Vermeulen Paul A, Calon Joost, Ten Brink Gert H, Kooi Bart J
Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, Groningen 9747 AG, The Netherlands.
Cryst Growth Des. 2018 Jun 6;18(6):3668-3673. doi: 10.1021/acs.cgd.8b00450. Epub 2018 May 14.
Reversible amorphous-crystalline phase transitions are studied using complementary ultrafast differential scanning calorimetry and transmission electron microscopy techniques, which together allow a wealth of thermal and structural properties to be determined. The SeTe(As) system is investigated because these chalcogenide based materials have favorable properties as a phase-change memory material and in optical systems. Using calorimetry, we find that the addition of 10 at. % As to SeTe alloys strongly increases their glass forming ability, increasing both glass transition and crystallization temperatures while reducing critical quench rate. Ex situ investigation of Se Te As using electron microscopy and elemental mapping reveals a two-phase lamellar segregation mechanism, where a trigonal SeTe-phase and an amorphous As-rich phase are formed. These findings demonstrate the power of combining thermal and structural analysis techniques.
利用互补的超快差示扫描量热法和透射电子显微镜技术研究了可逆的非晶-晶相转变，这两种技术结合起来能够确定大量的热学和结构性质。对SeTe(As)体系进行了研究，因为这些基于硫族化物的材料作为相变存储材料和在光学系统中具有良好的性能。通过量热法，我们发现向SeTe合金中添加10原子%的As会显著提高其玻璃形成能力，同时提高玻璃化转变温度和结晶温度，降低临界淬火速率。利用电子显微镜和元素映射对Se-Te-As进行的非原位研究揭示了一种两相层状偏析机制，其中形成了三角SeTe相和富含As的非晶相。这些发现证明了结合热分析和结构分析技术的强大作用。
