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Crystallization mechanism and kinetics of Cr2Ge2Te6 phase change material

Published online by Cambridge University Press:  23 August 2018

S. Hatayama ,
Y. Sutou ,
D. Ando  and
J. Koike
S. Hatayama
Affiliation:
Department of Materials Science, Graduate School of Engineering, Tohoku University, 6-6-11 Aoba-yama, Sendai 980-8579, Japan
Y. Sutou*
Affiliation:
Department of Materials Science, Graduate School of Engineering, Tohoku University, 6-6-11 Aoba-yama, Sendai 980-8579, Japan
D. Ando
Affiliation:
Department of Materials Science, Graduate School of Engineering, Tohoku University, 6-6-11 Aoba-yama, Sendai 980-8579, Japan
J. Koike
Affiliation:
Department of Materials Science, Graduate School of Engineering, Tohoku University, 6-6-11 Aoba-yama, Sendai 980-8579, Japan
*
Address all correspondence to Y. Sutou at ysutou@material.tohoku.ac.jp
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Abstract

The crystallization mechanism and kinetics of Cr2Ge2Te6 (CrGT) films were investigated by differential scanning calorimetry. The average Avrami exponent (na) analysis indicated that CrGT exhibits a growth-dominant crystallization in the range of heating rate (β) of 10–50°C/min. In comparison, Ge2Sb2Te5 (GST) showed a nucleation-dominant crystallization. The na of CrGT was about 3, and was majorly independent of β. The na of GST decreased with an increasing β, which asymptotically approached a value of around 3. The kinetic constant of CrGT was evaluated to be almost the same with that of GST, indicating that CrGT undergoes fast crystallization.

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Type
Research Letters
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MRS Communications , Volume 8 , Issue 3 , September 2018 , pp. 1167 - 1172
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Copyright
Copyright © Materials Research Society 2018 

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