Amorphous states of two-dimensional(2D)materials frequently exhibit remarkable physical properties that differ significantly from their crystalline counterparts.Typically,metastable amorphous states can be achieved th...Amorphous states of two-dimensional(2D)materials frequently exhibit remarkable physical properties that differ significantly from their crystalline counterparts.Typically,metastable amorphous states can be achieved through rapid quenching from high temperatures.However,the heating process is detrimental to the structural integrity of 2D materials.In this study,we successfully utilized pressure as an external stimulus to induce an amorphous state in layered crystal SiP.Comprehensive experimental and theoretical investigations revealed metallization in the high-pressure amorphous phase of SiP.The recovered samples were characterized using x-ray diffraction,Raman spectroscopy,high-resolution transmission electron microscopy,and selected area electron diffraction.The results indicate that the metallic amorphous SiP obtained under extreme conditions can be stabilized at ambient conditions.These findings provide a viable pathway for inducing metastable phases in 2D materials and offer new insights into the design and development of advanced electronic devices.展开更多
The high-pressure structural,vibrational and electrical properties for realgar were investigated by in-situ Raman scattering and electrical conductivity experiments combined with first-principle calculations up to~30....The high-pressure structural,vibrational and electrical properties for realgar were investigated by in-situ Raman scattering and electrical conductivity experiments combined with first-principle calculations up to~30.8 GPa.It was verified that realgar underwent an isostructural phase transition at~6.3 GPa and a metallization at a higher pressure of~23.5 GPa.The isostructural phase transition was well evidenced by the obvious variations of Raman peaks,electrical conductivity,crystal parameters and the As–S bond length.The phase transition of metallization was in closely associated with the closure of bandgap rather than caused by the structural phase transition.And furthermore,the metallic realgar exhibited a relatively low compressibility with the unit cell volume V_(0)=718.1.4Å^(3)and bulk modulus B_(0)=36.1 GPa.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant No.42150102)the Sichuan Science and Technology Program(Grant No.2023NSFSC1910)。
文摘Amorphous states of two-dimensional(2D)materials frequently exhibit remarkable physical properties that differ significantly from their crystalline counterparts.Typically,metastable amorphous states can be achieved through rapid quenching from high temperatures.However,the heating process is detrimental to the structural integrity of 2D materials.In this study,we successfully utilized pressure as an external stimulus to induce an amorphous state in layered crystal SiP.Comprehensive experimental and theoretical investigations revealed metallization in the high-pressure amorphous phase of SiP.The recovered samples were characterized using x-ray diffraction,Raman spectroscopy,high-resolution transmission electron microscopy,and selected area electron diffraction.The results indicate that the metallic amorphous SiP obtained under extreme conditions can be stabilized at ambient conditions.These findings provide a viable pathway for inducing metastable phases in 2D materials and offer new insights into the design and development of advanced electronic devices.
基金the strategic priority Research Program(B)of the Chinese Academy of Sciences(Grant No.18010401)Key Research Program of Frontier Sciences of CAS(Grant No.QYZDB-SSW-DQC009)+3 种基金Hundred Talents Program of CAS,NSF of China(Grant Nos.41774099 and 41772042)Youth Innovation Promotion Association of CAS(Grant No.2019390)Special Fund of the West Light Foundation of CASthe Supercomputer Center of Fujian Institute of Research on the Structure of Matter(FJIRSM)is acknowledged.
文摘The high-pressure structural,vibrational and electrical properties for realgar were investigated by in-situ Raman scattering and electrical conductivity experiments combined with first-principle calculations up to~30.8 GPa.It was verified that realgar underwent an isostructural phase transition at~6.3 GPa and a metallization at a higher pressure of~23.5 GPa.The isostructural phase transition was well evidenced by the obvious variations of Raman peaks,electrical conductivity,crystal parameters and the As–S bond length.The phase transition of metallization was in closely associated with the closure of bandgap rather than caused by the structural phase transition.And furthermore,the metallic realgar exhibited a relatively low compressibility with the unit cell volume V_(0)=718.1.4Å^(3)and bulk modulus B_(0)=36.1 GPa.
