Negative-pressure polymorphs made by heterostructural alloying

Sebastian Siol, Aaron Holder, James Steffes, Laura T. Schelhas, Kevin H. Stone, Lauren Garten, John D. Perkins, Philip A. Parilla, Michael F. Toney, Bryan D. Huey, William Tumas, Stephan Lany, Andriy Zakutayev

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The ability of a material to adopt multiple structures, known as polymorphism, is a fascinating natural phenomenon. Various polymorphs with unusual properties are routinely synthesized by compression under positive pressure. However, changing a material’s structure by applying tension under negative pressure is much more difficult. We show how negative-pressure polymorphs can be synthesized by mixing materials with different crystal structures—a general approach that should be applicable to many materials. Theoretical calculations suggest that it costs less energy to mix low-density structures than high-density structures, due to less competition for space between the atoms. Proof-of-concept experiments confirm that mixing two different high-density forms of MnSe and MnTe stabilizes a Mn(Se,Te) alloy with a low-density wurtzite structure. This Mn(Se,Te) negative-pressure polymorph has 2× to 4× lower electron effective mass compared to MnSe and MnTe parent compounds and has a piezoelectric response that none of the parent compounds have. This example shows how heterostructural alloying can lead to negative-pressure polymorphs with useful properties—materials that are otherwise nearly impossible to make.

Original languageEnglish
Article numbereaaq1442
JournalScience advances
Volume4
Issue number4
DOIs
Publication statusPublished - Apr 20 2018

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Polymorphism
Alloying
Compaction
Atoms
Crystals
Electrons
Costs
Experiments

ASJC Scopus subject areas

  • General

Cite this

Siol, S., Holder, A., Steffes, J., Schelhas, L. T., Stone, K. H., Garten, L., ... Zakutayev, A. (2018). Negative-pressure polymorphs made by heterostructural alloying. Science advances, 4(4), [eaaq1442]. https://doi.org/10.1126/sciadv.aaq1442

Negative-pressure polymorphs made by heterostructural alloying. / Siol, Sebastian; Holder, Aaron; Steffes, James; Schelhas, Laura T.; Stone, Kevin H.; Garten, Lauren; Perkins, John D.; Parilla, Philip A.; Toney, Michael F.; Huey, Bryan D.; Tumas, William; Lany, Stephan; Zakutayev, Andriy.

In: Science advances, Vol. 4, No. 4, eaaq1442, 20.04.2018.

Research output: Contribution to journalArticle

Siol, S, Holder, A, Steffes, J, Schelhas, LT, Stone, KH, Garten, L, Perkins, JD, Parilla, PA, Toney, MF, Huey, BD, Tumas, W, Lany, S & Zakutayev, A 2018, 'Negative-pressure polymorphs made by heterostructural alloying', Science advances, vol. 4, no. 4, eaaq1442. https://doi.org/10.1126/sciadv.aaq1442
Siol S, Holder A, Steffes J, Schelhas LT, Stone KH, Garten L et al. Negative-pressure polymorphs made by heterostructural alloying. Science advances. 2018 Apr 20;4(4). eaaq1442. https://doi.org/10.1126/sciadv.aaq1442
Siol, Sebastian ; Holder, Aaron ; Steffes, James ; Schelhas, Laura T. ; Stone, Kevin H. ; Garten, Lauren ; Perkins, John D. ; Parilla, Philip A. ; Toney, Michael F. ; Huey, Bryan D. ; Tumas, William ; Lany, Stephan ; Zakutayev, Andriy. / Negative-pressure polymorphs made by heterostructural alloying. In: Science advances. 2018 ; Vol. 4, No. 4.
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