TY - GEN
T1 - Two-stage crystallization process in Ge2Sb2Te5 alloys
AU - Morales-Sánchez, E.
AU - Hernández-Landaverde, M. A.
AU - Prokhorov, E.
AU - Trapaga, G.
AU - González-Hernández, J.
PY - 2008
Y1 - 2008
N2 - The aim of this work is to investigate the amorphous-to-crystalline phase transformation process in Ge2Sb2Te5 ternary alloys. The experiments were carried out using impedance and X-ray diffraction measurements. The results have shown that the crystallization process in an amorphous Ge2Sb2Te5 alloy starts from nuclei, which appear below Tc and which were identified as the crystalline Ge 1Sb4Te7. As the temperature increases above Tc these nuclei were transformed into fcc-Ge2Sb2Te 5 crystals. In order to establish the mechanism of crystallization for this system, the Brugerman effective medium approximation was implemented to analyze nucleation and growth of the two stage involved (i.e., metastable Get Sb4Te7 and stable Ge2Sb2Te 5) through impedance measurements. The results of the simulations demonstrate a close agreement with experimental ones showing that phase transformation in Ge2Sb2Te5 is carried in two steps.
AB - The aim of this work is to investigate the amorphous-to-crystalline phase transformation process in Ge2Sb2Te5 ternary alloys. The experiments were carried out using impedance and X-ray diffraction measurements. The results have shown that the crystallization process in an amorphous Ge2Sb2Te5 alloy starts from nuclei, which appear below Tc and which were identified as the crystalline Ge 1Sb4Te7. As the temperature increases above Tc these nuclei were transformed into fcc-Ge2Sb2Te 5 crystals. In order to establish the mechanism of crystallization for this system, the Brugerman effective medium approximation was implemented to analyze nucleation and growth of the two stage involved (i.e., metastable Get Sb4Te7 and stable Ge2Sb2Te 5) through impedance measurements. The results of the simulations demonstrate a close agreement with experimental ones showing that phase transformation in Ge2Sb2Te5 is carried in two steps.
KW - Amorphous films
KW - Crystallization process
KW - Phase transformation
UR - http://www.scopus.com/inward/record.url?scp=61549090244&partnerID=8YFLogxK
U2 - 10.1109/ICEEE.2008.4723365
DO - 10.1109/ICEEE.2008.4723365
M3 - Contribución a la conferencia
AN - SCOPUS:61549090244
SN - 9781424424993
T3 - 2008 5th International Conference on Electrical Engineering, Computing Science and Automatic Control, CCE 2008
SP - 475
EP - 477
BT - 2008 5th International Conference on Electrical Engineering, Computing Science and Automatic Control, CCE 2008
T2 - 2008 5th International Conference on Electrical Engineering, Computing Science and Automatic Control, CCE 2008
Y2 - 12 November 2008 through 14 November 2008
ER -