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Title: Experimental evidence of new tetragonal polymorphs of silicon formed through ultrafast laser-induced confined microexplosion

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms8555· OSTI ID:1265388
 [1];  [2];  [3];  [4];  [1];  [4];  [1]
  1. Australian National Univ., Canberra, ACT (Australia). Research School of Physics and Engineering
  2. Australian National Univ., Canberra, ACT (Australia). Electronic Materials Engineering; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical and Engineering Materials Division
  3. Univ. College London (UCL), London (United Kingdom). Dept. of Physics and Astronomy
  4. Australian National Univ., Canberra, ACT (Australia). Electronic Materials Engineering

Ordinary materials can transform into novel phases with new crystal structures at extraordinary high pressure and temperature applied under both equilibrium and non-equilibrium conditions 1-6. The recently developed method of ultra-short laser-induced confined microexplosions 7-9 extends the range of possible new phases by initiating a highly non-equilibrium plasma state deep inside a bulk material 7-12. Ultra-high quenching rates can help to overcome kinetic barriers to the formation of new metastable phases, while the surrounding pristine crystal confines the affected material and preserves it for further study 10-12. Here we demonstrate that ultra-rapid pressure release from a completely disordered plasma state in silicon produces several new metastable end phases quenched to ambient conditions. Their structure is determined from comparison to an ab initio random structure search which revealed six new energetically competitive potential phases, four tetragonal and two monoclinic ones. We show the presence of bt8 and st12, which have been predicted theoretically previously 13-15, but have not been observed in nature or in laboratory experiments. Additionally, the presence of the as yet unidentified silicon phase, Si-VIII and two of our other predicted tetragonal phases are highly likely within laser-affected zones. These findings pave the way for new materials with novel and exotic properties.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725; DP120102980; FA9550-12-1-0482; EP/G007489/2
OSTI ID:
1265388
Journal Information:
Nature Communications, Vol. 6; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 106 works
Citation information provided by
Web of Science

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Cited By (24)

Extracting Crystal Chemistry from Amorphous Carbon Structures journal March 2017
Simulations of laser-induced dynamics in free-standing thin silicon films journal September 2017
Structure prediction drives materials discovery journal April 2019
Femtosecond diffraction studies of solid and liquid phase changes in shock-compressed bismuth journal November 2018
Novel silicon phases and nanostructures for solar energy conversion journal December 2016
First-principles prediction of two hexagonal silicon crystals as potential absorbing layer materials for solar-cell application journal October 2018
Recovery of metastable dense Bi synthesized by shock compression journal March 2019
A new series of two-dimensional silicon crystals with versatile electronic properties journal February 2018
Deformed octagon-hexagon-square structure of group-IV and group-V elements and III-V compounds journal September 2019
Ultrafast destructuring of laser-irradiated tungsten: Thermal or nonthermal process journal December 2016
Polymorphism in elemental silicon: Probabilistic interpretation of the realizability of metastable structures journal November 2017
Stochastic generation of complex crystal structures combining group and graph theory with application to carbon journal January 2018
Complex Low Energy Tetrahedral Polymorphs of Group IV Elements from First Principles journal October 2018
Positive- and negative-tone structuring of crystalline silicon by laser-assisted chemical etching journal January 2019
Temporal Airy pulses for controlled high aspect ratio nanomachining of dielectrics journal January 2016
Fundamentals of ultrafast laser–material interaction journal December 2016
Extreme Energy Density Confined Inside a Transparent Crystal: Status and Perspectives of Solid-Plasma-Solid Transformations journal July 2018
Extracting Crystal Chemistry from Amorphous Carbon Structures text January 2017
Structure Prediction Drives Materials Discovery text January 2019
Stochastic generation of complex crystal structures combining group and graph theory with application to carbon text January 2018
Complex Low Energy Tetrahedral Polymorphs of Group IV Elements from First Principles. text January 2018
Comparing molecules and solids across structural and alchemical space text January 2016
Properties of the exotic metastable ST12 germanium allotrope journal January 2017
Extreme Energy Density Confined inside a Transparent Crystal: Status and Perspectives of Solid-Plasma-Solid Transformations journal July 2018

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