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 x Te90-x As10 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.

中文翻译：

---

结合超快速量热法和电子显微镜：SeTeAs合金中的可逆相变。

使用互补的超快速差示扫描量热法和透射电子显微镜技术研究了可逆的无定形晶体相变，这些技术一起可以确定大量的热和结构性质。之所以对SeTe（As）系统进行研究，是因为这些基于硫族化物的材料具有良好的性能，可作为相变存储材料和光学系统使用。使用量热法，我们发现添加了10 at。对于SeTe合金，％提高了其玻璃形成能力，在降低临界淬火速率的同时提高了玻璃化转变温度和结晶温度。利用电子显微镜和元素图谱对Se x Te90-x As10进行异位研究，发现了两相层状偏析机理，其中形成了三角形的SeTe相和非晶态的富As相。这些发现证明了结合热分析和结构分析技术的力量。