期刊
JOURNAL OF SYNCHROTRON RADIATION
卷 19, 期 -, 页码 806-813出版社
WILEY-BLACKWELL
DOI: 10.1107/S090904951202612X
关键词
phase-change materials; phase separation; crystallization; amorphous
资金
- ESRF [MI980, HS980]
- PHC-PROCOPE [25157ZB, 50749076]
- Deutsche Forschungsgemeinschaft (DFG) [SFB 917]
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 Ge15Sb85 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 Ge11Sb89 stoichiometry to be proposed for the first crystallized phase.
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