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  • 材料學院饒峰特聘教授在Science發表論文評述相變存儲材料的液-液轉變機制

    發布時間:2019-06-14

    饒峰教授于2019614日在Science發表論文,題為Catching structural transitions in liquids. Rao et al., Science 364, 1032–1033 (2019).

    論文鏈接:https://science.sciencemag.org/content/364/6445/1032

    相變隨機動態存儲器(Phase-change random-access memoryPCRAM)是最具潛力的新一代非易失性存儲器,在革新現有馮諾依曼計算體系架構、實現人工智能神經元計算方面已成為業界、學界的研究熱點。PCRAM最顯著的特性在于高操作速度且數據非易失性:高溫(600-700 K)下,相變存儲材料可實現納秒乃至亞納秒級高速晶化;而在室溫(300 K)下,非晶態數據可實現十年以上的穩定保持。這說明相變材料的過冷液相(supercooled liquid phase)在玻璃轉變溫度Tg與熔點Tm之間存在著巨大的動力學變化(kinetics change),然而這種動力學反差的微觀結構起源卻始終是個謎。這是因為,相變材料快速的(納秒-亞納秒)晶化特性致使探測其過冷液相中的結構轉變(Liquid-liquid phase transitionLLPT)變得極具挑戰,需采用超快(飛秒級)時間分辨手段方能在晶化發生之前捕捉結構信息。

    通過采用飛秒級同步輻射硬X射線衍射技術,Zalden等人發現AgInSbTeGe15Sb85兩種典型的相變材料的過冷液相中存在一種LLPT,即短程序上存在Peierls distortion增大(原立方晶格八面體中六個較均一的化學鍵分裂為三長三短鍵),以及中程序上的相對應的化學鍵的長短調制。過冷液相在淬火過程中,經歷此LLPT后,原子間電子局域化程度增強,致使液相體系更加粘滯(原子遷移受阻):即LLPT之前高溫的脆性(fragile)液相轉變為LLPT之后低溫的剛性(strong)液相,證實此LLPT正是過冷液相動力學轉變的結構誘因,發生了Fragile-to-strong crossover。這一發現揭示了相變存儲材料高溫高速晶化且低溫數據非易失特性的物理本質,為設計性能更為優良的新型相變材料提供了強大的實驗檢驗武器;有助于加快發展基于PCRAM的高性能通用型存儲器與類腦神經元計算器件。

    該工作獲得了國家自然科學基金優秀青年基金項目、廣東省基礎研究重大項目、深圳市基礎研究布局與自由探索項目的資助。深圳大學材料學院為本論文第一通訊單位;材料學院饒峰教授為本論文第一、通訊作者,西安交通大學張偉教授與美國約翰霍普金斯大學馬恩教授為共同通訊作者。

    饒峰教授關于高性能緩存型超快(亞納秒級)相變存儲材料ScSbTe的研究工作發表在201711Science上:Reducing the stochasticity of crystal nucleation to enable sub-nanosecond memory writing. Rao et al., Science 358, 1423–1427 (2017). ScSbTe材料的超快(亞納秒級)晶化與非易失性特性同樣得益于潛在LLPT誘發的動力學Fragile-to-strong crossover

     

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