Enhancing the working temperature span and refrigerant capacity of two-phase composite systems...
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Introduction Results Conclusions Enhancing the working temperature span and refrigerant capacity of two-phase composite systems based on amorphous FeZrBCu ribbons P. Alvarez 1 J.L. Sánchez-Llamazares 2 P. Gorria 1 J.A. Blanco 1 1 University of Oviedo, Spain 2 Instituto Potosino de Investigación Científica y Tecnológica, Mexico International Symposium on Metastable, Amorphous and Nanostructured Materials
description
Presentation in the ISMANAM'11 conference held in Gijon (Spain)
Transcript of Enhancing the working temperature span and refrigerant capacity of two-phase composite systems...
Introduction Results Conclusions
Enhancing the working temperature span and refrigerantcapacity of two-phase composite systems based on
amorphous FeZrBCu ribbons
P. Alvarez1 J.L. Sánchez-Llamazares2 P. Gorria1 J.A. Blanco1
1University of Oviedo, Spain2Instituto Potosino de Investigación Científica y Tecnológica, Mexico
International Symposium on Metastable, Amorphous and NanostructuredMaterials
Introduction Results Conclusions
Outline
1 IntroductionMagnetocaloric EffectImproving the Relative Cooling Power
2 ResultsMagnetocaloric PropertiesCombined System
3 Conclusions
Introduction Results Conclusions
Magnetocaloric Effect
The Magnetic Entropy Change and the Relative Cooling Power
Temperature dependence ofMagnetization for GdAl2 and itsrelation with the MCE
Maxwell Relation
Isothermal Magnetic Entropy Change
∆S (T ,H2)P,∆H =
∫ H2
H1
(∂M∂T
)P,H
dH
Relative Cooling Power (RCP)
Estimation of RCP
RCP1(H) = |∆SPeakM (H) | × δTFWHM
RCP2(H) =
∫ TH
TC|∆SM (T ,H)| dT .
RCP3(H) = max{∣∣∆Smag (T1,H)
∣∣× (T2 − T1)}
Introduction Results Conclusions
Magnetocaloric Effect
The Magnetic Entropy Change and the Relative Cooling Power
Temperature dependence ofMagnetization for GdAl2 and itsrelation with the MCE
Maxwell Relation
Isothermal Magnetic Entropy Change
∆S (T ,H2)P,∆H =
∫ H2
H1
(∂M∂T
)P,H
dH
Relative Cooling Power (RCP)
Estimation of RCP
RCP1(H) = |∆SPeakM (H) | × δTFWHM
RCP2(H) =
∫ TH
TC|∆SM (T ,H)| dT .
RCP3(H) = max{∣∣∆Smag (T1,H)
∣∣× (T2 − T1)}
Introduction Results Conclusions
Improving the Relative Cooling Power
Composite Compounds: an Effective way to Improve the RCP via the ∆SM (T ) Broadening
Past: Low TemperatureMagnetic Composites
T. Hashimoto et al., J. Appl. Phys. 62 (9)(1987) 3873-3878
Recent: RCP Improvement around RT byUsing Magnetic Composites
R. Caballero-Flores et al., Appl. Phys. Lett. 98 (2011) 102505
Further Comments
RCP Optimization for a Two-PhaseMagnetic Composite
Shape of ∆SM (T )
δTC
Weight Fraction of Both Phases
Applied Magnetic Field
The Maximum Refrigeration Efficiency isattained with Constant Magnetic EntropyChange curves.
A.M. Tishin and Y.I. Spichkin. Magnetocaloric Effectand Its Applications. Series in Condensed MatterPhysics, 1 edition (2003).
Introduction Results Conclusions
Improving the Relative Cooling Power
Composite Compounds: an Effective way to Improve the RCP via the ∆SM (T ) Broadening
Past: Low TemperatureMagnetic Composites
T. Hashimoto et al., J. Appl. Phys. 62 (9)(1987) 3873-3878
Recent: RCP Improvement around RT byUsing Magnetic Composites
R. Caballero-Flores et al., Appl. Phys. Lett. 98 (2011) 102505
Further Comments
RCP Optimization for a Two-PhaseMagnetic Composite
Shape of ∆SM (T )
δTC
Weight Fraction of Both Phases
Applied Magnetic Field
The Maximum Refrigeration Efficiency isattained with Constant Magnetic EntropyChange curves.
A.M. Tishin and Y.I. Spichkin. Magnetocaloric Effectand Its Applications. Series in Condensed MatterPhysics, 1 edition (2003).
Introduction Results Conclusions
Improving the Relative Cooling Power
Composite Compounds: an Effective way to Improve the RCP via the ∆SM (T ) Broadening
Past: Low TemperatureMagnetic Composites
T. Hashimoto et al., J. Appl. Phys. 62 (9)(1987) 3873-3878
Recent: RCP Improvement around RT byUsing Magnetic Composites
R. Caballero-Flores et al., Appl. Phys. Lett. 98 (2011) 102505
Further Comments
RCP Optimization for a Two-PhaseMagnetic Composite
Shape of ∆SM (T )
δTC
Weight Fraction of Both Phases
Applied Magnetic Field
The Maximum Refrigeration Efficiency isattained with Constant Magnetic EntropyChange curves.
A.M. Tishin and Y.I. Spichkin. Magnetocaloric Effectand Its Applications. Series in Condensed MatterPhysics, 1 edition (2003).
Introduction Results Conclusions
FeZrBCu amorphous alloys
Nanoperm Alloys
∆SM (T ) for Nanoperm alloys
P. Alvarez et al., Intermetallics 18 (2010)2464-2467
FeZrBCu Amorphous Alloys Produced
Fe90Zr10 - Fe90Zr9B1 - Fe91Zr7B2 - Fe90Zr8B2
Fe88Zr8B4 - Fe86Zr7B6Cu1 - Fe87Zr6B6Cu1
Arc-melting Bulk alloy→ Melt-spinning→ Amorphous Ribbons
Introduction Results Conclusions
FeZrBCu amorphous alloys
Nanoperm Alloys
∆SM (T ) for Nanoperm alloys
P. Alvarez et al., Intermetallics 18 (2010)2464-2467
FeZrBCu Amorphous Alloys Produced
Fe90Zr10 - Fe90Zr9B1 - Fe91Zr7B2 - Fe90Zr8B2
Fe88Zr8B4 - Fe86Zr7B6Cu1 - Fe87Zr6B6Cu1
Arc-melting Bulk alloy→ Melt-spinning→ Amorphous Ribbons
Introduction Results Conclusions
Advantages
Advantages of FeZrBCu alloys for their use in Two-Phase Composite Systems
Advantages
Easy to produce (Meltspinning technique)
Low Cost (Fe-Basedalloys)
Large MS values
Second Order MagneticPhase Transition
Tunable TC in a wide range
Broad ∆SM (T ) curves
Magnetization Isotherms
MS ≈ 125 − 135 emu g−1
Typical Arrott PlotTC vs Fe Content
Introduction Results Conclusions
Advantages
Advantages of FeZrBCu alloys for their use in Two-Phase Composite Systems
Advantages
Easy to produce (Meltspinning technique)
Low Cost (Fe-Basedalloys)
Large MS values
Second Order MagneticPhase Transition
Tunable TC in a wide range
Broad ∆SM (T ) curves
Magnetization Isotherms
MS ≈ 125 − 135 emu g−1
Typical Arrott PlotTC vs Fe Content
Introduction Results Conclusions
Advantages
Advantages of FeZrBCu alloys for their use in Two-Phase Composite Systems
Advantages
Easy to produce (Meltspinning technique)
Low Cost (Fe-Basedalloys)
Large MS values
Second Order MagneticPhase Transition
Tunable TC in a wide range
Broad ∆SM (T ) curves
Magnetization Isotherms
MS ≈ 125 − 135 emu g−1
Typical Arrott Plot
TC vs Fe Content
Introduction Results Conclusions
Advantages
Advantages of FeZrBCu alloys for their use in Two-Phase Composite Systems
Advantages
Easy to produce (Meltspinning technique)
Low Cost (Fe-Basedalloys)
Large MS values
Second Order MagneticPhase Transition
Tunable TC in a wide range
Broad ∆SM (T ) curves
Magnetization Isotherms
MS ≈ 125 − 135 emu g−1
Typical Arrott PlotTC vs Fe Content
Introduction Results Conclusions
Advantages
Advantages of FeZrBCu alloys for their use in Two-Phase Composite Systems
Advantages
Easy to produce (Meltspinning technique)
Low Cost (Fe-Basedalloys)
Large MS values
Second Order MagneticPhase Transition
Tunable TC in a wide range
Broad ∆SM (T ) curves
Magnetization Isotherms
MS ≈ 125 − 135 emu g−1
Typical Arrott PlotTC vs Fe Content
Introduction Results Conclusions
Magnetocaloric Properties
Magnetic Entropy Change
A general view to ∆SM (T ) curvesfor amorphous FeZrCuB alloys
Introduction Results Conclusions
Magnetocaloric Properties
Magnetic Entropy Change
A general view to ∆SM (T ) curvesfor amorphous FeZrCuB alloys
Introduction Results Conclusions
Magnetocaloric Properties
Typical RCP and δTFWHM values of amorphous FeZrCuB alloys
RCP-1
RCP-2
Metallic Gd
RCP1(µ0H = 5 T) = 687 Jkg−1
RCP2(µ0H = 5 T) = 503 Jkg−1
Width of the ∆SM (T ) Curves
Introduction Results Conclusions
Magnetocaloric Properties
Typical RCP and δTFWHM values of amorphous FeZrCuB alloys
RCP-1
RCP-2
Metallic Gd
RCP1(µ0H = 5 T) = 687 Jkg−1
RCP2(µ0H = 5 T) = 503 Jkg−1
Width of the ∆SM (T ) Curves
Introduction Results Conclusions
Combined System
A Concrete Two-Phase Composite based on amorphous FeZrCuB ribbons: EXAMPLE 1
∆SM (T ) curves of ComponentA (Fe90Zr9B1) and B (Fe87Zr6B6Cu1)
∆SM (T ) curves of the Composite System0.4 A + 0.6 B
Introduction Results Conclusions
Combined System
A Concrete Two-Phase Composite based on amorphous FeZrCuB ribbons: EXAMPLE 1
∆SM (T ) curves of ComponentA (Fe90Zr9B1) and B (Fe87Zr6B6Cu1)
∆SM (T ) curves of the Composite System0.4 A + 0.6 B
Introduction Results Conclusions
Combined System
A Concrete Two-Phase Composite based on amorphous FeZrCuB ribbons: EXAMPLE 2
∆SM (T ) for the two-ribbon system0.5 A (Fe87Zr6B6Cu1) + 0.5 B (Fe90Zr8B2)
Increase of δTFWHM for the Two-Phase System0.5 A (Fe87Zr6B6Cu1) + 0.5 B (Fe90Zr8B2)
Resulting RCP for the Two-Phase System0.5 A (Fe87Zr6B6Cu1) + 0.5 B (Fe90Zr8B2)
RCP ≈ 95% of Metallic Gd
Introduction Results Conclusions
Combined System
A Concrete Two-Phase Composite based on amorphous FeZrCuB ribbons: EXAMPLE 2
∆SM (T ) for the two-ribbon system0.5 A (Fe87Zr6B6Cu1) + 0.5 B (Fe90Zr8B2)
Increase of δTFWHM for the Two-Phase System0.5 A (Fe87Zr6B6Cu1) + 0.5 B (Fe90Zr8B2)
Resulting RCP for the Two-Phase System0.5 A (Fe87Zr6B6Cu1) + 0.5 B (Fe90Zr8B2)
RCP ≈ 95% of Metallic Gd
Introduction Results Conclusions
Combined System
A Concrete Two-Phase Composite based on amorphous FeZrCuB ribbons: EXAMPLE 2
∆SM (T ) for the two-ribbon system0.5 A (Fe87Zr6B6Cu1) + 0.5 B (Fe90Zr8B2)
Increase of δTFWHM for the Two-Phase System0.5 A (Fe87Zr6B6Cu1) + 0.5 B (Fe90Zr8B2)
Resulting RCP for the Two-Phase System0.5 A (Fe87Zr6B6Cu1) + 0.5 B (Fe90Zr8B2)
RCP ≈ 95% of Metallic Gd
Introduction Results Conclusions
Combined System
Flattening of the ∆SM (T ) Curve
Flattening of ∆SM (T ) for the system0.5 A (Fe87Zr6B6Cu1) + 0.5 B (Fe90Zr8B2)
Introduction Results Conclusions
Combined System
Flattening of the ∆SM (T ) Curve
Flattening of ∆SM (T ) for the system0.5 A (Fe87Zr6B6Cu1) + 0.5 B (Fe90Zr8B2)
Introduction Results Conclusions
Conclusions
In this contribution we experimentally show that a combinationof two Nanoperm amorphous ribbons forming a two-phasecomposite system may lead to:
A considerably increase of the δTFWHM with the consequentenhancement in the RCP;
A Flattening of the ∆SM(T ) curve which improves therefrigerant efficiency of the refrigerant thermodynamic cycle.
The latter is possible due to the broad ∆SM(T ) curve shown byNanoperm alloys and their combination in a proper way (i.e, theright selection of both, the δTC of the two alloys chosen to formthe composite, and the relative weight fraction).
THANKS FOR YOUR ATTENTION!
Introduction Results Conclusions
Conclusions
In this contribution we experimentally show that a combinationof two Nanoperm amorphous ribbons forming a two-phasecomposite system may lead to:
A considerably increase of the δTFWHM with the consequentenhancement in the RCP;
A Flattening of the ∆SM(T ) curve which improves therefrigerant efficiency of the refrigerant thermodynamic cycle.
The latter is possible due to the broad ∆SM(T ) curve shown byNanoperm alloys and their combination in a proper way (i.e, theright selection of both, the δTC of the two alloys chosen to formthe composite, and the relative weight fraction).
THANKS FOR YOUR ATTENTION!
