Room‐Temperature Wide‐Gap Inorganic Materials with Excellent Plasticity

Abstract

In general, inorganic non‐metallic materials exhibit brittleness, and achieving plasticity in wide‐gap semiconductors or dielectrics poses an even greater challenge. Historically, silver halides have been suggested to be ductile; however, their deformability under different load modes has not been well demonstrated, and the underlying mechanisms are not fully understood. In this study, the authors demonstrate the excellent plasticity of AgCl and AgBr polycrystals at room temperature under tension, bending, compression, and roller pressing. In particular, the rolling reduction rate of AgCl/AgBr exceeds 97%, corresponding to the plastic extensibility from 3600% to 4200%. The metal‐like plasticity and multiple slip systems are attributed to the ionic features, specifically the Coulombic nature of the Ag‐Cl/Br interactions, and the appreciable polarization of the anions. Such less localized diffuse bonding can be readily switched upon atomic gliding, thus ensuring slip without cleavage. This study contributes to the advancement of the understanding and development of wide‐gap plastically deformable inorganic materials for applications in flexible, shape‐conformable high‐power electronics and dielectrics.

Plastic Mg3(Sb,Bi)2-based thermoelectric compounds with enhanced texture via cold-deformation

“…1(b)). 30 Note that no fracture occurs during the indentation method measurement process, indicating good fracture toughness of Mg 3 (Sb,Bi) 2 -based compounds. To quantitatively characterize their ductility, we calculated the K / G ratio which is used as an indicator to judge whether the materials fall in the category of ductility or brittleness (If K / G > 1.75, it is ductile; otherwise, it is brittle).…”

High‐Entropy Cubic Pseudo‐Ternary Ag2(S, Se, Te) Materials With Excellent Ductility and Thermoelectric Performance

“…Ag 2 S 1/3 Se 1/3 Te 1/3 and Ag 1.98 S 1/3 Se 1/3 Te 1/3 exhibit large tensile fracture strains of ≈97% and 60%, respectively, being remarkably large values for inorganic nonmetallic materials. [ 39 ] The section shrinkage rate after fracture is as large as 49% for Ag 2 S 1/3 Se 1/3 Te 1/3 . The pronounced plastic deformability is also demonstrated by Video S1 (Supporting Information) and the photos before and after tension.…”

“…See the raw data in Figure S2 and Table S1 (Supporting Information); some data are taken from refs. [8–10,22,24–26,31,37–41] e) XRD patterns of Ag 2‐ x S 1/3 Se 1/3 Te 1/3 materials ( x = 0, 0.005, 0.01, 0.02, 0.03, and 0.04). f) HRTEM image and g) SAED pattern of Ag 2 S 1/3 Se 1/3 Te 1/3 .…”