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Synthesizing materials under negative pressure is challenging. This study introduces a novel heterostructural alloying method to create stable negative-pressure polymorphs with unique electronic and piezoelectric properties.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Crystallography

Background:

  • Polymorphism, the ability of a material to exist in multiple crystal structures, is common.
  • Materials are typically synthesized under positive pressure, but negative pressure synthesis is difficult.
  • Heterostructural alloying offers a potential route to overcome negative pressure synthesis challenges.

Purpose of the Study:

  • To develop a general method for synthesizing negative-pressure polymorphs.
  • To investigate the properties of materials synthesized under negative pressure.
  • To demonstrate the feasibility of heterostructural alloying for creating novel material structures.

Main Methods:

  • Theoretical calculations to assess energy costs for mixing structures.
  • Proof-of-concept experiments involving the synthesis of manganese selenide-telluride (Mn(Se,Te)) alloys.
  • Characterization of the synthesized alloy's crystal structure and properties.

Main Results:

  • Theoretical calculations indicated lower energy costs for mixing low-density structures.
  • Successful synthesis of a low-density wurtzite structure Mn(Se,Te) alloy via heterostructural alloying.
  • The Mn(Se,Te) polymorph exhibited significantly lower electron effective mass and a novel piezoelectric response.

Conclusions:

  • Heterostructural alloying is an effective strategy for synthesizing negative-pressure polymorphs.
  • This approach enables the creation of materials with desirable properties not found in parent compounds.
  • The developed method has broad applicability for discovering new materials.