Simultaneous calorimetric and quick-EXAFS measurements to study the crystallization process in phase-change materials.
A Calvet-type differential scanning calorimeter has been implemented on a synchrotron beamline devoted to X-ray absorption spectroscopy. As a case study, the complex crystallization process in amorphous Ge(15)Sb(85) phase-change material is followed by simultaneous calorimetric and quick-EXAFS measurements. A first crystallization at 514(1) K is related to the crystallization of an Sb-rich phase accompanied by segregation of Ge atoms. Upon further heating, the as-formed amorphous Ge regions crystallize at 604(1) K. A quantitative analysis of the latent heat allows a Ge(11)Sb(89) stoichiometry to be proposed for the first crystallized phase.
I. Physikalisches Institut der RWTH, Lehrstuhl für Physik neuer Materialien, 52056 Aachen, Germany.
Peter
P
Zalden
Giuliana
G
Aquilanti
Carmello
C
Prestipino
Olivier
O
Mathon
Bérangère
B
André
Matthias
M
Wuttig
Marie Vanessa
MV
Coulet