (T ) for Nanoperm alloys P. Alvarez et al., Intermetallics 18 (2010) 2464-2467
  9. 9. Introduction Results ConclusionsFeZrBCu amorphous alloysNanoperm Alloys ∆SM (T ) for Nanoperm alloys P. Alvarez et al., Intermetallics 18 (2010) 2464-2467 FeZrBCu Amorphous Alloys Produced Fe90 Zr10 - Fe90 Zr9 B1 - Fe91 Zr7 B2 - Fe90 Zr8 B2 Fe88 Zr8 B4 - Fe86 Zr7 B6 Cu1 - Fe87 Zr6 B6 Cu1 Arc-melting Bulk alloy → Melt-spinning → Amorphous Ribbons
  10. 10. Introduction Results ConclusionsAdvantagesAdvantages of FeZrBCu alloys for their use in Two-Phase Composite Systems Advantages Easy to produce (Melt spinning technique) Low Cost (Fe-Based alloys) Large MS values Second Order Magnetic Phase Transition Tunable TC in a wide range Broad ∆SM (T ) curves
  11. 11. Introduction Results ConclusionsAdvantagesAdvantages of FeZrBCu alloys for their use in Two-Phase Composite Systems Advantages Magnetization Isotherms Easy to produce (Melt spinning technique) Low Cost (Fe-Based alloys) Large MS values Second Order Magnetic Phase Transition Tunable TC in a wide range MS ≈ 125 − 135 emu g−1 Broad ∆SM (T ) curves
  12. 12. Introduction Results ConclusionsAdvantagesAdvantages of FeZrBCu alloys for their use in Two-Phase Composite Systems Advantages Magnetization Isotherms Easy to produce (Melt spinning technique) Low Cost (Fe-Based alloys) Large MS values Second Order Magnetic Phase Transition Tunable TC in a wide range MS ≈ 125 − 135 emu g−1 Broad ∆SM (T ) curves Typical Arrott Plot
  13. 13. Introduction Results ConclusionsAdvantagesAdvantages of FeZrBCu alloys for their use in Two-Phase Composite Systems Advantages Magnetization Isotherms Easy to produce (Melt spinning technique) Low Cost (Fe-Based alloys) Large MS values Second Order Magnetic Phase Transition Tunable TC in a wide range MS ≈ 125 − 135 emu g−1 Broad ∆SM (T ) curves TC vs Fe Content Typical Arrott Plot
  14. 14. Introduction Results ConclusionsAdvantagesAdvantages of FeZrBCu alloys for their use in Two-Phase Composite Systems Advantages Magnetization Isotherms Easy to produce (Melt spinning technique) Low Cost (Fe-Based alloys) Large MS values Second Order Magnetic Phase Transition Tunable TC in a wide range MS ≈ 125 − 135 emu g−1 Broad ∆SM (T ) curves TC vs Fe Content Typical Arrott Plot
  15. 15. Introduction Results ConclusionsMagnetocaloric PropertiesMagnetic Entropy Change A general view to ∆SM (T ) curves for amorphous FeZrCuB alloys
  16. 16. Introduction Results ConclusionsMagnetocaloric PropertiesMagnetic Entropy Change A general view to ∆SM (T ) curves for amorphous FeZrCuB alloys
  17. 17. Introduction Results ConclusionsMagnetocaloric PropertiesTypical RCP and δTFWHM values of amorphous FeZrCuB alloys RCP-1 Metallic Gd RCP1(µ0 H = 5 T) = 687 Jkg−1 RCP2(µ0 H = 5 T) = 503 Jkg−1 RCP-2
  18. 18. Introduction Results ConclusionsMagnetocaloric PropertiesTypical RCP and δTFWHM values of amorphous FeZrCuB alloys RCP-1 Metallic Gd RCP1(µ0 H = 5 T) = 687 Jkg−1 RCP2(µ0 H = 5 T) = 503 Jkg−1 Width of the ∆SM (T ) Curves RCP-2
  19. 19. Introduction Results ConclusionsCombined SystemA Concrete Two-Phase Composite based on amorphous FeZrCuB ribbons: EXAMPLE 1 ∆SM (T ) curves of Component A (Fe90 Zr9 B1 ) and B (Fe87 Zr6 B6 Cu1 )
  20. 20. Introduction Results ConclusionsCombined SystemA Concrete Two-Phase Composite based on amorphous FeZrCuB ribbons: EXAMPLE 1 ∆SM (T ) curves of Component ∆SM (T ) curves of the Composite System A (Fe90 Zr9 B1 ) and B (Fe87 Zr6 B6 Cu1 ) 0.4 A + 0.6 B
  21. 21. Introduction Results ConclusionsCombined SystemA Concrete Two-Phase Composite based on amorphous FeZrCuB ribbons: EXAMPLE 2 ∆SM (T ) for the two-ribbon system 0.5 A (Fe87 Zr6 B6 Cu1 ) + 0.5 B (Fe90 Zr8 B2 )
  22. 22. Introduction Results ConclusionsCombined SystemA Concrete Two-Phase Composite based on amorphous FeZrCuB ribbons: EXAMPLE 2 Increase of δTFWHM for the Two-Phase System 0.5 A (Fe87 Zr6 B6 Cu1 ) + 0.5 B (Fe90 Zr8 B2 ) ∆SM (T ) for the two-ribbon system 0.5 A (Fe87 Zr6 B6 Cu1 ) + 0.5 B (Fe90 Zr8 B2 )
  23. 23. Introduction Results ConclusionsCombined SystemA Concrete Two-Phase Composite based on amorphous FeZrCuB ribbons: EXAMPLE 2 Increase of δTFWHM for the Two-Phase System 0.5 A (Fe87 Zr6 B6 Cu1 ) + 0.5 B (Fe90 Zr8 B2 ) ∆SM (T ) for the two-ribbon system 0.5 A (Fe87 Zr6 B6 Cu1 ) + 0.5 B (Fe90 Zr8 B2 ) Resulting RCP for the Two-Phase System 0.5 A (Fe87 Zr6 B6 Cu1 ) + 0.5 B (Fe90 Zr8 B2 ) RCP ≈ 95% of Metallic Gd
  24. 24. Introduction Results ConclusionsCombined SystemFlattening of the ∆SM (T ) Curve Flattening of ∆SM (T ) for the system 0.5 A (Fe87 Zr6 B6 Cu1 ) + 0.5 B (Fe90 Zr8 B2 )
  25. 25. Introduction Results ConclusionsCombined SystemFlattening of the ∆SM (T ) Curve Flattening of ∆SM (T ) for the system 0.5 A (Fe87 Zr6 B6 Cu1 ) + 0.5 B (Fe90 Zr8 B2 )
  26. 26. Introduction Results ConclusionsConclusions In this contribution we experimentally show that a combination of two Nanoperm amorphous ribbons forming a two-phase composite system may lead to: A considerably increase of the δTFWHM with the consequent enhancement in the RCP; A Flattening of the ∆SM (T ) curve which improves the refrigerant efficiency of the refrigerant thermodynamic cycle. The latter is possible due to the broad ∆SM (T ) curve shown by Nanoperm alloys and their combination in a proper way (i.e, the right selection of both, the δTC of the two alloys chosen to form the composite, and the relative weight fraction).
  27. 27. Introduction Results ConclusionsConclusions In this contribution we experimentally show that a combination of two Nanoperm amorphous ribbons forming a two-phase composite system may lead to: A considerably increase of the δTFWHM with the consequent enhancement in the RCP; A Flattening of the ∆SM (T ) curve which improves the refrigerant efficiency of the refrigerant thermodynamic cycle. The latter is possible due to the broad ∆SM (T ) curve shown by Nanoperm alloys and their combination in a proper way (i.e, the right selection of both, the δTC of the two alloys chosen to form the composite, and the relative weight fraction). THANKS FOR YOUR ATTENTION!

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