Multi-States and Polyamorphism in Phase Change K2Sb8Se13,Journal of the American Chemical Society

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Multi-States and Polyamorphism in Phase Change K2Sb8Se13
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2018-06-29 , DOI: 10.1021/jacs.8b05542
Saiful M. Islam ₁ , Lintao Peng ₂ , Li Zeng ₂ , Christos D. Malliakas ₁ , Duck Young Chung ₃ , D. Bruce Buchholz ₄ , Thomas Chasapis ₁ , Ran Li ₄ , Konstantinos Chrissafis ₅ , Julia E. Medvedeva ₆ , Giancarlo G. Trimarchi ₇ , Matthew Grayson _{2,

8} , Tobin J. Marks _{1,

2,

4} , Michael J. Bedzyk _{2,

4,

7} , Robert P. H. Chang ₄ , Vinayak P. Dravid ₄ , Mercouri G. Kanatzidis _{1,

3}

Affiliation

The phase-change (PC) materials in the majority of optical data storage media in use today exhibit a fast, reversible crystal → amorphous phase transition that allows them to be switched between on (1) and off (0) binary states. Solid-state inorganic materials with this property are relatively common, but those exhibiting an amorphous → amorphous transition called polyamorphism are exceptionally rare. K2Sb8Se13 (KSS) reported here is the first example of a material that has both amorphous → amorphous polyamorphic transition and amorphous → crystal transition at easily accessible temperatures (227 and 263 °C, respectively). The transitions are associated with the atomic coordinative preferences of the atoms, and all three states of K2Sb8Se13 are stable in air at 25 °C and 1 atm. All three states of K2Sb8Se13 exhibit distinct optical bandgaps, Eg = 1.25, 1.0, and 0.74 eV, for the amorphous-II, amorphous-I, and crystalline versions, respectively. The room-temperature electrical conductivity increases by more than 2 orders of magnitude from amorphous-I to -II and by another 2 orders of magnitude from amorphous-II to the crystalline state. This extraordinary behavior suggests that a new class of materials exist which could provide multistate level systems to enable higher-order computing logic circuits, reconfigurable logic devices, and optical switches.

中文翻译：

相变 K2Sb8Se13 的多态和多态性

目前使用的大多数光学数据存储介质中的相变 (PC) 材料表现出快速、可逆的晶体→非晶相变，允许它们在开 (1) 和关 (0) 二元状态之间切换。具有这种特性的固态无机材料相对常见，但那些表现出称为多晶现象的无定形→无定形转变的材料极为罕见。此处报道的 K2Sb8Se13 (KSS) 是第一个在易于达到的温度（分别为 227 和 263 °C）下具有非晶→非晶多晶转变和非晶→晶体转变的材料的例子。跃迁与原子的原子配位偏好有关，并且 K2Sb8Se13 的所有三种状态在 25 °C 和 1 atm 的空气中都是稳定的。K2Sb8Se13 的所有三种状态都表现出不同的光学带隙，Eg = 1.25、1.0 和 0.74 eV，分别用于非晶 II、非晶 I 和结晶版本。室温电导率从非晶-I 到-II 增加了2 个数量级以上，从非晶-II 到晶态又增加了2 个数量级。这种非凡的行为表明存在一类新材料，它可以提供多态级系统，以实现更高阶的计算逻辑电路、可重新配置的逻辑器件和光开关。

更新日期：2018-06-29

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