Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 9261-9268 |
| Number of pages | 8 |
| Journal | Journal of the American Chemical Society |
| Volume | 140 |
| Issue number | 29 |
| DOIs | |
| Publication status | Published - Jul 25 2018 |
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ASJC Scopus subject areas
- Catalysis
- Chemistry(all)
- Biochemistry
- Colloid and Surface Chemistry
Cite this
Multistates and Polyamorphism in Phase-Change K2Sb8Se13 . / Islam, Saiful M.; Peng, Lintao; Zeng, Li; Malliakas, Christos D.; Chung, Duck Young; Buchholz, D. Bruce; Chasapis, Thomas; Li, Ran; Chrissafis, Konstantinos; Medvedeva, Julia E.; Trimarchi, Giancarlo G.; Grayson, Matthew; Marks, Tobin J; Bedzyk, Michael J.; Chang, Robert P. H.; Dravid, Vinayak P.; Kanatzidis, Mercouri G.
In: Journal of the American Chemical Society, Vol. 140, No. 29, 25.07.2018, p. 9261-9268.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Multistates and Polyamorphism in Phase-Change K2Sb8Se13
AU - Islam, Saiful M.
AU - Peng, Lintao
AU - Zeng, Li
AU - Malliakas, Christos D.
AU - Chung, Duck Young
AU - Buchholz, D. Bruce
AU - Chasapis, Thomas
AU - Li, Ran
AU - Chrissafis, Konstantinos
AU - Medvedeva, Julia E.
AU - Trimarchi, Giancarlo G.
AU - Grayson, Matthew
AU - Marks, Tobin J
AU - Bedzyk, Michael J.
AU - Chang, Robert P. H.
AU - Dravid, Vinayak P.
AU - Kanatzidis, Mercouri G
PY - 2018/7/25
Y1 - 2018/7/25
N2 - 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.
AB - 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.
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U2 - 10.1021/jacs.8b05542
DO - 10.1021/jacs.8b05542
M3 - Article
VL - 140
SP - 9261
EP - 9268
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
SN - 0002-7863
IS - 29
ER -