Heat Properties of Solid

Specific heat

Entropy

Free Energy

Perovskite structure

C is extensive properties

NaCu2O2

Spin Liquid

Dy2TiO7

2-levels splitting (Schottky anomaly)

Maximum point

Phonon Specific heat (Einstein model)

Phonon Specific heat (Debye model)

Debye model @low T

Electronic Specific heat

Total differential entropy of magnetic system

For the adiabatic process

and constant pressure

MAGNETOCALORIC EFFECT

MAGNETIC ENTROPY

From the specific heat measurement

From the magnetization measurement

Maxwell relation

( ) ( )

+

H HM dHHTMdHHTTMTS 0 0 ,,1

PEFORMANCE OF MAGNETOCALORIC PROPERTIES

SOME MAGNETOCALORIC MATERIALS

SOME MAGNETOCALORIC MATERIALS

RECENT MAGNETOCALORIC MATERIALS

COMPARISION BETWEEN MCE

RECENT MAGNETOCALORIC MATERIALS

MAGNETIC REFRIGERATION

ERICSSON CYCLE

BRYTON CYCLE

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