Multistates and Polyamorphism in Phase-Change K2Sb8Se13

Saiful M. Islam, Lintao Peng, Li Zeng, Christos D Malliakas, Duck Young Chung, D. Bruce Buchholz, Thomas Chasapis, Ran Li, Konstantinos Chrissafis, Julia E. Medvedeva, Giancarlo G. Trimarchi, Matthew A Grayson, Tobin Jay Marks, Michael J Bedzyk, R P H Chang, Vinayak P Dravid, Mercouri Kanatzidis*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

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 languageEnglish (US)
Pages (from-to)9261-9268
Number of pages8
JournalJournal of the American Chemical Society
Volume140
Issue number29
DOIs
StatePublished - Jul 25 2018

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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