Estimate of the Crystallization Kinetics in Stoichiometry Compositions Films of Ge:Sb:Te

• 作者: Carlos Virgilio Rivera Rodríguez Eduardo Morales Sanchez Evgen Prokhorov Gerardo Trapaga Martínez Jesús González Hernández Juan Mu?oz Salda?a
• 来源期刊: 表面工程材料与先进技术期刊(英文)
• 学科: 化学
• 关键词: CRYSTALLIZATION Ge:Sb:Te JMAK Model
• 年，卷（期）: 2012,（1）
• 页码范围: 44-46
• 页数: 3页
• 分类号: O6

摘要

The aim of this work is to compare the isothermal crystallization kinetic in the films along GeTe-Sb2Te3 line with composition Ge2Sb2Te5, Ge1Sb2Te4 Ge1Sb4Te7 and Ge4Sb1Te5 using mainly Johnson–Mehl–Avrami-Kolmogorov (JMAK) model. Results obtained have shown different crystallization mechanism in the investigated films. In Ge2Sb2Te5 and Ge1Sb2Te4 films the analysis of the kinetic results (Avrani coefficient) showed that at the beginning of crystallization a metastable phase appeared with the Ge1Sb4Te7 composition, this is followed by the nucleation and growth of the stable fcc phase up to full crystallization. In contrast Ge4Sb1Te5 and Ge1Sb4Te7 films show diffusion control growing from small dimension grains with decreasing nucleation rate.