Anomalous mechanical materials squeezing three-dimensional volume compressibility into one dimension

Xingxing Jiang,Shiliu Peng,Liyuan Dong,Maxim S Molokeev,Yanchun Li,Zhichao Dong,Xiaodong Li,Wei Li,Zheshuai Lin,Chuan Tian,Lei Kang,Naizheng Wang

doi:10.1038/s41467-020-19219-5

Abstract

Anomalous mechanical materials, with counterintuitive stress-strain responding behaviors, have emerged as novel type of functional materials with highly enhanced performances. Here we demonstrate that the materials with coexisting negative, zero and positive linear compressibilities can squeeze three-dimensional volume compressibility into one dimension, and provide a general and effective way to precisely stabilize the transmission processes under high pressure. We propose a “corrugated-graphite-like” structural model and discover lithium metaborate (LiBO2) to be the first material with such a mechanical behavior. The capability to keep the flux density stability under pressure in LiBO2 is at least two orders higher than that in conventional materials. Our study opens a way to the design and search of ultrastable transmission materials under extreme conditions.

Highlights

Anomalous mechanical materials, with counterintuitive stress-strain responding behaviors, have emerged as novel type of functional materials with highly enhanced performances
As many physical properties are tightly related to the transmission processes of electrons, photons, and phonons[13], the transmission stability under pressure is essential to improve the performances of functional materials in extreme and complex environments, but the relevant studies in anomalous mechanical materials have been elusive
“directionality” to subtly manipulate physical properties. This mechanical matching condition is impossible to be realized in conventional materials which are shrinked along arbitrary axis under pressure, since the volume compressibility is always larger than the linear compressibility along any direction in these materials

Summary

Introduction

With counterintuitive stress-strain responding behaviors, have emerged as novel type of functional materials with highly enhanced performances. In order to stabilize the transmission processes under pressure, the cross section, normally contracted with the increase of ambient pressure, needs to be kept as constant as possible to resist the influence of pressure fluctuation ΔP To this end, a most effective approach is to make the ing ldinireeacrtioconm^l perxeascsitblyilietyqu(aαll. The “vectorization” would endow volume compressibility with the “directionality” to subtly manipulate physical properties This mechanical matching condition is impossible to be realized in conventional materials which are shrinked along arbitrary axis under pressure (i.e., exhibiting positive linear compressibility, or PLC, behavior in arbitrary direction), since the volume compressibility is always larger than the linear compressibility along any direction in these materials. This problem can be solved in anomalous mechanical materials with negative linear compressibility (NLC) and/or zero linear compressibility (ZLC)

Methods

Results

Conclusion