Lluís Mañosa...Lluís Mañosa Departament ECM. Facultat de Física. Universitat de Barcelona....
Transcript of Lluís Mañosa...Lluís Mañosa Departament ECM. Facultat de Física. Universitat de Barcelona....
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Lluís MañosaDepartament ECM. Facultat de Física.
Universitat de [email protected]
Libertas perfundet omnia lucet
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Motivation:
Libertas perfundet omnia lucet
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Further (latter) motivation:
Libertas perfundet omnia lucet
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CALORIMETRY
Best suited technique to determine entropy changes at phase transitions?
Second order phase transitions
Adiabatic,Relaxational, AC calorimetry,....
Cp
First-order phase transitions
Libertas perfundet omnia lucet
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CALORIMETRY
Best suited technique to determine entropy changes at phase transitions?
Second order phase transitions
Adiabatic,Relaxational, AC calorimetry,....
Cp
First-order phase transitions
Libertas perfundet omnia lucet
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CALORIMETRY
Best suited technique to determine entropy changes at phase transitions?
Second order phase transitions
Adiabatic,Relaxational, AC calorimetry,....
Cp
First-order phase transitions
Differential Scanning Calorimetry (DSC)
Heat flux dQ/dt
Libertas perfundet omnia lucet
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Libertas perfundet omnia lucet
PURPOSE-BUILT DSC CALORIMETERS
Peltier cells.
Heat absorbed
Heat Rejected
Ther
mo
elec
tric
coo
ler
Hea
tfl
uxm
eter
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Libertas perfundet omnia lucet
A BIT OF HISTORY
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Libertas perfundet omnia lucet
THE
ORIGINS
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Libertas perfundet omnia lucet
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Libertas perfundet omnia lucet
Water freezing
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Libertas perfundet omnia lucet
DSCUNDER EXTERNAL FIELDS
MAGNETIC FIELD(Magnetocaloric effect)
ELECTRIC FIELD(Electrocaloric effect)
MECHANICAL FIELD
HYDROSTATIC PRESSURE(Barocaloric effect)
UNIAXIAL STRESS(Elastocaloric effect)
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Libertas perfundet omnia lucet
DSC Calorimetry under constant temperature (T), sweeping field ( Y ): DIRECT METHOD
dQ
/dY
H
S
(J K
-1 k
g-1)
T (K)
Computing caloric effects: Field-induced entropy change
285 290 295 300 305
0
200
400
600
800
dQ/d
T (
mW
/K)
T(K)
T0
TdQ
/dT
T
S
(J K
-1 k
g-1)
T (K)T
DSC Calorimetry under constant field ( Y ), sweeping temperature (T) : QUASI-DIRECT METHOD
S
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Libertas perfundet omnia lucet
DSC WITH MAGNETIC FIELD v1
1 Cu block2 Sensors (thermobatteries)3 Sample4 Reference5 Carbon-glass resistor (T)
16 mm
Marcos et al., Rev. Sci. Inst. 74, 4768 (2003)
T: 10 – 300 K
B: 0 – 5 T
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Libertas perfundet omnia lucet
Gd5(SixGe1-x)4
Casanova et al., Phys. Rev. B. 69, 104416 (2004)
Casanova et al., Appl. Phys. Lett. 86, 262504 (2005)
Gd5(Si0.05Ge0.95)4
Illustrative examples of thermal curves
Isofield, scanning T Isothermal, scanning H
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Libertas perfundet omnia lucet
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Pt-100 thermometer
Sample
ThermobatteriesHall probe
Libertas perfundet omnia lucet
DSC WITH MAGNETIC FIELD v2
v2.0 v2.1
T: 100 – 400 K
B: 0 – 1 T
T: 100 – 400 K
B: 0 – 6 T
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Libertas perfundet omnia lucet
Examples: Reproducibility of ∆S upon field cycling.
Ni51Mn33.4In15.6
Stern-Taulats et al. J. Appl. Phys. 115 (2014) 173907
Stern-Taulats et al. Phys. Rev. B 89 (2014) 214105
Fe49Rh51
H →
0
0 →
H
H →
0
0 →
H
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Libertas perfundet omnia lucet
OTHER (PELTIER CELL) DEVICES
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Libertas perfundet omnia lucet
OTHER (PELTIER CELL) DEVICES
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Libertas perfundet omnia lucet
OTHER DEVICES
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Libertas perfundet omnia lucet
DSC WITH ELECTRIC FIELD
ECuBaTiO3
T: 100 – 400 K
V: 0 – 2kV
Illustrative examples of thermograms
PbSc0.5Ta0.5O3
Isofield, scanning T Isothermal, scanning E
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Libertas perfundet omnia lucet
Examples
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Libertas perfundet omnia lucet
OTHER DSC WITH ELECTRIC FIELD
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Libertas perfundet omnia lucet
“DSC” (DTA) WITH HYDROSTATIC PRESSURE
(J.L. Tamarit, Universitat Politècnica de Catalunya)
Cells
O-ring
Capillary
Screw
Metallic O-ring
T: 100 – 500 K
p: 0 – 3kbar (0.3 GPa)
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Libertas perfundet omnia lucet
Examples
00.8kbar1kbar1.2kbar1.4kbar1.7kbar2.1kbar
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Libertas perfundet omnia lucet
OTHER DTA WITH HYDROSTATIC PRESSURE
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Libertas perfundet omnia lucet
DSC WITH UNIAXIAL (TENSILE) STRESS
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Libertas perfundet omnia lucet
DSC WITH UNIAXIAL (COMPRESSIVE) STRESS
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Libertas perfundet omnia lucet
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Libertas perfundet omnia lucet
SUMMARY
DSC calorimetry under field:
Accurate determination of ∆S at caloric effects
Reproducibility of a caloric effect
Future target:
DSC calorimetry under fieldS(more than one applied field)
MULTICALORICEFFECTS
.............
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Libertas perfundet omnia lucet
COLLABORATORS
Enric Stern-Taulats, Rubén Millán-Solsona, Antoni PlanesUniversitat de Barcelona.
Pol Lloveras, Maria Barrio, Josep-Lluís TamaritUniversitat Politècnica de Catalunya.