Negative-pressure polymorphs made by heterostructural alloying.

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.

journal_name

Sci Adv

journal_title

Science advances

authors

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

doi

10.1126/sciadv.aaq1442

subject

Has Abstract

pub_date

2018-04-20 00:00:00

pages

eaaq1442

issue

4

issn

2375-2548

pii

aaq1442

journal_volume

4

pub_type

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