title: Crystal structure of polymeric carbon nitride and the determination of its process-temperature-induced modifications.
abstract: Based on the arrangement of two-dimensional 'melon', we construct a unit cell for polymeric carbon nitride (PCN) synthesized via thermal polycondensation, whose theoretical diffraction powder pattern includes all major features measured in x-ray diffraction. With the help of this unit cell, we describe the process-temperature-induced crystallographic changes in PCN that occur within a temperature interval between 510 and 610 °C. We also discuss further potential modifications of the unit cell for PCN. It is found that both triazine- and heptazine-based g-C3N4 can only account for minor phases within the investigated synthesis products.
authors.affiliation: Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, D-14109 Berlin, Germany. Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, D-12489 Berlin, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Tyborski
authors.forename: C
authors.initials: C
authors.lastname: Merschjann
authors.forename: S
authors.initials: S
authors.lastname: Orthmann
authors.forename: F
authors.initials: F
authors.lastname: Yang
authors.forename: M-Ch
authors.initials: MC
authors.lastname: Lux-Steiner
authors.forename: Th
authors.initials: T
authors.lastname: Schedel-Niedrig