title: Synthesis of diamond-like phase from graphite by ultrafast laser driven dynamical compression.
abstract: Rapid variations of the environmental energy caused by ultrashort laser pulses have induced phase transitions in carbon allotropes, therefore bringing the promise of revealing new carbon phases. Here, by exposing polycrystalline graphite to 25 fs laser pulses at 4 J/cm(2) fluence under standard air atmosphere, we demonstrated the synthesis of translucent micrometer-sized structures carrying diamond-like and onion-like carbon phases. Texturized domains of the diamond phase were also identified. Concerning different synthesized carbon forms, pulse superposition and singularities of the thermodynamical process, we pinpoint the synthesis mechanism by the laser-induced subsequent products energetically evolving to attain the diamond-like phase.
authors.affiliation: Laboratório Nacional de Luz Síncrotron (LNLS), Campinas, São Paulo 13083-970, Brazil.
authors.forename: Francisco C B
authors.initials: FC
authors.lastname: Maia
authors.affiliation: Instituto de Pesquisas Energéticas e Nucleares (IPEN-CNEN/SP), São Paulo 05508-000, Brazil.
authors.forename: Ricardo E
authors.initials: RE
authors.lastname: Samad
authors.affiliation: Laboratório Nacional de Nanotecnologia (LNNano), Campinas, São Paulo 13083-970, Brazil.
authors.forename: Jefferson
authors.initials: J
authors.lastname: Bettini
authors.affiliation: Laboratório Nacional de Luz Síncrotron (LNLS), Campinas, São Paulo 13083-970, Brazil.
authors.forename: Raul O
authors.initials: RO
authors.lastname: Freitas
authors.affiliation: Instituto de Pesquisas Energéticas e Nucleares (IPEN-CNEN/SP), São Paulo 05508-000, Brazil.
authors.forename: Nilson D
authors.initials: ND
authors.lastname: Vieira Junior
authors.affiliation: Laboratório Nacional de Luz Síncrotron (LNLS), Campinas, São Paulo 13083-970, Brazil.
authors.forename: Narcizo M
authors.initials: NM
authors.lastname: Souza-Neto